Where can you get telephone help? The IRS uses Part 2 of Form 941 to calculate your tax liability for each month of the quarter.For overpayments: Employers correcting an overpayment must use the corresponding "X" form. If you hire employees and held onto some of their paycheck for tax payments, you'll need to file Form 941. Here's how to file it properly. In this video we're going over how to file form 941 the employer payroll tax form that you need to fill out quarterly for your employees. • Lines 7a through 7c of Form 941. Click here to search for any overpayments on your PIN.