If your calculation and TurboTax are using the same taxable income, is the difference in the amount of tax calculated from that income or the amount of withholdings and credits that reduce the tax?
By figuring that out, we might be able to see if TurboTax is applying different tax rates to your income, either due to the long-term capital gains or qualified dividends @DoninGA mentioned or if there is an additional credit on your return that you did not account for.
Another source of difference could be a data entry error on the withholdings. You can preview the 1040 TurboTax has generated and see if there are any additional credits or withholdings that you did not account for:
- Open or continue your return.
- Select Tax Tools in the left menu (if you don't see this, select the menu icon in the upper-left corner).
- With the Tax Tools menu open, you can then view your 1040 form: Select Tools. Next, select View Tax Summary in the pop-up, then Preview my 1040 in the left menu
- The second page of Form 1040 will have the information pertaining to your credits and withholdings. If you see an amount on Line 20, Amount from Schedule 3 Line 8 or Line 31, Amount from Schedule 3, line 15, you can continue to scroll down to Schedule 3 to see what those exact credits are.
