See my answer on your other post.
https://ttlc.intuit.com/community/taxes/discussion/turbotax-2025-is-incorrectly-calculating-taxable-...
Do you have an amount on line 41e for the Senior Deduction? If you have a high income you do not get the 6,000 or 12,000 subtracted. I see the 12,000 shows up on my What-If in columns 2-4 but is not subtracted because line 40 income is over the max.
For Single the deduction starts to phase out at 75,000 and maxes out at 175,000
For Joint the deductions starts to phase out at 150,000 and maxes out at 250,000
