Form 941 is the IRS quarterly return employers file to report wages paid plus income, Social Security, and Medicare taxes withheld — due the last day of the month following each quarter-end.
Form 941 is the central payroll tax compliance document for employers. Filed quarterly, it reports: total wages, tips, and compensation paid; federal income tax withheld from employees; employee and employer shares of Social Security tax; employee and employer shares of Medicare tax; and any adjustments for prior quarters. The total tax liability drives deposit requirements. Deposit schedules — monthly vs. semi-weekly — are assigned by the IRS based on the employer's payroll tax lookback period (prior four quarters of Form 941 liability). Monthly depositors pay accumulated tax by the 15th of the following month. Semi-weekly depositors pay within 1-3 business days after payday, depending on the payday. All employers must deposit on the next business day if total tax liability on any payday exceeds $100,000. Penalties for late deposits are steep: 2% for deposits 1-5 days late, 5% for 6-15 days late, 10% for deposits more than 15 days late, and 15% for amounts not deposited by 10 days after the IRS's first delinquency notice. The Trust Fund Recovery Penalty (100% of unpaid employee-side taxes) can additionally be assessed personally against responsible persons. For businesses that may struggle with payroll obligations during slow periods, addressing cash flow proactively is critical — many business failures begin with falling behind on 941 deposits. The IRS has an installment agreement process for businesses with outstanding 941 balances, but these are structured around mandatory compliance going forward.
Q1 (Jan–Mar): April 30. Q2 (Apr–Jun): July 31. Q3 (Jul–Sep): October 31. Q4 (Oct–Dec): January 31. If you made all required deposits on time and fully, the IRS grants a 10-day extension on the filing (not the deposits). The return deadline and deposit deadline are separate.
Form 941 is filed quarterly and covers FICA (Social Security + Medicare) plus income tax withholding. Form 940 is filed annually and covers FUTA (Federal Unemployment Tax). Both are employer responsibilities, but they cover different taxes on different filing schedules.
Penalties start at 2% for deposits just 1–5 days late and escalate to 15% for severe delinquency. The Trust Fund Recovery Penalty (100%) can be personally assessed for unpaid employee-side taxes. If you're behind on payroll tax deposits, consult a tax professional immediately — the IRS has resolution programs, but outstanding payroll taxes are a priority enforcement category.