Question: how much of social security is subject to federal tax?
Answer: You'll be taxed on: up to 50 percent of your benefits if your income is $25,000 to $34,000 for an individual or $32,000 to $44,000 for a married couple filing jointly. up to 85 percent of your benefits if your income is more than $34,000 (individual) or $44,000 (couple).