To err on tax returns is human. To forgive is Xtraordinary, and yes, the misspelling is intentional.
Tax law lets us correct mistakes we make on our 1040s via another form, the 1040X.
Most people file 1040X, which is known as amending your return, because they discovered they didn’t claim a tax break that give them a (or a bigger) tax refund.
Of course, since the Internal Revenue Service is involved, there are some rules and certain steps you must follow.
Here are five key things to keep in mind if you discover you need to re-do a previously filed tax return.
Source: 5 amended tax return filing tips