That depends. Taxation of social security benefits is based upon combined income of both you and your spouse (if you have a spouse)- as calculated by adding your adjusted gross income plus nontaxable interest earned plus one-half of your social security benefits.
If you file a federal income tax return as an individual with a combined income between $25,000 and $34,000 - 50% of your social security benefits are subject to income tax. If your combined income exceeds $34,000 - 85% of your social security benefits are subject to income tax.
If you and your spouse file a joint income tax return - 50% of your social security benefits are subject to income tax if your combined income is between $32,000 and $44,000. If your combined income exceeds $44,000 - 85% of your social security benefits are subject to income tax.
If you are married filing a separate income tax return, you might have to pay income tax on your entire social security benefit.