Running payroll in the United States means satisfying three layers of rules at once: federal wage and tax law, the labor code of every state where you have a worker, and sometimes a local ordinance too. Miss a layer and the penalties land on the employer.
This guide walks the full payroll lifecycle, from the registrations you need before the first hire to the filings you owe after the last paycheck. A later section covers what employees see on their pay stubs, which helps when they bring you questions.
What payroll compliance actually covers
Payroll compliance is the work of following the federal, state, and local laws that govern employee pay and the collection and remittance of payroll taxes. In practice it comes down to four recurring obligations.
- Calculating wages correctly, including overtime
- Withholding the right amount for every applicable payroll tax
- Depositing those tax liabilities with each agency on time
- Filing payroll tax returns in every jurisdiction where you owe them
None of the four is optional, and each one has its own deadline. The complexity is less about any single rule than about tracking all of them across every state you operate in.
Step 1: Know the state rules that apply to each worker
Each state's Department of Labor oversees employer and employee matters within its borders. The rules that apply are those of the state where the employee actually works, not where your company is registered or where your finance team sits.
State labor law is what governs employee versus independent contractor status, unemployment insurance, leave entitlements, minimum pay rates, and permitted pay frequency. Two employees doing identical jobs in different states can carry meaningfully different obligations.
Step 2: Complete your employer registrations before the first payroll
Before you can legally pay anyone in a state, you generally need to register with that state's agencies. Which registrations apply depends on the state and on the nature of the work.
- State withholding tax account, so you can remit income tax withheld from wages
- State unemployment insurance (SUI), which funds unemployment benefits and carries an experience-rated rate
- Workers' compensation coverage, mandatory in nearly every state once you have employees
- Paid family and medical leave programs, where the state operates one
- Local tax accounts, in jurisdictions that levy their own wage or occupational tax
Registrations take time to process, so start them well before your intended first pay date. Paying wages in a state where you are not registered is one of the most common and most avoidable compliance failures.
Step 3: Classify the worker correctly, then onboard
Classification comes first because it determines everything downstream. An employee receives benefits and protections under the Fair Labor Standards Act and has taxes withheld by you. An independent contractor runs their own business, handles their own taxes, and receives none of those protections.
Getting this wrong is expensive. Misclassification exposes you to back taxes, unpaid overtime, penalties, and interest, and several states apply a stricter test than the federal one. Our W-2 vs 1099 worker classification guide walks through the tests in detail.
Once classification is settled, onboarding should clarify the terms of employment, set out the benefits on offer, and get the agreement executed. For employees you collect a Form W-4 and complete Form I-9. For contractors you collect a Form W-9 instead.
Step 4: Set wages, overtime, and pay frequency
Federal law sets a floor, and many states set a higher one. Where the two differ, the higher rate applies.
- Minimum wage: the federal minimum is $7.25 an hour, but a majority of states now mandate more, and some cities more still
- Overtime: non-exempt employees earn at least 1.5 times their regular rate for hours worked beyond 40 in a week
- Exempt status: salaried employees are only exempt from overtime if they clear both a duties test and a salary threshold. That threshold has been through repeated rulemaking and litigation, so confirm the figure currently in force before you classify anyone as exempt
Pay frequency is a state matter. Weekly, biweekly, semi-monthly, and monthly cycles are all common, but each state dictates which are permitted and how soon after a pay period ends the wages must be delivered.
Step 5: Withhold and deposit payroll taxes
Payroll taxes split into amounts you withhold from the employee and amounts you owe as the employer. Both are your responsibility to remit.
- Federal income tax, withheld according to the employee's Form W-4
- Social Security, at 6.2% from the employee and 6.2% matched by you, applied up to an annual wage base the Social Security Administration adjusts each year
- Medicare, at 1.45% from the employee and 1.45% matched by you, with an additional 0.9% withheld from high earners above a statutory threshold
- FUTA, the federal unemployment tax, paid entirely by the employer
- State income tax and SUI, at rates that vary by state and, for SUI, by your own claims history
Deposit timing is not up to you. The IRS assigns a monthly or semiweekly schedule based on your prior-period liability, and late deposits carry penalties that escalate with the delay. Our guide to payroll taxes in the US breaks each tax down in more depth.
Step 6: Enroll employees in benefits
Benefits enrollment should follow the terms you set out in the employment agreement, covering retirement plans such as a 401(k) and medical insurance.
Enrollment windows and eligibility waiting periods matter here, because a missed window can leave an employee uncovered for months. If you are still deciding when to introduce coverage, see our note on when to start employee health benefits.
Step 7: File your payroll returns on schedule
Depositing tax is a separate obligation from reporting it. The core federal filings are consistent across employers.
- Form 941, filed quarterly to report wages, withholding, and FICA
- Form 940, filed annually for federal unemployment tax
- Form W-2, issued to each employee and filed with the Social Security Administration by January 31
- Form 1099-NEC, issued to contractors you paid during the year, also due January 31
- State returns, on each state's own quarterly or annual cycle
Non-compliance here is what triggers most penalties. Late or inaccurate filings bring fines and interest, and repeated failures raise your audit risk.
Step 8: Issue pay stubs and keep records
Most states require you to give employees a pay stub showing gross pay, each deduction, and net pay for the period. Electronic stubs are acceptable in most jurisdictions, though a few still require a paper option on request.
Keep payroll records for the retention period your jurisdiction specifies. Clean records are what make an audit straightforward rather than painful.
Step 9: Handle final paychecks correctly
Termination is where state law diverges most sharply. Some states require the final paycheck on the termination date itself, others allow it by the next regular pay date, and the rule can differ depending on whether the employee quit or was let go.
Accrued but unused vacation or PTO may also have to be paid out, depending on the state and on your own written policy. Our guide to employee termination in the US covers the wider legal and HR obligations.
What employees see on their paycheck
Employees rarely read a pay stub until something looks wrong, and then they come to you. Being able to explain the deductions clearly prevents most of those conversations from escalating.
Mandatory deductions are the ones neither side chooses: federal and state income tax withholding, plus the employee share of Social Security and Medicare, which appear together as FICA.
Voluntary deductions are the ones the employee elected, such as health insurance premiums and retirement contributions. These reduce take-home pay but often reduce taxable income too.
The gap between gross and net pay is simply the sum of those two categories. When an employee queries a change in net pay, the cause is usually a W-4 update, a benefits election, or a wage base threshold being reached partway through the year.
Multi-state payroll multiplies the work
Every state you add brings its own registrations, rates, filing calendar, and pay rules. Remote hiring means many businesses now owe payroll obligations in states where they have no office at all.
Reciprocity agreements between some states, and differing rules on which state's tax applies to a remote worker, make this the area where employers most often discover a problem late. Our review of common payroll compliance issues covers the failures we see most.
What non-compliance costs
Payroll rules change often enough that falling behind is easy, and the consequences compound.
- Audits and fines from federal and state agencies
- Penalties and interest on late deposits and filings, plus legal costs
- Back pay and damages where wages or overtime were underpaid
- Reduced employee morale, and reputational damage that outlasts the fine
Conversely, timely and accurate pay is one of the cheapest ways to keep a workforce settled. It is a compliance obligation and a retention lever at the same time.
Preparing for a payroll audit
A state Department of Labor or workers' compensation carrier can open an audit with little notice. What they examine is usually the same: worker classification, wage calculations, deposit timeliness, and the completeness of your records.
If your registrations, filings, and records are current, an audit is an administrative exercise. If they are not, it becomes an assessment. See our note on payroll audit support for how to prepare.
How FinStackk handles payroll compliance
FinStackk manages payroll as part of a wider accounting and tax compliance service, so registrations, withholding, deposits, and filings are handled together rather than in isolation from your books.
That includes multi-state registrations, classification reviews, on-schedule deposits and returns, and year-end W-2 and 1099 issuance. If you want to talk through your own payroll setup, get in touch with our team.
*The information provided on this article does not, and is not intended to, constitute legal advice; instead, all information and content provided here is for general informational purposes only.