Social Security Benefits - Form 1099-SSA Box 3
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An amount appearing in Box 3 of IRS Form SSA-1099, Social Security Benefit Statement, would not be entered in the TaxAct program in Box 5. Box 5 on the form is the Net Benefits for the current year and has already taken the amount from Box 3 into account.
For steps on how to enter or review information from Form SSA-1099 (Social Security Benefits) or Form RRB-1099 (Railroad Retirement Board Social Security), see the FAQ Forms SSA-1099 and RRB-1099 - Entering Social Security or Railroad Retirement in Program.

An example of Form SSA-1099 is available in IRS Publication 915.