US Payroll Taxes for Small Employers: A Compliance Walkthrough

Hiring your first employee in the United States converts you into a tax collection agent. You withhold money from someone else's pay, hold it in trust, and remit it on a schedule the IRS sets. The obligations are mechanical rather than difficult, but the penalties for mishandling trust fund money are the harshest in the code, so the process deserves setting up properly from day one.

Four things come out of or accompany each paycheck. Federal income tax is withheld according to the employee's Form W-4. Social Security is withheld at 6.2 per cent up to the annual wage base, $184,500 for 2026, and Medicare at 1.45 per cent on all wages, with an additional 0.9 per cent withheld above $200,000. The employer matches the Social Security and regular Medicare amounts from its own funds — but not the additional Medicare tax. State and sometimes local income tax withholding sits alongside.

Unemployment tax is employer-only. Federal unemployment tax applies at 6 per cent on the first $7,000 of each employee's wages, reduced by a credit of up to 5.4 per cent for timely state unemployment payments, which brings the effective rate to 0.6 per cent for most employers. State unemployment rates vary by state and by your own claims experience, and new employers start on an assigned rate that improves or worsens over time.

Deposits follow a schedule determined by your prior-year liability: monthly depositors remit by the 15th of the following month, semi-weekly depositors remit within days of each payday. Very large liabilities trigger a next-day deposit rule. Deposits must be made electronically through EFTPS. Late deposit penalties escalate by how late the payment is, reaching 15 per cent, and they apply to the deposit rather than the return.

Returns are quarterly and annual. Form 941 reports wages and withholding each quarter, due by the end of the month following the quarter. Form 940 reports federal unemployment tax annually in January. W-2s must be furnished to employees and filed with the Social Security Administration by 31 January, with Form W-3 as the transmittal. Contractors receive 1099-NEC forms on the same date. State agencies have their own parallel quarterly wage reports.

Setup requires a few registrations in a specific order. Obtain a federal Employer Identification Number, register with your state revenue department for withholding and with the state workforce agency for unemployment insurance, arrange workers' compensation insurance where required, and complete Form I-9 verification for each new hire within the statutory window. Every employee should also complete a state withholding certificate where one exists.

The most serious risk is trust fund liability. Amounts withheld from employees belong to the government, and responsible persons — owners, officers, bookkeepers with cheque-signing authority — can be held personally liable for a penalty equal to the unpaid trust fund portion, regardless of corporate structure. Using withheld payroll taxes to cover a cash shortfall is the mistake that most often destroys an otherwise viable small business.

Two practical recommendations follow. First, use a payroll provider or at minimum payroll software; the cost is small relative to a single late-deposit penalty and the calculations, deposits and filings are handled for you. Second, classify workers carefully, because reclassification of a contractor as an employee brings back taxes, penalties and interest across all open years. Our payroll and payslip tools cover the document side of employment; for US payroll tax remittance, pair them with a compliant filing process.