How Far Back Can You Amend Tax Returns?

How Far Back Can You Amend Tax Returns?
A pen next to an income tax form.

What To Report

The IRS does not require an amendment if you want to correct math errors or if you have forgotten to attach certain schedules. The agency will redo the math and send you a note if it requires missing forms. Amendments are necessary if you want to report changes in your status, income, deductions or credits.

How Much Time You Have To File

The three years starts when you were required to file your return. If you filed early, time does not start until the actual due date, usually around April 15. If you received an extension to file, time starts with the extended due date. If you owed tax, your amended return is due two years after you paid the tax or three years from the original return due date, whichever is later.