The portion of your social security benefits that is taxable varies with your income level. If your total income is between $25,000-$34,000 for an individual or $32,000-$44,000 for a married couple filing jointly, you must pay up to 50% of federal income taxes on your Social Security benefits. If your total income is higher than $34,000 for an individual or $44,000 for married filing jointly, then up to 85% of your benefits may be taxed.
The IRS has on online tool that can help you calculate how much of your social security is subject to taxation.
