When the IRS has fully processed your return---you can amend.
See this TurboTax support FAQ for amending a tax return - https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-return/amend-change-correct-return-a...
When you amend you will go to My Info. Click your name and go through the screens to the question that asks if you can be claimed as someone else's dependent. You need to say YES.
Do not expect quick results from amending. It can take four months or more for the IRS to process an amended return.
You can watch for information here:
https://www.irs.gov/Filing/Individuals/Amended-Returns-(Form-1040-X)/Wheres-My-Amended-Return-1
And.....hopefully you will not make this mistake again if your parent(s) can claim you next year. If you make this mistake and file first--before your mom--here is what happens:
If you can be claimed as a dependent and you answer the question in My Info incorrectly, here is what happens if you e-file first: Your Social Security number goes into the IRS system as having been used. When your parents try to e-file, their e-file is rejected and they will find it impossible to e-file their own tax return. Then they will have to print, sign and mail their return and wait for months for it to be processed. You, meanwhile, will have to file an amended tax return on a special form called a 1040X, which also takes months for the IRS to process. So make sure you know the correct answer to "Can anyone claim you as a dependent on their tax return?"
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
