How to Report Unpaid Taxes
- 1). Go to the IRS website. Download and print Form 1040X, Amended U.S. Individual Income Tax Return.
- 2). Fill out Form 1040X carefully, making sure to list the additional taxable income. You will have to recalculate your total income to reflect this additional amount.
- 3). Calculate the total amount of taxes you owe based on your new total income figure. Subtract the amount of taxes you have already paid and the amount remaining is the amount you owe the IRS for your originally unreported income.
- 4). Sign and date the completed Form 1040X. Make sure to include a check or money order for the additional taxes owed before you seal it, stamp it and mail it to the nearest IRS service center.