Senior deduction

The “senior deduction” is added automatically by the software based on the date of birth and filing status you entered into MY INFO.  You do not need to take any extra steps to enter it. (And…the new senior deduction has nothing to do with whether you are getting Social Security)

The deduction is not on the same line as your standard deduction.  It is shown separately.on line 13b.

2025 STANDARD DEDUCTION AMOUNTS

SINGLE $15,750  (65 or older/legally blind + $2000)

MARRIED FILING SEPARATELY $15,750  (65 or older/legally blind +1600)

MARRIED FILING JOINTLY $31,500  (65 or older/legally blind + $1600)

HEAD OF HOUSEHOLD $23,625 (65 or older/legally blind + $2000)

For 2025 through 2028 there is an extra  deduction amount of up to $6000 per individual 65 or older filing Single, MFJ, or HOH which is phased out for taxpayers with modified adjusted gross income over $75,000 for single filers and $150,000 for joint filers.

(The deduction phases out completely at $175.000 Single or HOH, or $250,000 joint)

The $6,000 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.

IRS Schedule 1-A
https://www.irs.gov/pub/irs-dft/f1040s1a--dft.pdf

Need to see it?

https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-return/preview-turbotax-online-return-filing/L77WCkvnu_US_en_US?uid=m681fkhr

If you are not getting the senior deduction it is because

Your date of birth in MY INFO shows that you were not 65 by the end of 2025

Your income is too high

You are filing married filing separately

Can you post a screenshot of it saying  3,900?

The Standard Deduction for Single is 15,750 + 2,000 for 65 and over and/or  2,000 if blind

See the table 7 on page 25

https://www.irs.gov/pub/irs-pdf/p501.pdf