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From the IRS :  https://www.irs.gov/taxtopics/tc308

If you discover an error after filing your return, you may need to amend your return. The IRS may correct mathematical or clerical errors on a return and may accept returns without certain required forms or schedules. In these instances, there's no need to amend your return.

However, do file an amended return if there's a change in your filing status, income, deductions, or credits.

Don't forget that when you mail a paper return to the IRS, you must include copies of your W-2s and 1099s, plus you need to sign and date the return.