Social Security benefits are normally taxed at a maximum of 85% on your Federal return, unless you are using the Married Filing Separate filing status.
The number being taxed on your return, $17,935, is 85% of the total Social Security benefits you entered.
Here is a link to the Social Security Administration web site that will give you some good information about what amount of your Social Security benefits may be taxable: Benefits Planner - Income Taxes and your Social Security Benefit
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