What is the percentage tax taken out on a social security check?

The percentage tax taken out of a Social Security check varies based on individual circumstances, including total income and filing status. Generally, if a person's combined income exceeds certain thresholds, up to 85% of their Social Security benefits may be subject to federal income tax. However, there is no specific percentage automatically withheld from a Social Security check; individuals can choose to have federal taxes withheld at a rate of 7%, 10%, 12%, or 22% if they opt for withholding. State taxes may also apply, depending on the state.