Tax withholdings from your Social Security are not mandatory, but voluntary. You can request the Social Security Administration to withhold taxes by calling them or by filling out form W-4V.
Please read this SSA document for more information.
Taxes withheld from your Social security checks are then reported in Box 6 of your form SSA-1099.
When entering your form SSA-1099, remember to enter Box 6 - Voluntary Federal Income Tax Withheld and you will get credit for the taxes withheld.
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