I forgot to claim a deduction on my prior year return. Can I amend prior year return on my return for this year?
You must file an amended 2019 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.
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You can claim the standard deduction or itemize deductions to lower your taxable income. The standard deduction lowers your income by one fixed amount. On the other hand, itemized deductions are made up of a list of eligible expenses. You can claim whichever lowers your tax bill the most.