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.
How to Do Payroll Yourself
Running your own payroll is legal, cheap, and entirely reasonable at a handful of employees in one state. Here is the setup that has to exist before the first payday, the arithmetic you do by hand, the deposit and filing calendar that carries the real risk, and the honest list of moments when doing it yourself stops paying for itself
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, licence, 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. 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
Five things have to exist before you can legally pay anyone, and two of them run on an agency's timetable rather than yours. The right moment to start is 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 | You cannot register anywhere else or file anything |
| 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 | Federal payment system | Days, plus a mailed confirmation | Federal deposits cannot legally be made |
| 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, the online application issues it immediately, and the constraints are that the responsible party needs a valid taxpayer identification number and that you can obtain one 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 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). Working from last year's copy is the most common self-inflicted error in manual payroll.
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 Section 125 health premium reduces the base for income tax and for Social Security and Medicare, while a traditional retirement contribution reduces the income tax base but not the other.
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 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 are the easy arithmetic and the expensive surprise. You withhold 6.2 percent for Social Security on wages up to the annual wage base, which is $184,500 for 2026, and 1.45 percent for Medicare with no cap at all. 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 this one is not matched. 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 employees never see either on a pay stub. Federal unemployment tax runs at 6.0 percent on the first $7,000 of each employee's wages, 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.
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 neighbouring states can pay very different amounts.
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 1 July of the second preceding calendar year through 30 June of the preceding one. Report $50,000 or less of employment tax across that 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 day | 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, so writing a cheque is not an option regardless of how small the amount is. That is why enrolment belongs in the six-week setup window rather than the week of your first payday.
The $100,000 rule ambushes growing businesses because it does not wait for the year to turn over. Accumulate that much liability on any single day 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 31 January 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 | 30 April, 31 July, 31 October, 31 January |
| Form 940 | Federal unemployment tax for the calendar year | 31 January, or 10 February if every deposit was timely |
| Form W-2 to each employee | Annual wage and tax statement | 31 January |
| Form W-3 with W-2 copies | Transmittal to the Social Security Administration | 31 January |
| Form 1099-NEC | Payments to contractors, not employees | 31 January |
| 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 produces at least one miss. Form 941 carries a quiet reward too: deposit everything on time and in full for the quarter and you get ten extra days to file.
One threshold matters more than it used to. 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.
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.
What 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. 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, and it should live separately from the personnel file so that an inspection of I-9s does not become an inspection of everything else.
Doing 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 costs most owners the better part of a weekend.
Then price the risk rather than assuming it away. Late deposits are penalised 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 missed quarterly deposit 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 means most small employers meet this earlier 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.
Frequently Asked Questions
Can I legally do payroll myself without software?
Yes. No federal law requires an employer to use payroll software, a payroll service, or an accountant. The obligations attach to the result rather than the method: withholding has to be correct, deposits have to arrive on the assigned schedule by electronic funds transfer, and returns have to be filed on time. A spreadsheet and a calendar satisfy all three if you maintain them. What changes when you do it by hand is not your legal position but your margin for error. Software updates the tax tables in January, remembers the deposit dates, and produces the year-end forms. Doing it yourself makes all three jobs on your own list, and those are the jobs that carry penalties.
What do I need before I can run payroll for the first time?
Five things, and two of them run on someone else’s timetable. A federal employer identification number, which is free and issued online in one session. State withholding and unemployment accounts in every state where an employee physically works, which can take days or weeks. Enrolment for electronic federal tax payments, which involves a mailed confirmation. A signed Form W-4 and a completed Form I-9 for each person, with the I-9 due within three business days of the start date. And a state new hire report, generally within twenty days. Start the state registrations about six weeks before your first payday rather than the week of it.
How do I calculate payroll taxes by hand?
Work in a fixed order, because each step feeds the next. Start with gross pay for the period. Subtract pre-tax deductions, since a Section 125 health premium reduces the base for income tax and for Social Security and Medicare, while a traditional retirement contribution reduces the income tax base only. Compute federal income tax from the employee’s W-4 using the current IRS withholding methods, which is a table and formula lookup rather than a flat percentage. Then apply 6.2 percent for Social Security up to the annual wage base and 1.45 percent for Medicare with no cap, adding 0.9 percent above $200,000. Add state tax, subtract post-tax deductions, and what remains is net pay.
How often do I have to deposit payroll taxes?
The IRS assigns you a schedule rather than letting you pick one. It looks at the employment tax you reported during a lookback period, the four quarters running from 1 July of the second preceding calendar year through 30 June of the preceding one. Report $50,000 or less and you are a monthly schedule depositor, depositing by the fifteenth day of the following month. Report more and you are a semiweekly depositor, depositing by the following Wednesday for Wednesday, Thursday, or Friday paydays and by the following Friday for Saturday, Sunday, Monday, or Tuesday paydays. One rule overrides both: accumulate $100,000 of liability on a single day and 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 30 April, 31 July, 31 October, and 31 January, reporting withheld income tax plus both halves of Social Security and Medicare. Form 940 reports federal unemployment tax once a year and is due 31 January. Forms W-2 go to employees and Form W-3 with the W-2 copies goes to the Social Security Administration, both by 31 January. If you paid contractors, Form 1099-NEC is also due 31 January. 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 rules apply at once and you should satisfy the longer one. The IRS asks you to keep all records of employment taxes for at least four years after the tax becomes due or is paid, whichever is later. Federal wage and hour rules ask for at least three years of payroll records, certificates, agreements, and employment contracts, plus two years of supporting material such as time cards, wage rate tables, and the calculations behind additions to or deductions from wages. Form I-9 runs on its own clock: three years after the hire date or one year after employment ends, whichever is later. Keeping everything four years, with I-9s stored separately, is the simplest rule.
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 did not. That is the 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 penalised 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. An employee in a second state, because that is a whole new registration, rate, deadline, and return rather than an increment. A first hourly employee, because overtime is computed on the regular rate and not the base hourly wage, and the two diverge the moment a non-discretionary bonus lands in the week. A first benefit deduction or a court-ordered garnishment, both of which add rules you have to get right on someone else’s behalf. Headcount around ten, where year-end paperwork alone eats a weekend. And the economic test: once a run and its deposit take more than half an hour of your own time, the fee is cheaper than you are.