I reported 24k cares act disaster distribution in 2020 with tax 3yr repayment. This year TT calculated my payment to be 1/3 of 24k to be 16k. Doesn't seem correct. Is it?

Yes, if you spread it over 3 years then it should be $8,000. Please verify that you have the box checked next to "If this was a Coronavirus-related distribution reported in 2020 check here". Then make sure you enter the amount from Form 8915-E, line 9 twice (if it was not from an IRA) or enter the amount from Form 8915-E, line 17 twice (if it was from an IRA). The amount on line 9 or 17 should be $8,000 if your Form 8915-E was filed correctly.

Please review your entries:

1. Click on the "Search" on the top and type “1099-R”  
2. Click on “Jump to 1099-R” 
3. If you do not have any 2021 1099-R answer "No" to "Did you get a 1099-R in 2021?" (If you have any other 1099-R then enter all 1099-R and after entering your last 1099-R click "Continue" on the “Review your 1099-R info​​​​​​​” screen)
4. Answer "Yes" to the "Have you ever taken a disaster distribution before 2021?" screen
5. Follow the instructions on the screen