Federal Withholding: The Employer's Guide
Federal withholding is money you hold in trust, not money you own. The threshold, the W-4 rules, and why an LLC will not protect you if you spend it.
Federal Withholding
The money in your account that was never yours, the threshold that makes a correct pay stub look broken, and the penalty your LLC will not stop
There is money sitting in your business bank account right now that is not yours. It arrived the moment you ran payroll, when you took the federal income tax out of each employee's wages and paid them the rest. This guide explains, from the employer's side, what you must do with that money and what happens if you do not.
The part you took out looks exactly like every other dollar in the account, and it belongs to somebody else. Most explanations of federal withholding skip past that, because they are written for the employee wondering what came out of their check. This one is written for you, and from your side the important fact is not the rate or the tables.
What matters is that you are a custodian. Spend what you are holding and the consequences do not stop at the company. They follow you personally, past your LLC, through bankruptcy, for the full amount. The penalty that does this is one founders running their own payroll almost never know exists until it is being assessed against them.
Along the way you will also see why a correct pay stub can show zero federal tax and still be right, what the W-4 does, and what happens without one. I build FirstHR, which is not a payroll processor and does not deposit anything with the IRS. Your payroll provider does that. This is general information, not tax advice, and an accountant is a cheap purchase here.
What Federal Withholding Is
Federal withholding is the federal income tax you take out of an employee's wages and send to the IRS on their behalf, in installments, across the year.
Read the last sentence again, because it is what separates this from every other line item in your accounts. Your rent is your money going out. Your matching FICA share is your money going out. The federal income tax you withheld is somebody else's money passing through, and the law treats it accordingly.
Payroll Withholding, and the System It Sits Inside
Payroll withholding is the wider practice of taking tax out of wages at source and paying it over, and federal income tax is one component of it. The others are the employee's Social Security and Medicare, and, in most places, state income tax plus whatever local tax applies where the employee lives or works.
The payroll withholding system is what the country uses instead of asking wage earners to settle their income tax in one annual payment. The tax is collected as the money is earned, by the employer, pay period by pay period. That is how an obligation that belongs to your employee ends up being enforced against you.
One boundary before going further: everything below is the federal income tax piece. State withholding is set state by state and the rules diverge considerably, which is a separate question by state and a separate set of registrations.
It Is Not Your Money
Some of the money in a payroll run is yours and some of it never was, and the distinction has teeth.
The three red rows are trust fund taxes. The word is not decorative. Under 26 U.S.C. 7501, tax you withhold from somebody else is held as a special fund in trust for the United States from the moment you withhold it. Mixing it into your operating account with everything else does not change what it is.
That produces a very specific and very dangerous cash flow trap. There is a month where things are tight. The money is sitting there. You think: I will pay the payroll taxes late, catch up next month, everybody does this. And you have just done the single thing this article exists to warn you about.
The Penalty That Follows You Home
The penalty that follows you home is the Trust Fund Recovery Penalty: it can make the people responsible for paying withheld taxes over to the IRS personally liable when they willfully fail to do it. It is the most serious personal financial exposure in small business payroll.
Per the IRS guidance on employment taxes and the Trust Fund Recovery Penalty, a responsible person is anyone with the duty to perform and the power to direct the collecting, accounting, and paying of trust fund taxes. That is a test about actual control, not about titles, and it catches more people than owners.
The same test also protects people. Under the Internal Revenue Manual, at IRM 5.7.3, the IRS does not assess a non-owner employee who acts solely under the dominion and control of others, meaning someone who only carries out decisions other people make. Its own example is a bookkeeper with check-signing authority who has to ask the treasurer which bills to pay.
But the word doing the most work is willfully, and it does not mean what a normal person would assume.
Sit with that one, because it inverts the instinct of every decent employer. In a tight month, you will want to pay your people first. That impulse is admirable and it is, in this specific and narrow context, the thing that creates the personal liability.
The Internal Revenue Manual states the rule without hedging. Per IRM 5.17.7, paying net wages to employees when funds are not available to pay the withholding taxes is a willful failure under section 6672, the provision behind the penalty, and instructions from a supervisor not to pay the taxes do not relieve an otherwise responsible person.
Bankruptcy is the other exit that is not there. Withheld taxes sit in the priority class at 11 U.S.C. 507(a)(8)(C), which covers any tax required to be collected or withheld in whatever capacity. 11 U.S.C. 523(a)(1)(A) then excepts that whole class from discharge, so even a personal bankruptcy generally does not wipe the debt out. Closing the company does not close this.
The Threshold, and the Zero
There is no single dollar threshold for federal tax withholding, even though that is usually the figure employers come looking for. What exists instead is a mechanism, and understanding it explains a pay stub that looks broken.
The mechanism is the standard deduction, the flat amount a filer can subtract from income before any tax is figured, which the withholding tables build in. When payroll calculates what to withhold for a part-time employee earning $300 a week, it effectively projects their annual income, compares it with the point at which any federal income tax is actually due, and correctly concludes that none is. Zero withheld. The pay stub is right.
The weekly grid shows where that edge sits. In IRS Publication 15-T (2026), the standard withholding column for Single or Married Filing Separately reads $0 on every weekly row below $315 of adjusted wages, and $1 on the row that starts there.
Meanwhile Social Security and Medicare came out in full, because they have no starting threshold whatsoever. Not a lower one. None. FICA applies from the first dollar an employee earns, and no wage is too low for it.
The exact wage at which income tax withholding begins depends on the employee's filing status and how often you pay them, which is why nobody can give you a single figure. What you can rely on is the shape of it: income tax has a floor and FICA does not, and those two rules together produce a pay stub that looks like a bug and is not one.
The same answer covers the question asked the other way around: is there a minimum federal tax withholding? There is no minimum amount you are obliged to take out of a given paycheck. You withhold what the W-4 and the tables produce, and when that comes to nothing, nothing is the correct figure. What you may not do is pick a number of your own, or withhold zero because no form has arrived.
Withholding Is Not FICA
Federal income tax withholding and FICA come out of the same paycheck and go to the same agency, and they behave almost nothing alike.
Per IRS Topic 751, the FICA rates withheld from the employee are 6.2 percent for Social Security and 1.45 percent for Medicare, and you pay the same 7.65 percent again out of your own funds. Those rates do not vary from person to person the way income tax does, and nothing on a W-4 moves them.
The only limits on FICA sit at the top of the pay scale. Per Topic 751, Social Security stops once an employee's wages pass $184,500 for 2026, Medicare has no cap, and you withhold an extra 0.9 percent for Medicare on wages above $200,000.
| Federal income tax withholding | FICA | |
|---|---|---|
| What it is | The employee's income tax, prepaid | Social Security and Medicare contributions |
| The rate | Varies by person. From their W-4 and the IRS tables | Fixed. 6.2 percent and 1.45 percent |
| Is there a threshold? | Yes. Below a certain wage, nothing is withheld | No. From the very first dollar |
| Do you match it? | No. Not a cent. It is entirely their tax | Yes. Dollar for dollar, from your own funds |
| Calculated on | Gross minus pre-tax deductions | Gross minus Section 125 deductions such as a health premium. A 401(k) does not reduce it |
| Is it trust fund money? | Yes | The employee's half is. Your matching half is not |
The row about pre-tax deductions is the one that generates questions on the pay stub. A traditional 401(k) contribution reduces the base for income tax and does nothing at all to the FICA base. So an employee who increases their retirement contribution watches their federal withholding fall while their Social Security stays exactly where it was, which looks like an error and is entirely correct.
FIT on the Pay Stub: What the Abbreviation Means
FIT stands for federal income tax, and on a pay stub it is the subject of this whole article under a shorter name. FIT withheld is the amount you deducted from that check and are holding for the IRS. FIT taxable wages is the figure it was calculated from, and it is not the gross.
| What the stub says | What it stands for | What the number actually is |
|---|---|---|
| FIT, FED, FWT, or FITW | Federal income tax withheld | The employee's own income tax, deducted this period and held by you in trust. Varies person to person, driven by their W-4 |
| FIT taxable wages | The wages the income tax was calculated on | Gross pay minus pre-tax deductions such as a traditional 401(k) or a health premium under a Section 125 plan. Lower than gross whenever either exists |
| Gross pay | Everything earned before anything comes out | The starting point for both bases, but not itself either one. A 401(k) contribution comes out of the income tax base only; a Section 125 premium comes out of the FICA base too |
| SS, OASDI, or Fed OASDI/EE | Social Security | 6.2 percent of Social Security wages, from the first dollar, matched by you out of your own funds |
| MED or Fed MED/EE | Medicare | 1.45 percent of Medicare wages, also from the first dollar, also matched by you |
On the stub itself, the gap between FIT taxable wages and gross is where most questions start. A 401(k) contribution opens that gap and leaves the Social Security wages line where it was, so raising a 401(k) deferral pushes the two figures further apart. A Section 125 health premium is the exception: it comes out of both bases, so it lowers the Social Security wages as well.
The other question is a FIT line reading $0.00 while everything else came out normally. That is the threshold doing exactly what it is built to do, not a fault in payroll. The lines that should never read zero are Social Security and Medicare, and if either of those is blank on a stub, something genuinely is wrong.
The W-4 Decides the Amount
Everything about how much you withhold from a given person comes from one form, and your job is to collect it, apply it, and keep it.
The collection is an onboarding problem rather than a payroll problem, and it belongs with the rest of the paperwork you gather before day one.
The last two questions in that list are the ones you cannot answer from memory, and both of them are answered by a single sheet. One row per employee, updated when a form arrives, plus a second tab holding the small number of people whose status expires or has been overridden by the IRS.
| A | B | C | D | E | F | G | H | I | J | K | L | M | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Employee | Start date | W-4 received on | Year printed on the form | Filing status as entered | Step 2 box checked | Step 3 dependent amount | Step 4 entries | Extra withholding per period | Claiming exempt | Where the signed form is stored | Keep until | Notes |
| 2 | Example: A. Novak | 2026-02-02 | 2026-01-28 | 2026 | Single | No | 0 | None | 0 | No | Employee record, tax folder | 2031-02-01 | Signed before the first run. Counted from the 2026 fourth-quarter Form 941, due February 1, 2027 |
| 3 | |||||||||||||
| 4 | |||||||||||||
| 5 | |||||||||||||
| 6 | |||||||||||||
| 7 | |||||||||||||
| 8 | |||||||||||||
| 9 | Note | No form on file yet is still a row. Record the default you are withholding at and the date you last chased the form | |||||||||||
| 10 | Note | Keep for at least four years after filing the fourth-quarter return for the year, and the test is whether you can produce it for one named person on request |
What Employers Must Do With Form W-4
The Form W-4 employer duty list is shorter than most people expect, and the useful part of it is what is not on there. Collect the form, apply the entries as written, retain it. Everything past those three things is either optional or off limits.
Start from the current blank form. The IRS reissues Form W-4 for each tax year and publishes the PDF on its About Form W-4 page, so pull it from there rather than from the copy saved in your onboarding folder two years ago. A valid W-4 already on file for an existing employee stays valid; only the blank you hand a new hire needs to be this year's.
Applying the entries as written is the duty employers improvise on. You are not required to audit them, and you do not quietly adjust one because it looks wrong to you. The employee signs Step 5 under penalties of perjury, so what is on the form is theirs to answer for.
File the signed copy with the rest of the new hire paperwork and keep it afterwards with your payroll records, since IRS Publication 15 (Circular E), for use in 2026, lists copies of Forms W-4 among the employment tax records you hold for at least four years. You do not routinely send them to the IRS, although the IRS can direct you in writing to send specific ones.
Now the boundary employers cross without noticing. It is not a rule the IRS enforces against you but a line you hold for your own protection: do not tell an employee what to put in Steps 1 through 5. Their correct withholding turns on facts you do not have and have no business holding, such as a spouse's income, a second job, investment income, and what they plan to deduct.
Answer any of that and you are giving individual tax advice, on a form they signed and you did not. If the number then comes out wrong at filing time, you have handed a disappointed employee a reason to point at you rather than at their own entries, and you were never the person qualified to make the call.
The correct move is one sentence long. Send them to the IRS Tax Withholding Estimator, the tool Publication 15-T (2026) suggests employers recommend for multiple jobs, investment income, and part-year work, and tell them that anything past that is a question for their own tax preparer. Helpful, accurate, and none of it is your liability.
When There Is No W-4
When there is no W-4, you still withhold, at a default the IRS sets. Waiting instead is a classic first-time employer mistake, and it comes from an entirely decent instinct: the form has not come back, so you hold off.
The same default applies when an employee hands you an invalid form. The exception is an employee you already hold an earlier valid W-4 for: you keep withholding based on that one instead.
Exempt, and the February Deadline
An employee who had no federal income tax liability last year and expects none this year can claim exempt on their W-4, and you then withhold no federal income tax from their pay.
Employers get two things about that wrong.
The first is that exempt does not mean nothing comes out. It applies to income tax only. You still withhold Social Security and Medicare in full, from the first dollar, and you still pay your matching share. An employee who claims exempt expecting a clean paycheck is going to be disappointed, and telling them in advance costs you nothing.
So every February, in the middle of your year-end reporting, you have a second deadline that nobody sends you a reminder about, attached to a small number of employees you probably cannot name off the top of your head. Put it in the calendar in January.
When the IRS Overrides You
The IRS can write to you and tell you to ignore your employee's W-4. Most small employers have never heard of this and do not see it coming.
That instruction is called a lock-in letter. The IRS issues one where it identifies a serious under-withholding problem for a specific employee, and it specifies the withholding you must apply. Once it is in effect, you follow it.
The counterintuitive part is what happens next. Per the IRS guidance on withholding compliance, if the employee then gives you a revised W-4 that results in more withholding than the lock-in letter requires, you must honor it. If it results in less, you must ignore it and keep withholding per the letter.
So the rule is asymmetric and it is worth understanding rather than improvising: the employee can always ask you to withhold more. Once a lock-in letter exists, they cannot ask you to withhold less, and if they are unhappy about it, the person they need to speak to is the IRS rather than you.
How the Amount Is Calculated
The amount comes from the employee's taxable wages, their filing status and other entries, and your pay frequency, run through the IRS tables. You are not going to do this by hand, and you should not try. But you should understand what the software is doing, because it is only as right as what you fed it.
One exception: bonuses do not follow this path. Supplemental wages may be withheld at a flat rate rather than through the tables, which is why an employee receiving a bonus sees a withholding percentage that looks nothing like their usual one and concludes they were penalized for good work. They were not.
The flat rate has a number attached to it. Per IRS Publication 15 (Circular E), supplemental wages paid separately from regular wages may be withheld at an optional flat 22 percent, and withholding is mandatory at 37 percent on cumulative supplemental wages above $1 million in a calendar year.
Federal Withholding Tables: How to Read Them
The federal withholding tables are not a rate card you can memorize. They live in IRS Publication 15-T, which sets out two main routes to a number: the percentage method, which calculates from an annualized taxable wage, and the wage bracket method, which reads a figure straight out of a grid.
They come from the IRS and from nowhere else, and they are reissued for every tax year because the bracket boundaries are inflation adjusted. The edition current as I write this is Publication 15-T (2026), Federal Income Tax Withholding Methods. Same worksheets each year, different numbers inside the rows.
Take the wage bracket method first, because it is the one written for people doing this without software. You adjust the period wage for the other income and the deductions entered in Steps 4(a) and 4(b) of their W-4, open the grid for your pay frequency, find the row, and read across. The withholding amount is printed in the cell rather than calculated.
The row is where people go wrong. Each row covers a span, printed as at least one amount and less than the next, so your wage falls inside a band rather than matching a line. Then you read across to the column for their filing status and for whether the Step 2 box on their W-4 is checked.
The wage bracket method has a ceiling. Per Publication 15-T (2026), its tables cover a limited amount of annual wages, generally less than $100,000, and if taxable wages run past the last bracket for that filing status and pay period, you have to abandon the grid and use the percentage method instead.
The percentage method has no such ceiling, and that is the whole reason it exists. Worksheet 1A annualizes the period wage, subtracts a fixed amount, lands the result in a row of an annual rate schedule, applies a base dollar figure plus a percentage of the excess over the bottom of that row, then divides the year back into paychecks.
So, plainly: a small employer running payroll by hand can use the wage bracket method, which is exactly what it was published for. Payroll software uses the percentage method regardless, for every employee, because Publication 15-T says that method works at any wage level and with a Form W-4 from any year.
Here is that percentage method run end to end on one person: single, a W-4 from 2020 or later with the Step 2 box unchecked and nothing entered in Steps 3 or 4, paid biweekly.
One detail in that ladder explains the zero from earlier in this article. The single schedule charges nothing until the adjusted annual wage clears $7,500, and the worksheet has already taken $8,600 off. Add those and you get $16,100, which is the standard deduction for a single filer for tax year 2026 under the IRS inflation adjustments in Rev. Proc. 2025-32.
That is the deduction being built into the tables, and the married filing jointly rows do the same thing with $19,300 and $12,900. Nobody is applying a deduction later. It is already sitting inside the row you looked up, which is why a low earner reaches the bottom band and withholds nothing.
Now the part that quietly goes wrong. The payroll withholding tables are reissued for each tax year and the rows move, so running January payroll off last year's copy makes every check wrong by a small amount, in the same direction, for as long as nobody notices.
Nothing in your process flags that. It surfaces at year end, when the W-2 reports withholding that does not line up with what the employee actually owed, and you cannot go back and re-withhold wages you already paid. They settle the difference on their return and then ask you about it.
Depositing Is Not Filing
Depositing and filing are two separate obligations, with two separate schedules and two separate penalties, and confusing them is one of the most reliable ways to be punished for something you thought you had done.
| Depositing | Filing | |
|---|---|---|
| What it is | Sending the money to the IRS | Reporting what happened, on Form 941 |
| How often | On a schedule the IRS assigns you. Monthly for most small employers | Quarterly |
| Driven by | Your prior tax liability, not your choice | The calendar |
| Miss it and | A failure-to-deposit penalty, tiered by how late | A failure-to-file penalty, separate and additional |
| The trap | It is due long before the return is | Filing on time does not fix a late deposit |
The consequence is that a business can file its 941 perfectly on time, every quarter, and still be accruing penalties, because the deposits behind it were late. That is why payroll feels finished when the employees have been paid and is not finished until the government has been paid too.
The monthly schedule has one date on it. Per the IRS employment tax due dates, a monthly schedule depositor deposits the taxes for a month by the fifteenth day of the following month, and which schedule you are on is set by the tax you reported over an earlier lookback period rather than by preference.
Common Mistakes
The thread running through the serious ones is a single misunderstanding of what kind of money this is. Every other obligation in your business is a debt: something you owe, which can be negotiated, deferred, and in the worst case discharged along with the company.
Withheld tax is not a debt. It is property you are holding. And the law's response to somebody who spends property they were holding in trust is categorically different from its response to somebody who cannot pay their bills, which is why this one liability reaches through the entity, through the bankruptcy, and into your own bank account.
So the practical rule is short. Treat the withheld money as gone on the day you run payroll, keep it somewhere it does not look spendable, and deposit it on your assigned schedule. Get every new hire's tax form signed before the first run, and put the February exempt deadline in the calendar every January.
Frequently Asked Questions
What is federal withholding?
Federal withholding is the federal income tax an employer takes out of each paycheck and sends to the IRS for the employee. Think of it as the employee prepaying their annual tax bill in small pieces through the year, instead of paying it all at once when they file. For you as the employer, the key point is ownership: that money never becomes yours. It is the employee's tax, you deducted it for the government, and until it reaches the IRS you are only its custodian, holding it in trust. Treating it as business cash is where the real trouble starts.
What is federal withholding tax?
The same thing, and the terms federal withholding, federal tax withholding, federal withholding tax, and fed withholding all refer to it. It is the federal income tax deducted from wages at source. Withholding tax as a broader term can also cover other situations where tax is deducted before payment reaches the recipient, but in a payroll context it means the federal income tax you take out of your employees' paychecks and remit to the IRS. Unlike Social Security and Medicare, which run at fixed rates, the amount depends on the employee’s Form W-4 and the IRS withholding tables, so it differs from one person to the next, and you do not match it.
What is the threshold for federal tax withholding?
There is no single dollar figure, and the answer surprises people. Federal income tax withholding is calculated from the employee's Form W-4 and the IRS withholding tables, and those tables build in the standard deduction. The practical effect is that an employee earning below a certain amount for the pay period has no federal income tax withheld at all, because their projected annual income falls below the point at which any tax is due. The exact figure depends on their filing status and pay frequency rather than being a fixed number. So a $0.00 federal line on a low earner’s pay stub usually means payroll is working, not broken. Social Security and Medicare are different: they have no threshold and come out from the first dollar.
Why is no federal tax being withheld from my employee's paycheck?
Most likely because they earn too little for any to be due, and payroll is working correctly. Federal income tax withholding is calculated against tables that account for the standard deduction, so a part-time or low-wage employee can legitimately show $0.00 withheld. In the 2026 weekly tables, for example, the standard column for Single or Married Filing Separately reads $0 on every row below $315 of adjusted wages, so a part-time employee earning $300 a week has nothing withheld. The other possibilities are that they claimed exempt on their W-4, or that their W-4 has entries reducing their withholding. What should never be zero is FICA, because Social Security and Medicare have no threshold and are withheld from the very first dollar. If either of those lines is blank on a pay stub, something genuinely is wrong.
What is the difference between federal withholding and FICA?
They are two separate taxes that follow separate rules. Federal income tax withholding is the employee's own income tax: the amount depends on their W-4, it differs from one person to the next, nothing is withheld below a certain wage, and you never match it. FICA is Social Security and Medicare, charged at fixed rates of 6.2 and 1.45 percent with no wage floor, so it starts with the first dollar, and you match every dollar of it from your own funds. Apart from sharing a paycheck and a destination, the two have very little in common, so keep them apart in your head.
Do I match federal income tax withholding?
No. You match FICA, meaning Social Security and Medicare, dollar for dollar out of your own funds. You do not match federal income tax withholding at all. That tax is the employee's alone; you are simply the collection mechanism. In practice you pay the same 6.2 percent for Social Security and 1.45 percent for Medicare that you withheld, 7.65 percent in total, and nothing on top of the income tax line. It is a useful distinction to hold onto because it maps exactly onto the trust fund question: the income tax you withheld is entirely their money held by you, whereas your matching FICA share is genuinely your own business expense. That is also why the Trust Fund Recovery Penalty reaches the withheld income tax and the employee's share of FICA, but not your match.
What happens if I do not deposit the federal withholding I collected?
This is the most dangerous thing you can do in payroll, and the damage does not stay inside the business. The income tax you withheld and the employee's share of FICA are trust fund money. If a responsible person willfully fails to pay them over, the Trust Fund Recovery Penalty can make that person personally liable for 100 percent of the unpaid amount, plus interest. An LLC offers no shelter, since the IRS assesses the penalty against the individual rather than the company, and the liability generally survives bankruptcy as well. Willful is a lower bar than it sounds: the IRS says you act willfully if you pay other business expenses instead of the withholding taxes.
What counts as willful for the Trust Fund Recovery Penalty?
Far less than the word suggests, which is why honest owners get caught by it. Per the IRS, willfully here means voluntarily, consciously, and intentionally, and nobody has to show that you lied or meant to cheat anyone. It is enough that you used money that was available to pay some other creditor, such as rent or a supplier, instead of the withheld taxes. Paying your staff their net wages counts too. When cash runs short, the rule gives employees owed wages no special standing: they are one more creditor, and paying them ahead of the IRS is precisely the behavior the penalty is designed to punish. The Internal Revenue Manual says so directly, and adds that instructions from a supervisor not to pay the taxes do not relieve an otherwise responsible person.
Can the IRS come after me personally if my business is an LLC?
For trust fund taxes, yes. The Trust Fund Recovery Penalty is assessed against the individual rather than against the entity, which means there is no corporate veil for it to pierce, because it never went near the entity in the first place. An LLC, an S corporation, and a C corporation all leave you exposed on this specific liability. The amount is the full unpaid trust fund tax, meaning the withheld income tax and the employee's share of FICA, plus interest; your own matching share is not part of it. Closing the company does not end it, and because withheld taxes are excepted from discharge, even a personal bankruptcy generally does not wipe it out. It is one of the few situations where the structure you chose to protect your personal assets simply does not apply.
Who is a responsible person for the Trust Fund Recovery Penalty?
Anyone with the duty and the authority to collect, account for, and pay over the taxes, and it is defined by actual control rather than by job title. The IRS looks at who is an officer, director, or shareholder, who can sign checks, who decides which creditors get paid, who can hire and fire, and who controls payroll and makes the deposits. Owners are the obvious target, but a controller or office manager who genuinely decides which bills get paid is exposed as well. The line falls at people who only carry out other people's decisions: the IRS manual says a bookkeeper who has to ask which bills to pay should generally not be held responsible. And if you do meet the test, a boss who told you not to pay is no defense.
What if an employee does not give me a W-4?
You still withhold, and you do not get to choose the rate. The IRS tells you to handle a new hire with no Form W-4 as a single filer, or married filing separately, under Step 1(c), with nothing entered in Step 2, Step 3, or Step 4. That default is not a punishment, there is no stiffer rate to switch to, and none of it is up to you. What you must not do is skip withholding while you wait. Taking nothing out is a failure to withhold, and it becomes your liability, not the employee's, even though they are the one who never returned the paperwork. Run payroll at the default and keep asking for the form.
How long do I have to keep a W-4?
At least four years, counted from the date you file the fourth-quarter return for that year. The IRS treats a W-4 as an employment tax record, and employment tax records carry a four-year retention floor. That runs a year past the three years the federal wage and hour rules require for payroll records, so do not let the shorter rule set your schedule. The point of keeping the form is proof: it shows you withheld what the employee told you to, and the IRS can ask to see it. A copy buried in an old email thread does not really count. The real test is whether you can pull up one named employee's form years after they signed it.
Can an employee claim exempt from federal withholding?
Yes, provided they had no federal income tax liability last year and expect none this year. An employee who meets both conditions and claims exempt on their W-4 has no federal income tax taken from their wages. The exemption stops there, though. It covers income tax only, so Social Security and Medicare still come out of every check at the usual rates, and your employer match is still due. An employee may expect exempt to mean a paycheck with no deductions at all, so telling them up front that FICA continues saves an awkward conversation after the first payday. The claim also lasts only for the calendar year in which the employee gave you the form, so it has to be renewed with a new W-4 each February.
Does an exempt W-4 need to be renewed?
Yes, every year, and it is the deadline employers miss. An exempt W-4 lasts only for the calendar year the employee gave it to you. To keep the exemption, they must hand in a fresh W-4 claiming exempt by February 15, or by the next business day when that date lands on a weekend or legal holiday, which makes the 2027 deadline February 16. No new form by then means you switch them to withholding as Single or Married filing separately with no other entries. If a new exempt form turns up after the deadline, you may apply it to future paychecks, but you do not refund the tax already withheld in the gap.
What is a lock-in letter?
A lock-in letter is an IRS notice telling you how much to withhold from one specific employee, and it overrides the W-4 that employee gave you. The IRS sends one when it concludes that person is seriously under-withheld, and once the letter takes effect you are bound by it. The twist comes when the employee hands you a new W-4 afterwards. A form that would raise their withholding above the letter's level gets applied. A form that would lower it gets set aside, and you keep following the letter. If the employee disagrees, their argument is with the IRS, not with you.
How do I calculate federal withholding?
Using the employee's W-4 and the withholding methods in IRS Publication 15-T, which sets out both a wage bracket method and a percentage method. The wage bracket method reads the amount straight out of a grid for your pay frequency, but its tables generally cover wages under $100,000 a year. The percentage method annualizes the period wage, applies a rate schedule, and divides the result back into paychecks, and it works at any wage level. In practice you will not do this by hand, because any payroll system does it for you and does it correctly. What matters is that the inputs are right: the correct filing status, the correct entries from the W-4, the correct pay frequency, and the correct taxable wages, which means gross pay minus pre-tax deductions. The arithmetic is the software's job. The inputs are yours.
What is the difference between depositing and filing?
They are separate obligations on separate schedules and confusing them is a standard route to a penalty. Depositing is sending the money, and it happens on a schedule the IRS assigns you based on your prior tax liability over a lookback period, which for most small employers is monthly: the taxes for one month are due by the fifteenth day of the next. Filing is reporting what happened, on Form 941, quarterly. Each has its own penalty, a failure-to-deposit penalty tiered by how late the money arrives and a separate failure-to-file penalty on top of it. You can file the return perfectly on time and still owe a penalty because your deposits were late, and depositing does not relieve you of the requirement to file. Payroll is not finished when the employees are paid; it is finished when the government has been paid too.
How is a bonus withheld?
Differently, and the employee will notice. Bonuses and commissions are supplemental wages. When you pay one separately from regular wages, you can withhold at an optional flat 22 percent, and withholding becomes a mandatory 37 percent once a person's supplemental wages pass $1 million inside a calendar year. The result is a bonus check taxed at a rate that looks nothing like the employee's usual one, and some will assume the company is docking them for doing well. Nothing of the kind is happening. The flat rate is only a withholding method, and any difference evens out when they file their return. Expect the question and have a one-sentence answer ready.
Does federal withholding come out of gross pay or taxable wages?
Taxable wages, which is gross pay minus pre-tax deductions. A traditional 401(k) contribution and a health premium running through a Section 125 plan both reduce the base on which federal income tax is calculated. This is where employers get confused, because FICA uses a different base: a Section 125 premium lowers the wages Social Security and Medicare are charged on, while a 401(k) deferral leaves them untouched. So whenever an employee defers into a 401(k), the two taxes on the same paycheck are calculated against two different figures, deliberately. Form W-2 shows the same split: a 401(k) deferral stays out of Box 1 but is included in Boxes 3 and 5, the Social Security and Medicare wages.
Do I withhold federal tax from contractors?
No. Federal income tax withholding applies to employees, not to independent contractors. The one exception is 24 percent backup withholding, which kicks in when a contractor has not given you a correct taxpayer identification number. Otherwise a contractor is paid the full amount, handles their own tax through estimated payments, and receives a Form 1099-NEC rather than a W-2 once you pay them $2,000 or more in a year. That makes worker classification far more than a paperwork question. If a contractor is reclassified as an employee, you owe your full matching FICA for the period, a statutory share of the income tax and employee FICA you never withheld, and penalties. If the IRS finds you intentionally disregarded the rules, that share rises to the full withholding.