How Social Security Tax Works

Social Security Benefits

Social Security benefit checks run through a printer at a U.S. Treasury facility in Philadelphia, Penn.
Social Security benefit checks run through a printer at a U.S. Treasury facility in Philadelphia, Penn.
William Thomas Cain/Getty Images

To qualify for full Social Security retirement benefits, you need to have at least 10 credits in the Social Security system. How do you earn credits? You earn one for each quarterly period that you work and contribute to the system, but there's a minimum amount you must earn to receive the credit. The amount changes each year. The minimum amount needed to earn a credit in a quarter in 2010 was $1,120. To get the yearly maximum of four credits, you need to have earned $4,480 in 2009. Note that the term "quarter" is somewhat archaic, since the government doesn't count separate quarters anymore. Your income is counted for the entire year, and you get one credit for each $1,120 you earn, up to a maximum of four credits each year. It doesn't matter when in the year you earned that income. If you make $5,000 in January, you'll still get four credits for that year. If for some reason you need to collect Social Security before you have a full 10 credits, you may get some reduced benefits.

How much will you receive in retirement benefits? The amount is first based on your average wages over the 35 years of your life in which you earned the most, adjusted for inflation. It's then adjusted based on when you retire. You can retire as early as age 62, but you'll receive reduced benefits. You have to reach full retirement age to get the full benefits -- this age is between 65 and 67, depending on when you were born. You can even delay retirement beyond full retirement age to get increased benefits [source:].

If you're wondering how many credits you have, the Social Security Administration sends an annual statement to everyone over the age of 25 who has paid into the system. It will explain how many credits you have earned so far, what your benefits would be under your current number of credits and your earnings for each year you've paid into the system. If you're already retired and receiving Social Security benefits, your statement serves another important function: It shows you the exact benefits you received in a given year, which you can use to calculate your combined income.

If you need an extra Social Statement for any reason, you can request one from the Social Security Administration here.

For more information on taxes, please see the links below.

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  • Internal Revenue Service. "Taxable Income for Students." Accessed March 15, 2010.,,id=96674,00.html
  • Social Security Online. "Information about Requesting a Social Security Statement." Accessed March 15, 2010.
  • Social Security Online. "Your Retirement Benefit: How It Is Figured." Jan. 2010, Accessed March 15, 2010.
  • Social Security Online. "Social Security Announces 5.8 Percent Benefit Increase for 2009." Accessed March 15, 2010.
  • Social Security Online. "SSI Annual Statistical Report, 2008." Sept. 2009, Accessed March 15, 2010.