Generally the IRS spots this mistake and will send you a tax notice. This could take months or years. If you owe, the IRS will add penalty and interest.
It's better to amend your tax return as soon as you receive your refund. The filing deadline this year is May 17. Depending on the change, you may get an additional refund or you'll have to pay some money back.
How do I amend my 2020 return?
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