If you filed your own tax return last year but said you could be claimed as a dependent, you have an AGI on line 11 of your 2024 Form 1040. If by "filed under my mother " you just mean your mom claimed you as a dependent and you did not file a return of your own at all, then choose the answer that says you did not file a 2024 return, or use zero as your AGI.
And....if you were under the age of 19 at the end of 2025 (or if you were a full-time student in 2025), you can still be claimed as a dependent on your parents' tax return so make sure that in MY INFO you said someone else can claim you for 2025.
**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.**