If you can be claimed as a dependent and did not say so when filing your tax return, then you should amend it as your parents would not be able to claim you on their return.
When amending, revisit the My Info section by clicking on My Info on the left of your screen. Read each question carefully.
On the page titled Let's check for some other situations, put a check mark on Another taxpayer can claim me as a dependent on their tax return.
If you are expecting a refund, we recommend that you wait to amend until after the IRS has processed your original return and you have received your refund.
To amend your tax return, please read this TurboTax article.
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