Your annuity amount makes your Social Security 85% taxable, so $17,911 of your $21,072 will be added to your other income. You should see this on Form 1040, Line 6a/6b.
Look at your Form 1040, Line 15 to see the amount of Taxable Income. This is your income, less the Standard or Itemized Deduction.
Then look at the amount of Tax on Line 18. Is this amount 10%, 15% or 20% of the amount on Line 15?
If you have other credits/additions, they show on Lines 19-23. Your Total Tax is on Line 24.
This will give you an idea of how much tax you could withhold on your Social Security.
There are a couple ways you could handle this. If you are withholding tax on your annuity (which would be advisable), you could increase your withholding there (if you owe tax) so that you may not need to also withhold on your Social Security.
Any current withholding on your annuity shows on Line 25b and reduces your Total Tax. Compare the amount on Line 33 (Total Payments) to the Total Tax on Line 24. If you owe tax, increasing your annuity withholding could wipe out tax owed, so you would not need to withhold tax on your Social Security.
If you want to leave the withholding on your Annuity as is, then have tax withheld from your Social Security in the % as discussed above.
Hope this helps!
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