Don't freak out, consider whether or not you need to file an amended return.
Should I file an amended tax return?
You've meticulously filled out and submitted your taxes. But there was still a mistake (or two) OH NO!
Don't freak out.
First-- what sort of mistake was it?
If it was...
A. a math error
B. you forgot to attach a form or schedule
Then you don't need to file an amended return. The IRS can fix simple math errors. And if they need a form from you, they will send a letter asking for it.
If it was...
If there was a change of:
Then yes, you should file an amended return.
You can check whether you should re-file with this IRS tool: click here
How to file an amended return-
You will need to fill out a 1040X to amend your tax return.
Here is an IRS with answers to frequently asked questions: click here
Here is a link to the 1040X form: click here
4 Things to keep in mind when amending a return-
1) make sure you label which year's tax return you are amending
2) If you're amending more than one tax return- you must file each amendment individually
3) If you're filing your amendment for an additional return- wait until you get your first return amount before filing again
4) Don't amend your return because of math errors, the IRS can fix those themselves