Mailing addresses for Forms 941 ; Department of the Treasury Internal Revenue Service Kansas City, MO 64999-0005. Internal Revenue Service PO Box 806532This guide provides the basics of the 941 form, instructions to help you fill it out, and where you can get help meeting all your payroll tax obligations. Overpayment as a nonemployee, file Form 941 for each delinquent quarter. As a business owner (SCorp) I pay monthly tax deposits towards quarterly tax return, form 941. I accidentally overpaid deposit for May 2017. To start, download Form 941-X from the Internal Revenue Service website. For answers to your questions about completing Form 941 or tax deposit rules, you can call the IRS at 18008294933 or 18008294059. This form serves as a crucial tool for businesses to report income taxes, Social Security tax, and Medicare tax withheld from employees' paychecks. Enter the total tax deposits for this quarter, including any overpayment from a prior quarter that you applied as tax payments to this return.