Step 1 of 7 · The return and the employer
Report wages, tips, federal income tax withheld, and Social Security and Medicare taxes for the quarter. Figures are computed by your payroll system; this form records and files them.
Correcting a quarter you already filed? That is Form 941-X, a separate return.
This site sends returns to the IRS test system, which also takes a quarter that has not ended, so every quarter can be chosen here.