Every employer that withholds federal income tax or pays Social Security and Medicare taxes on wages generally files Form 941, the Employer's Quarterly Federal Tax Return. It tells the IRS how much you paid in wages, how much tax you withheld, how much employer tax you owe and how much you already deposited. When those numbers disagree with your deposits or your year-end W-2s, notices follow.

What the form reports

Form 941 covers one calendar quarter. Its main lines report:

  • Number of employees paid in the quarter
  • Total wages, tips and other compensation
  • Federal income tax withheld
  • Social Security and Medicare wages and tips, and the tax on them (employee and employer shares combined)
  • Adjustments for fractions of cents, sick pay and group-term life insurance
  • Total deposits made for the quarter, and any balance due or overpayment

Employers on the semiweekly deposit schedule also attach Schedule B, which lists tax liability by day. Monthly depositors report liability by month on the form itself.

When it is due

The IRS lists the due dates in the Form 941 instructions: the last day of the month after the quarter ends, so April 30, July 31, October 31 and January 31. If you deposited all tax for the quarter on time, you have an additional ten days. A return is still due for a quarter with no wages unless you have filed a final return or are a seasonal employer that indicates it on the form.

Deposits are separate from the return

Filing Form 941 is not the same as paying the tax. Employment taxes are deposited electronically on a monthly or semiweekly schedule determined by your lookback period, as explained in Publication 15. The return reconciles those deposits. Late deposits are penalized even when the return itself is on time; see our guide to payroll tax deposits.

The reconciliation that matters

Before signing a 941, we check four things:

  1. Payroll register totals for the quarter equal the wage and withholding lines
  2. Deposits in the bank equal the deposits reported, by date for Schedule B filers
  3. Payroll liability accounts in the books are zero, or show only the current period's undeposited tax
  4. Quarter-to-date totals will roll into year-end W-2s without differences

The fourth check saves the most pain. At year end, the four quarterly 941s must add up to the W-2 and W-3 totals reported to the Social Security Administration. Mismatches trigger correspondence months later.

Correcting a filed return

Errors on a filed Form 941 are corrected on Form 941-X, not by filing another 941. The correction process depends on whether you underreported or overreported tax, and there are time limits.

Smaller employers

Some very small employers are notified by the IRS to file annual Form 944 instead. You should only file Form 944 if the IRS has notified you to do so.

If quarterly filings feel risky, our payroll services include reconciliation before every return.

Key terms

Definitions for terms used in this guide, from our small business glossary:

  • Payroll Register: A payroll register is a report listing each employee's earnings, deductions and net pay for a payroll period.
  • Lookback Period: The lookback period is the 12-month window the IRS uses to decide whether an employer deposits payroll taxes monthly or semiweekly.