How to Do Payroll Yourself: Steps, Risks, and Deadlines
Doing payroll yourself is legal at a few employees. The accounts to open first, gross pay, withholding, the deposit schedule, and when to stop.
I ran my own payroll for about eighteen months. Two employees, one state, a spreadsheet I built myself, and a calendar with six dates on it. It worked, it cost nothing in fees, and I would tell a founder in the same position to do the same thing. I would also tell them when to stop, because I left it six months too late and paid for the privilege.
Doing payroll yourself is legal. Nothing in federal law requires software, a service, or an accountant, and the IRS has no opinion about who did the arithmetic as long as the numbers are right and the money arrives on the correct day. What catches people out is never the calculation. It is the gap between paying your people, which feels like the end of the job, and remitting the tax you withheld, which happens weeks later with nothing in your day to remind you.
This is the walkthrough for an employer without an HR department: the accounts that must exist before the first payday, the arithmetic, the deposit schedule the IRS assigns you without asking, the filings, what you keep, and the point where doing this yourself stops being worth it.
I build the people and records tooling at FirstHR, an onboarding and HR platform rather than a payroll provider, so nothing here is a pitch for a payroll product. This is general information, not tax or legal advice.
Can You Legally Do Payroll Yourself?
Yes, and there is no threshold, license, or approval involved. No federal statute requires an employer to use payroll software or a payroll service, and no state conditions your right to employ people on outsourcing the paperwork. The obligations attach to the outcome rather than to the method.
People assume a provider makes them safe because it feels like handing over responsibility, and it does not. If a provider misses a deposit, the notice arrives addressed to your business, and the trust fund penalty regime reaches the individuals inside it (IRS). Software buys accuracy and reminders, not indemnity.
What you are really choosing is where the deadline discipline lives. A payroll system holds the calendar and updates the tax tables every January; doing it yourself makes both jobs on your own list.
What You Need Before the First Run
Before the first run you need federal and state tax accounts, a way to make electronic federal deposits, and each new hire's W-4 and I-9, with a state new hire report soon after. Two of these, the state accounts and the enrollment for electronic deposits, run on an agency's timetable rather than yours, so start when you decide to hire, not the week the person arrives.
| What you need | Who issues it | Realistic lead time | Without it |
|---|---|---|---|
| Employer identification number | IRS, free, online | Same session | State accounts and federal returns all ask for it |
| State withholding account | State revenue department | One day to several weeks | You withhold state tax with nowhere to send it |
| State unemployment account | State workforce agency | One day to several weeks | Unpaid state tax accrues with interest |
| Electronic federal tax payments | Treasury’s EFTPS, free | Days, plus a mailed confirmation | IRS Direct Pay still takes deposits, with no sign-in |
| Signed Form W-4 | The employee, on hire | Minutes, if you ask on day one | You withhold at the default single rate |
| Completed Form I-9 | You and the employee | Three business days from the start date | A per-form penalty you cannot argue away later |
The federal number is the easy one. It is free and the online application issues it immediately. That route needs the responsible party's Social Security number or individual taxpayer identification number and a principal place of business in the United States or a U.S. territory, and it issues one number per responsible party per day (IRS).
The state layer is where first paydays slip, because you need accounts in every state where an employee physically works rather than where your headquarters sits.
The reason this stage goes wrong is that it is a set of separate applications to separate agencies, each returning a number you will need later and none of them chasing you. Track it as one sheet with a date and a confirmation number against every line, and add a row to the second tab for every state where somebody physically works.
| A | B | C | D | E | F | G | |
|---|---|---|---|---|---|---|---|
| 1 | Item | Owner | Date started | Reference, account, or confirmation number | Date confirmed in writing | Where the confirmation is stored | Done |
| 2 | Employer identification number applied for | ||||||
| 3 | Electronic federal tax payment enrollment started | ||||||
| 4 | Mailed enrollment confirmation received and activated | ||||||
| 5 | Deposit schedule determined from the lookback period | ||||||
| 6 | Current year employer tax guide saved locally | ||||||
| 7 | Current year withholding methods publication saved locally | ||||||
| 8 | Pay frequency chosen and checked against state pay timing rules | ||||||
| 9 | State new hire reporting portal identified, with a named filer | ||||||
| 10 | Twelve months of deposit dates entered on the business calendar | ||||||
| 11 | Six federal filing dates entered on the business calendar | ||||||
| 12 | Payroll register export location chosen, off the laptop | ||||||
| 13 | |||||||
| 14 | Note | The two rows that run on an agency clock are the enrollment rows. Start them six weeks out. |
The Toolkit You Actually Need
Four things: the current IRS employer tax guide, the current withholding methods publication, a spreadsheet you trust, and a calendar with every deposit and filing date entered before you owe anything.
Publication 15 carries the rates, the deposit rules, and the retention expectations in one place (Internal Revenue Service). Its companion, Publication 15-T, carries the withholding methods and the tables you compute from, and it changes materially every January (IRS withholding methods). In manual payroll, working from last year's copy means computing withholding from tables the IRS has already replaced.
The spreadsheet matters less than people think: one tab per pay period computing gross, deductions, withholding, and net, with a running year-to-date column that tells you when somebody crosses the Social Security wage base.
The calendar is the part that actually keeps you compliant, and the part people build last or not at all. Enter twelve months of deposit dates and six federal filing dates on the day you set up, before a single deposit is owed.
Calculating Gross Pay
Gross pay is everything the employee earned for the period before a single deduction, and every other number depends on it. For salaried staff it is annual salary divided by the number of pay periods. For hourly staff it is hours actually worked at the agreed rate, plus overtime, plus bonuses, commissions, tips, retroactive adjustments, and taxable fringe benefits.
Overtime is the wrinkle that catches new employers. For non-exempt employees, federal law requires one and a half times the regular rate above forty hours in a workweek, and the regular rate is not the hourly wage. It absorbs non-discretionary bonuses, shift differentials, and commissions earned that week, spread back across the hours worked.
Then, before any tax calculation, subtract pre-tax deductions. The ordering is not cosmetic: a health premium paid through a Section 125 cafeteria plan reduces the base for income tax and for Social Security and Medicare, while a traditional retirement contribution reduces only the income tax base.
Hourly Payroll, Week by Week
Hourly payroll is the same sequence of calculations with one extra constraint: overtime is settled per workweek and never per pay period. Federal rules at 29 CFR 778.105 define the workweek as a fixed, regularly recurring period of 168 hours, seven consecutive 24-hour periods, and it may begin on any day and hour you pick as long as it then stays put.
That constraint bites hardest on a semimonthly schedule, where a period ends mid-week and a single workweek lands across two runs. Total the hours by workweek first, apply overtime to each week that went past forty, and only then add the weeks together for the period. Summing first and applying overtime to the total underpays people.
Rounding recorded time is permitted, with a condition attached. Federal wage and hour rules at 29 CFR 785.48 accept time computed to the nearest five minutes, tenth of an hour, or quarter hour, provided the practice averages out over time and does not consistently favor the business.
A rounding rule that always moves clock-in times later and clock-out times earlier fails that test however small each adjustment looks.
Federal Income Tax Withholding by Hand
Federal income tax withholding is a calculation, not a percentage. It depends on the employee's W-4, your pay frequency, and the current year's tables, and it produces a different answer for every person even when two of them earn the same amount.
Two habits make this survivable. Rebuild the calculation from the new tables every January rather than carrying last year's formulas forward, and spot-check one employee by hand against the published example each time you update, so a broken cell reference surfaces immediately instead of in October.
Supplemental wages, such as bonuses, follow their own path: the flat method applies at 22 percent up to $1 million and 37 percent above that.
FICA, and the Taxes You Pay on Top
Social Security and Medicare, collected together as FICA (the Federal Insurance Contributions Act), are the easy arithmetic and the expensive surprise.
You withhold 6.2 percent for Social Security on wages up to the annual wage base, $192,300 for 2027 as announced by the Social Security Administration in October 2026 ($184,500 for 2026), and 1.45 percent for Medicare with no cap at all (IRS Topic No. 751). Then you match both out of the business.
Above $200,000 of wages in a calendar year you also withhold an additional 0.9 percent of Medicare tax, and the IRS is explicit that there is no employer match for it (IRS questions and answers). You withhold it on wages you paid that person, without regard to filing status or a spouse's income.
Two unemployment taxes sit on top of the match, and in all but three states employees never see either on a pay stub.
Federal unemployment tax runs at 6.0 percent on the first $7,000 of wages paid to each employee, reduced by a credit of up to 5.4 percent when state contributions are paid on time, which brings the effective rate to 0.6 percent, or $42 a year per employee, for most employers (IRS Topic No. 759).
State unemployment tax is the variable one. Each state sets its own wage base and assigns you an experience rate that moves as claims are made against your account, so two identical businesses in neighboring states can pay very different amounts. Alaska, New Jersey, and Pennsylvania also withhold a small employee share from pay (U.S. Department of Labor).
Depositing the Money on the Schedule You Were Assigned
You do not choose your deposit schedule. The IRS assigns it from a lookback period, the four quarters running from July 1 of the second preceding calendar year through June 30 of the preceding one (IRS Topic No. 757).
Report $50,000 or less of employment tax across that lookback window and you are a monthly depositor. Report more and you are semiweekly all of the following year.
| Your situation | When the deposit is due | How you end up here |
|---|---|---|
| Monthly schedule depositor | By the fifteenth of the following month | You reported $50,000 or less in the lookback period |
| Semiweekly, payday Wednesday to Friday | By the following Wednesday | You reported more than $50,000 in the lookback period |
| Semiweekly, payday Saturday to Tuesday | By the following Friday | Same threshold, other half of the week |
| Anyone accumulating $100,000 in a deposit period | Next business day, semiweekly thereafter | One large run can trigger it with no warning letter |
| New employer with no lookback history | Monthly, by the fifteenth | There is nothing to look back at yet |
| Federal unemployment tax | Quarterly, once undeposited tax passes $500 | It accrues slowly and rolls forward until it crosses |
All federal tax deposits have to travel by electronic funds transfer, through EFTPS, IRS Direct Pay, or your IRS business tax account. EFTPS enrollment ends with a PIN that arrives by mail, which is why it belongs in the six-week setup window rather than the week of your first payday.
There is an exception for very small amounts. When your tax for the current or the previous quarter is under $2,500, and you did not trigger the $100,000 next-day rule during the current quarter, IRS Topic No. 757 lets you pay that quarter's tax with a timely filed Form 941 instead of depositing it.
The $100,000 rule ambushes growing businesses because it does not wait for the year to turn over. Accumulate that much liability at any point during a deposit period and the deposit is due the next business day, and you are a semiweekly depositor for the rest of that year and all of the next. A single bonus run can do it.
The Quarterly and Annual Filings
Six federal deadlines a year, plus a state layer that varies. Four of the six are Form 941, and the other two land on January 31 along with everything else in your year-end.
| Filing | What it covers | When it is due |
|---|---|---|
| Form 941 | Withheld income tax plus both halves of FICA, quarterly | April 30, July 31, October 31, January 31 |
| Form 940 | Federal unemployment tax for the calendar year | January 31, or February 10 if every deposit was timely |
| Form W-2 to each employee | Annual wage and tax statement | January 31 |
| Form W-3 with W-2 copies | Transmittal to the Social Security Administration | January 31 |
| Form 1099-NEC | Payments to contractors, not employees | January 31 |
| State withholding return | State income tax withheld from wages | Monthly, quarterly, or annually, set by your state |
| State unemployment wage report | Wages and contributions per employee | Quarterly in most states, end of the following month |
Each base deadline shifts to the next business day when it falls on a weekend or a federal holiday, which is why copying last year's reminders forward can produce a miss.
Form 941 carries a quiet reward: the IRS instructions let you file by the tenth day of the second month after the quarter ends if every deposit was made on time and in full (IRS).
One threshold matters more than it used to. Per the IRS, filing ten or more information returns in aggregate across all types, counting W-2s and 1099s together, means they must be filed electronically. An employer with six employees and four contractors has already crossed it, so the paper route usually is not available.
The 1099-NEC reporting threshold itself has moved. According to the IRS instructions for Forms 1099-MISC and 1099-NEC, you file for a nonemployee you paid $2,000 or more in a calendar year, for payments made on or after January 1, 2026, up from $600 previously. The figure may be adjusted for inflation beginning in 2027, and a state may still apply a lower one.
January is where doing payroll yourself feels heaviest, because year-end reconciliation, W-2s, 1099s, Form 940, and the fourth-quarter Form 941 all arrive together. Reconcile the four quarterly returns against your W-2 totals before filing anything.
Dwight SchruteSales3 people
Darryl PhilbinWarehouse1 person
Kelly KapoorCustomer Service1 personWhat You Have to Keep, and for How Long
Two retention rules apply at the same time and they do not agree, so satisfy the longer one. The IRS asks for at least four years of employment tax records. Federal wage and hour rules ask for at least three years of payroll records and two years of the supporting material behind them.
The wage and hour side is specific. Payroll records, certificates, agreements, and employment contracts have to be preserved for at least three years (29 CFR 516.5), while time cards, wage rate tables, and the working papers behind additions to or deductions from wages carry their own two-year requirement (29 CFR 516.6). The summary outlives the raw material it was built from.
Form I-9 runs on a third clock, kept for three years after the hire date or one year after employment ends, whichever is later (USCIS), and it should live separately from the personnel file so that an inspection of I-9s does not become an inspection of everything else.
When you do payroll by hand, the payroll register for each run is the document everything else reconciles against, and it needs to outlive the spreadsheet it came from. Export it, date it, and store it off the laptop you build the runs on.
What Doing It Yourself Actually Costs
Payroll software is not free and neither is doing it yourself. The difference is that one cost arrives as an invoice you can see and the other arrives as hours you do not measure plus a penalty risk you cannot price.
Start with the hours. A clean run for two or three salaried employees in one state takes fifteen to twenty minutes once the spreadsheet exists. Hourly staff add timesheet review and overtime arithmetic. A benefit deduction adds a monthly reconciliation against the insurer's invoice. Then add a deposit every month, a return every quarter, and a year-end that can take the better part of a weekend.
Then price the risk rather than assuming it away. Late deposits are penalized on a sliding scale that rises with the delay, late returns separately as a percentage of unpaid tax per month, and states add their own on top.
A single quarter of missed deposits can cost more than a year of software, and the calculation is uncomfortable precisely because the penalty is a probability while the fee is a certainty.
What you eventually pay for is not arithmetic, because your spreadsheet does arithmetic. You are buying tax table maintenance, deadline memory, and the year-end forms.
When Doing It Yourself Stops Being Worth It
There is a point where the arithmetic flips, and it is more predictable than it feels from the inside. Five triggers, any one of which is enough on its own, and none of which are about how confident you feel.
An employee in a second state is the sharpest. It is not an increment but a step change: a new registration, a new withholding regime, a new unemployment account and rate, new deadlines, new returns. Remote hiring can bring it sooner than planned.
Your first hourly employee is the second, because salaried-only payroll is genuinely simple while hourly payroll brings timekeeping, overtime on the regular rate, and state rules about rounding, breaks, and pay stubs.
A benefit deduction or a garnishment order is the third, since both mean handling somebody else's money under rules you have to get right. The fourth is plain volume: around eight to ten employees the year-end stops being a weekend job.
The fifth is the economic test, and it is the one to apply. If a full cycle, including the deposit and the record, takes more than about half an hour of your own time a period, the fee is already cheaper than you are. Treat a single missed deadline as the trigger rather than as bad luck, because the second miss is a pattern and the pattern is expensive.
Nick Anisimov, FirstHR founder
Frequently Asked Questions
Can I legally do payroll myself without software?
Yes. Federal law does not make you buy payroll software, hire a payroll service, or retain an accountant. What the law cares about is the outcome, not the method: withholding has to be correct, deposits have to arrive by electronic funds transfer on the schedule the IRS assigned, and returns have to be filed on time. A spreadsheet and a calendar can meet all three as long as you keep them current. What changes with a manual approach is your margin for error, not your legal position. Software refreshes the tax tables each January, tracks the deposit dates, and produces the year-end forms. By hand, all three tasks land on you, and they are the tasks that carry penalties.
What do I need before I can run payroll for the first time?
A short list of tax accounts and new hire paperwork, and two of the items move at an agency’s pace rather than yours. The federal employer identification number is free and comes back online in a single session. Withholding and unemployment accounts are needed in each state where someone physically works, and those can take days or weeks to arrive. You also need a way to send federal deposits electronically: EFTPS mails you a PIN after enrollment, while IRS Direct Pay works without signing in. Each new hire hands you a signed Form W-4, and without one you withhold as if the person were single; the Form I-9 has to be finished within three business days of the start date. A state new hire report follows within twenty days at most. Begin the state registrations roughly six weeks before your first payday.
How do I calculate payroll taxes by hand?
Follow the same sequence every time, because each figure feeds the next one. First get gross pay for the period. Next take out pre-tax deductions: a health premium paid through a Section 125 cafeteria plan lowers the wages subject to income tax, Social Security, and Medicare, whereas a traditional retirement deferral lowers only the wages subject to income tax. Federal income tax then comes from the employee’s W-4 and the current IRS withholding methods, which means a table and formula lookup, not one flat percentage. Social Security is 6.2 percent up to the annual wage base and Medicare is 1.45 percent with no cap, plus an extra 0.9 percent on wages above $200,000. Finish by adding state tax and subtracting post-tax deductions to arrive at net pay.
How often do I have to deposit payroll taxes?
Monthly or semiweekly, and the IRS decides which one rather than you. It sets your schedule from the employment tax you reported during a lookback period, a window of four quarters that begins on July 1 of the second preceding calendar year and ends on June 30 of the preceding calendar year. If that total was $50,000 or less, you deposit monthly, and each deposit is due on the fifteenth day of the next month. If it was higher, you deposit semiweekly: a payday on Wednesday, Thursday, or Friday makes the deposit due the following Wednesday, while a Saturday, Sunday, Monday, or Tuesday payday makes it due the following Friday. Either way, one rule overrides the schedule: when the tax you have accumulated in a deposit period reaches $100,000, the deposit is due the next business day.
What forms do I have to file if I run payroll myself?
Form 941 goes in four times a year, by April 30, July 31, October 31, and January 31, reporting withheld income tax plus both halves of Social Security and Medicare. Form 940 reports federal unemployment tax once a year and is due January 31. Forms W-2 go to employees and Form W-3 with the W-2 copies goes to the Social Security Administration, both by January 31. If you paid contractors, Form 1099-NEC is also due January 31. On top of that sit the state filings: a withholding return on a schedule your state sets, and a quarterly unemployment wage report in most states, carrying their own separate penalties.
How long do I have to keep payroll records?
Two sets of rules run side by side, and the longer one controls. For employment taxes, the IRS wants your records kept at least four years, counted from the later of the date the tax became due and the date you paid it. Under federal wage and hour rules, the payroll records themselves, plus any certificates, agreements, and employment contracts, must be kept for at least three years. The supporting material needs at least two: time cards, wage rate tables, and the working papers behind additions to or deductions from pay. Form I-9 follows its own timeline: three years after the hire date or one year after the person leaves, whichever comes later. The easiest approach is to hold everything for four years and keep the I-9s in a separate file.
What is the biggest risk of doing payroll yourself?
Not arithmetic. Withheld income tax and the employee half of Social Security and Medicare are trust fund money, held on the employee’s behalf rather than owned by the business, and a separate penalty regime lets the IRS pursue the individuals who were responsible for remitting it and willfully did not. That is one corner of payroll where being incorporated does not put a wall between the company and the owner. The practical version is much more ordinary: the business has a tight month, the tax money is sitting in the account, and the deposit slips. Deposits are also penalized separately from filings, so a perfect return filed on the deadline protects you from nothing on the money.
When should I stop doing payroll myself?
The honest triggers are structural rather than emotional. The clearest is a first employee in another state, which brings a fresh registration, unemployment rate, set of deadlines, and returns instead of a small addition. Next comes a first hourly worker, because overtime is figured on the regular rate rather than the base wage, and the two drift apart as soon as a non-discretionary bonus lands in that week. A first benefit deduction or court-ordered garnishment is a third signal, since each adds rules about money that belongs to someone else. Around ten employees, year-end paperwork alone can take a weekend. Last is the cost test: when a run plus its deposit takes more than half an hour of your own time, paying a provider is cheaper than doing it yourself.
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