If the repayment is for benefits received in 2020, then you should see the gross benefits for 2020 in box 3 on your SSA-1099, the repayment in box 4, and the net benefits in box 5. You just need to enter the amount from box 5.
If the repayment is for benefits received in a prior year and the amount is less than $3000, you no longer can deduct these as an itemized deduction.
Under the Tax Cuts and Jobs Act (TCJA) that Congress signed into law on December 22, 2017, the deduction has been suspended.
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