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Determining Taxable Amount. If your base income exceeds the limit for your filing group, you'll have to pay taxes on some of your Social Security benefits. If you're a single filer and your base income is between $25,000 and $34,000, you'll have to pay tax on up to 50 percent of your Social Security benefits.
The formula that determines the taxation of benefits applies to everyone, regardless of age. If you look at a 1040 tax form you will see two boxes; box 20a for total Social Security benefits, and box 20b, for the taxable amount. Here's how the taxable amount is determined.