The tax amount due number TurboTax Premier 2025 computes for my taxable income does not agree with the results from the IRS directions.
The number for my taxable income (line 15) when entered into TT returns a number (line 16) that is significantly different from the number I get when using the formulas provided in the IRS directions. The difference between the TT computed amount and the IRS formulas is in excess of $3,000. The TT number is too low.
I used Microsoft Excel to compute the taxes due amount using the IRS 2025 Tax Computation Worksheet.
I also used my own spreadsheet that computes taxes due that I have used for many years (fairly accurately), adjusted for the 2025 tax brackets, and my spreadsheet agrees, to within pennies, the amount computed from the IRS formulas.
Why is the TT tax amount number so significantly different from the number using the IRS tax formulas?
My filing status is MFJ and I am in the middle of the 24% bracket.
