Hi per960, thank you for your service!
Your military retirement benefits are considered income , which will affect the amount of your social security benefits that are taxable.
The IRS has a worksheet to help you calculate how much of your social security income is taxable if you would like to estimate prior to preparing your tax return; https://www.irs.gov/pub/irs-pdf/p915.pdf
I hope you find this information helpful!
Connie
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