TurboTax seems to be using AGI instead of MAGI for Senior tax credit in form Schedule 1-A

Forum|Forum|5 months ago
January 10, 2026
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[Schedule 1-A] line 1 MAGI amount is the same as AGI amount on [1040/1040SR Wks] line 11 (AGI)

I believe Schedule 1-A (MAGI) should be same [Mod AGI Wks] MAGI ?

Best answer by VolvoGirl

No. The top section of Schedule 1-A is TO CALCULATE the MAGI for Schedule 1-A. There are many many different MAGI calculations. The MAGI is different for everything. The MAGI worksheet you see in your return is for something else.

VolvoGirl

Level 15

There are different MAGI for different things.

The maximum deduction is $6,000 for each person 65. The phaseout is 6% of the amount by which MAGI exceeds $75,000 for single or $150,000 for married filing jointly (MFJ). The MAGI is normally the same as your AGI but with some Foreign items from Form 2555 added back in. On a joint return the phaseout is calculated separately for each person, so the 6% phases out for each spouse. This deduction is intended to provide tax relief for seniors and is in addition to the existing Standard Deduction or your Itemized Deductions. Expires December 31, 2028.

The 6,000/12,000 senior deduction will be calculated on 1040 Schedule 1-A page 2 Part V Enhanced Deduction for Seniors which goes to 1040 line 13b. It is separate and in addition to the Standard Deduction or your Itemized Deductions on 1040 line 12e. Turbo Tax automatically includes it if you qualify.

1040 Schedule 1-A, page 2 Part V Enhanced Deduction for Seniors

https://www.irs.gov/pub/irs-pdf/f1040s1a.pdf

I also made a spreadsheet to show the calculations.