I cannot use turbotax if the calculation is wrong, or if I do not understand the calculation.
Do you have a carryover from last year? Does your w2 contain stock sale information? We can't see your return so it is best if you look at your return to see the forms. Alternatively, you could have a bit of data stuck in your browser.
1.To see your forms:
2. Online version:
A full or corrupted cache can cause problems in TurboTax, so sometimes you need to clear your cache (that is, remove these temporary files).
For stuck information follow these steps: