What is Social Security? A Plain-English Guide

The Social Security system covers most American workers. If you get a W-2 or pay self-employment tax, you're almost certainly in. Your employer takes Social Security tax out of your paycheck, you build a work record, and one day you collect benefits against that record.

A handful of groups are exempt. Railroad workers have their own equivalent system (the Railroad Retirement Board). Some local government employees who pay into an equivalent pension plan don't pay into SSA. Students in work-study programs are out, as are members of religious sects opposed to social insurance, and nonresident aliens. If you're not one of those, you're in.

Social Security is paid for by a 6.2% payroll tax that hits both sides of every paycheck. Your employer takes 6.2% out of your wages, then adds another 6.2% from their own pocket, and forwards both halves to the Social Security Administration. Combined, that's 12.4% of your earnings going into the system.

Self-employed people pay both halves themselves. They owe 12.4% of 92.35% of net business income, collected by the IRS as self-employment tax on Schedule SE. The math is harsher on the surface but the deduction for the employer half evens most of it out.

Social Security tax only applies to the first $168,600 of wages or net self-employment income (the 2024 figure, indexed every year for inflation). Earn more than that and the extra is free of Social Security tax. The maximum tax any single employer can collect from you is $10,453 (6.2% of $168,600).

If you work multiple jobs in the same year and the total wages exceed the cap, each employer keeps withholding as if they were your only one. You end up overpaying. The fix is built into your tax return: claim the excess as a refundable credit on Schedule 3, Part 2, Line 11, which carries to Form 1040, Line 31. You get the overpayment back.

The retirement benefit is what most people think of when they hear Social Security. It's a monthly check that starts when you reach Full Retirement Age (FRA). For anyone born in 1960 or later, FRA is 67. People born earlier have a slightly lower FRA on a sliding scale.

The SSA also pays survivor benefits to widows, widowers, and dependent children of deceased workers, and disability benefits to workers who become permanently and totally disabled before retirement age. All three benefits draw from the same earnings record. The same paycheck taxes that build your retirement check are also building protection for your family and protection if you can't work.

When the SSA talks about "your account," they don't mean a pot of money set aside for you. The account is a ledger of every year you've ever earned a paycheck. To calculate your benefit, they take that ledger and turn it into a number called Average Indexed Monthly Earnings, or AIME.

Here's the math. The SSA takes your annual earnings for every year through age 60 and applies an inflation index so a dollar earned in 1985 counts like a dollar earned today. They then pick your highest 35 indexed years, add them all up, and divide by 420 (the number of months in 35 years). If you worked fewer than 35 years, they fill the missing years with zeros, which drags AIME down.

AIME gets fed into a three-bend formula to produce your Primary Insurance Amount (PIA), which is your monthly benefit at Full Retirement Age. The formula in 2024 is:

90% of the first $1,174 of AIME, plus 32% of AIME between $1,174 and $7,078, plus 15% of AIME above $7,078.

The percentages drop as AIME climbs, which is why the system is progressive: lower earners get a much higher replacement rate than high earners. A worker with an AIME of $3,300 ends up with a PIA around $1,738. A worker with an AIME of $8,300 ends up with a PIA around $3,128, even though they earned more than 2.5 times as much over their career.

You can start collecting retirement benefits as early as age 62, but the benefit is permanently reduced. Claim at 62 and you get 70% of your PIA - a 30% haircut for the rest of your life. Claim at FRA (67 for most people) and you get 100%. Delay past FRA and the SSA adds 8% per year up to age 70, a 24% bonus over your PIA.

The video uses a worker named Marvin with a PIA of $3,128 as an example. At 62, he'd get $2,502 per month. At 67, he'd get $3,128. At 70, he'd get $3,878. Over a 25-year retirement, those numbers compound dramatically. The right choice depends on health, life expectancy, whether you'll keep working, and whether you have other income to bridge the gap until 70.