Will you or him have any other income? Your Social Security will be 100,000? If you only have SS it is not taxable and you don't need to file a return.
Up to 85% of Social Security becomes taxable when all your other income plus 1/2 your social security, reaches:
Married Filing Jointly: $32,000
Single or head of household: $25,000
Married Filing Separately: 0
To see the Social Security Benefits Calculation Worksheet in Turbo Tax Online version you would have to save your return with all the worksheets to your computer. Or if you are using the Desktop CD/Download Software you can switch to Forms Mode (click Forms in the upper right) and click on SS in the list on the left side.
Is your Social Security taxable?
https://ttlc.intuit.com/community/income/help/is-my-social-security-income-taxable/00/25600
IRS Pub. 915 on Social Security. There is a blank worksheet on page 16
https://www.irs.gov/pub/irs-pdf/p915.pdf
The taxable amount of Social Security is a range.
For Single between $25,000 and $34,000, you may have to pay income tax on up to 50 percent of your benefits. For more than $34,000, up to 85 percent of your benefits may be taxable.
For Joint between $32,000 and $44,000, you may have to pay income tax on up to 50 percent of your benefits. For more than $44,000, up to 85 percent of your benefits may be taxable.
See,
Benefits Planner | Income Taxes And Your Social Security Benefit | SSA
