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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. 

Turbo Tax will not allow me to manually adjust Maine Schedule 1S to include accrued market discount for treasury notes (which is treated as interest on US obligations and should not be subject to state taxes).  Any suggestions?

Using TT Home & Bus 2025 desktop, I find that my Michigan return .pdf file is missing some federal schedules, which, as per MI's state 1040 filing instructions (see Table 3, pg 67) are required.  For my particular situation, I am required to file Fed & MI State tax hardcopy by mail return, so this matters to me.  For my situation, TT does include within the "all forms required for filing" .pdf file:  Sched "C", and Form 8829 (and an "Explanation" memo page for line #37), but does NOT include Sched "1" and Sched "3".  Of course I easily resolved the issue by adding the missing items to my MI 1040 tax return deck, but it seems that Intuit / TurboTax could easily fix this issue.  I vaguely recall that I had this similarly happen last year when using TT Premier desktop.  Please fix the issue, or tell me what I'm doing wrong.  Thanks.