Complete both pages. Mailing addresses for Forms 941 ; Department of the Treasury Internal Revenue Service Kansas City, MO 64999-0005.Internal Revenue Service PO Box 806532 If you go out of business or stop paying wages to your. If you use a tax preparer to fill out Form 941, make sure employees, you must file a final return. Enter negative amounts using a minus sign (if possible). If you have a credit. Yes, when you make overpayments and voluntary payments, you can request the credits be applied to another year. What can you do if you receive an overpayment notice? This article breaks down everything you need to know about IRS Form 941 and how to complete it with ease.