The Primary Insurance Amount (PIA) determines your monthly SSDI payment

Your SSDI payment is not a flat amount everyone receives. The Social Security Administration calculates what you get using a formula called the Primary Insurance Amount (PIA), which is based on your actual earnings history. The formula takes your highest 35 years of work income, adjusts those earnings for inflation, and then applies a bend-point calculation that pays a higher percentage of your lowest earnings and a lower percentage of your highest earnings.

The bend points—the dollar thresholds where the payment percentage changes—are adjusted every year. For 2024, the first bend point is $1,174 and the second is $7,078, but these numbers change annually based on national wage trends. Your local Social Security office can tell you the current bend points, or you can find them on the Social Security Administration website under "bend points" for the current year.

The result of this calculation is your Primary Insurance Amount. This is the number Social Security uses to determine not just your payment, but also what your family members can receive if they are on your record.

Key Takeaways

  • Your SSDI payment is calculated from your 35 highest-earning years, adjusted for inflation, then run through a formula with bend points that change every year.
  • The bend-point formula pays you a higher percentage of your lowest earnings and a lower percentage of your highest earnings, which is why two people with different work histories receive different amounts.
  • Your Primary Insurance Amount is the base number; your actual payment may be reduced if you also receive a pension from work where you did not pay Social Security taxes.
  • Family members on your record—a spouse, ex-spouse, or children—can each receive up to 75 percent of your Primary Insurance Amount, but the family maximum usually caps total payments at 150 to 180 percent of your PIA.

How the bend-point formula works in practice

The bend-point calculation has three steps. First, Social Security takes your earnings from each of your 35 highest-earning years and adjusts them for inflation using a national wage index. This means a dollar you earned in 1990 is converted to what that dollar would be worth in the year you turn 60 (or the year you become disabled, if that is earlier). The result is called your Average Indexed Monthly Earnings (AIME).

Second, Social Security applies the bend-point percentages to your AIME. For 2024, you receive 90 percent of the first $1,174 of your AIME, then 32 percent of earnings between $1,174 and $7,078, then 15 percent of earnings above $7,078. If your AIME is $3,000, for example, you would receive ($1,174 × 0.90) + ($1,826 × 0.32) + ($0 × 0.15) = $1,057 + $584 = $1,641 before any reductions.

Third, that number is rounded down to the nearest dime. That rounded result is your Primary Insurance Amount. If you have no other income sources and no family members on your record, this is your monthly SSDI payment.

What happens if you have a government pension

If you worked for a federal, state, or local government and paid into a pension system instead of Social Security—such as the Civil Service Retirement System (CSRS) or certain state teacher or police pension plans—your SSDI payment may be reduced under the Government Pension Offset (GPO) or the Windfall Elimination Provision (WEP).

The Windfall Elimination Provision applies to you if you receive a government pension and are claiming SSDI on your own work record. WEP changes the bend-point percentages used to calculate your PIA. Instead of 90 percent on the first bend point, you receive 40 percent. This can significantly lower your payment—sometimes by hundreds of dollars per month. WEP does not explore if you paid Social Security taxes for 30 or more years, or if your government pension is based on work where you did pay Social Security taxes.

The Government Pension Offset applies if you are claiming SSDI as a spouse or widow based on someone else's record and you also receive a government pension. Your SSDI payment is reduced by two-thirds of your government pension amount. If your pension is $900 per month, for example, your SSDI payment is reduced by $600.

Family member payment amounts and the family maximum

If you are receiving SSDI, your spouse, ex-spouse, or unmarried children under 19 (or up to 22 if in high school full-time) may be able to receive payments on your record. Each family member can receive up to 75 percent of your Primary Insurance Amount. A spouse at full retirement age receives the full 75 percent; a spouse under full retirement age receives less. Unmarried children each receive 75 percent.

However, there is a family maximum. The total amount paid to you and all family members combined cannot exceed 150 to 180 percent of your Primary Insurance Amount. The exact percentage depends on your age and the composition of your family. If the family maximum is reached, Social Security reduces each family member's payment proportionally, starting with the lowest earner on the record.

For example, if your PIA is $2,000 and the family maximum is 175 percent, the total family payment cannot exceed $3,500. If you receive $2,000 and your two children each would receive $1,500 (75 percent of $2,000), that totals $5,000—over the maximum. Social Security would reduce each child's payment so the total comes to $3,500.

How your payment changes over time

Your Primary Insurance Amount does not change once it is set, except for Cost of Living Adjustments (COLA) that Social Security applies each year. COLA is tied to the Consumer Price Index for Urban Wage Earners and Clerical Workers. In years when inflation is low, COLA may be 0 percent. In years of higher inflation, COLA can be 3 percent, 5 percent, or more. Social Security announces the COLA percentage in October for the following year.

Your payment can also be reduced if you earn above the earnings limit while under full retirement age, or if you owe a debt to Social Security or another federal agency. It can be increased if you delay claiming past your full retirement age, though this applies only to retirement benefits, not SSDI.

Frequently Asked Questions

Why do two people with the same work history get different SSDI payments?

They usually do not, unless one of them has a government pension that triggers the Windfall Elimination Provision. If both have identical earnings histories and no government pension, their PIA and payment should be the same. Differences in payment amounts almost always come from different earnings histories or the presence of a government pension.

Can I see what my PIA will be before I claim SSDI?

Yes. You can create a my Social Security account online at ssa.gov and view your earnings record and a payment estimate. The estimate shows what your PIA would be if you claimed at different ages. You can also call Social Security at 1-800-772-1213 and ask for a benefit estimate.

Does my SSDI payment go up if I work while receiving benefits?

No. Your SSDI payment is based on your earnings history up to the point you become disabled, not on work you do after that. However, if you work and earn above the earnings limit, your payment may be reduced or suspended. Once you reach full retirement age, your SSDI converts to retirement benefits and the earnings limit no longer applies.

What is the difference between my PIA and my actual SSDI payment?

Your PIA is the calculated amount based on your earnings history. Your actual payment may be lower if you have a government pension, if family members are on your record and the family maximum applies, or if you owe a debt. Your actual payment is what Social Security deposits into your bank account each month.

Do bend points change every year?

Yes. Bend points are adjusted annually based on the national average wage index. This means the dollar amounts where the payment percentage changes shift each year. Social Security publishes the new bend points in October for the following year, so you can look them up if you want to estimate how a future claim would be calculated.