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From USTAXX
Should You Amend an Error in a Previous Tax Filing or Hope the IRS Doesn't Notice?6 steps · Checklist
Amend a return, or leave it alone?
When a correction is worth filing.
Check whether you actually made an error under the rules for that year.
Leave simple arithmetic alone; the IRS corrects it and sends a notice.
Amend on Form 1040-X when income was left off the return.
Amend when a deduction or the filing status was genuinely wrong.
Act before a mismatch notice arrives rather than after.
Weigh the cost of amending against the penalty for an unreported form.
Free, and yours to edit — tick items off on the web or in the MyCheck app.