You can amend your 2021 tax return and claim your daughter as a dependent if:
- She is your child or stepchild
- Under age 19 or under age 24 if full time student
- Did not provide more than 1/2 of her own support
- Does not file a joint return with someone else
- Is a US citizen, US national, US resident alien or resident of Canada or Mexico
- Lived with you for more than 6 months during the year
If you meet the above tests, received the refund claimed on your original return and your daughter's amended return has been filed and tax paid you can file an amended return for 2021 within three years after the date you timely filed your original return.
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