Question

I forgot to claim a deduction on my prior year return. Can I amend prior year return on my return for this year?

Answer

You must file an amended 2020 return using Form 1040X.To claim a credit or credits for a deduction or deductions you failed to claim on an already filed return, you must file your 1040X within the later of:

  • Three years — including extensions — after the date you filed your original return
  • Two years after the date you paid your tax

You can’t e-file a 1040X, so you must mail it to the IRS.

Related Topics

Related Resources

Filing for a Deceased Taxpayer

If you need help handling an estate, we're here to help. Learn how to file taxes for a deceased loved one with H&R Block.

What’s Your Filing Status?

Choosing the wrong filing status is a common mistake. Do you know what your tax filing status is? Read on to learn about filing statuses with H&R Block.

Don’t Overlook the 5 Most Common Tax Deductions

From retirement account contributions to self-employment expenses, learn more about the five most common tax deductions with the experts at H&R Block.

New Baby, New House or New Spouse? How Major Life Changes Affect Your Taxes

Getting married? Having a baby? Buying a house? Go through your life events checklist and see how each can affect your tax return with the experts at H&R Block.