Got AL state penalty even I applied last year's (2023) refund to this year(2024)

[nbadhe2020]

I have used TT business and after entering all my income and stock gains, TT is showing 1200$ under payment penalty but I did applied last year's (2023) refund to this year(2024) tax as estimated tax. Because I had refund from last year , I didn't make any additional estimated tax payments on those 4 dates. Due to stock gains my income increased so AL included more income than 2023 which is valid but I am not sure why was I charged penalty of 1200? how it was calculated? Is there a worksheet that shows the under penalty calculation?

some more details - last year refund of 7K applied to 2024 tax. Last year, TT didn't give me any estimated tax that I need to pay for this year - 2024.

Thanks for help.

[AmyC · Accepted solution]

The 2210AL calculates the underpayment penalty. You have an underpayment penalty if you paid less than the lower of 90% of the previous year's taxes (2023) or 100% of the 2022 taxes.

You can choose the regular method or annualized income to reduce your liability.

To print or view  your forms, including all worksheets:

• In desktop, switch to Forms Mode. 
• For online:
  1. On the left side, select  Tax Tools
  2. Select Print center
  3. Select Print, save or preview this year's return
  4. If you have not paid, select pay now.

[nbadhe2020]

Thanks for quick answer and it does make sense but when I filed 2023 taxes why TT didn't calculate estimated AL state tax for 2024 ? If it had calculated I would have paid those estimated tax.