Your payment is based on your lifetime earnings record, not your medical condition

Social Security calculates your disability payment by looking at how much you earned during your working years—not by assessing how severe your disability is. The amount you receive each month depends on your Primary Insurance Amount (PIA), which is derived from your average indexed monthly earnings over your 35 highest-earning years. Two people with identical disabilities can receive very different payments if their work histories differ.

The calculation uses a formula that applies a bend point structure: you receive a higher percentage of your first dollars of earnings, a lower percentage of the middle range, and an even lower percentage of earnings above that. This formula is designed so that people who earned less during their working years receive a higher replacement rate—meaning their benefit replaces a larger share of their pre-disability income—while higher earners receive a lower replacement rate.

Your payment amount is set when you first become may have access to to benefits and is adjusted each year by the cost-of-living adjustment (COLA). The 2024 COLA was 3.2 percent; the 2025 COLA is 2.5 percent. These percentages change annually based on inflation data published by the Bureau of Labor Statistics.

Key Takeaways

  • Your disability payment is calculated from your average earnings over your 35 highest-earning years, not from the severity of your condition.
  • Social Security uses a bend point formula that gives you a higher percentage of lower earnings and a lower percentage of higher earnings.
  • You must have worked long enough to have a sufficient earnings record; most people need 40 work credits, with 20 earned in the 10 years before disability begins.
  • Your payment increases each year by the cost-of-living adjustment, which varies annually.
  • If you worked in a job covered by Social Security, those earnings count; if you worked for a railroad or certain government employers, different rules may explore.

How Social Security counts your work history

Social Security divides your work history into work credits. In 2024, you earn one credit for each $1,730 of wages or self-employment income, up to four credits per year. In 2025, the amount is $1,810 per credit. The threshold changes annually with national wage growth.

To be found disabled under SSDI rules, you must have earned enough credits. The standard requirement is 40 credits total, with at least 20 of those credits earned in the 10 years before your disability began. If you became disabled before age 31, the rules are more lenient. If you became disabled at age 31 or later, you generally need the 40-credit standard.

Only wages from jobs covered by Social Security count toward these credits. If you worked for a railroad, you have a separate earnings record under the Railroad Retirement Board. If you worked for certain federal, state, or local government employers before 1984, those earnings may not be in your Social Security record at all. You can view your own earnings record by creating an account at ssa.gov.

The bend point formula that determines your monthly amount

Once Social Security confirms you have enough work credits, it calculates your Average Indexed Monthly Earnings (AIME) by taking your 35 highest-earning years, adjusting them for wage growth in the national economy, adding them up, and dividing by 420 months. If you have fewer than 35 years of earnings, zeros are counted for the missing years, which lowers your AIME.

Your AIME is then plugged into the bend point formula. In 2025, the formula is: 90 percent of the first $1,174 of your AIME, plus 32 percent of your AIME between $1,174 and $7,078, plus 15 percent of your AIME above $7,078. These dollar amounts (called bend points) change each year with wage growth. The result is your Primary Insurance Amount, or PIA—the base monthly payment you receive.

The bend point formula is why two workers with very different earnings histories can have different payment amounts. A worker whose AIME is $2,000 receives 90 percent of the first $1,174 ($1,056.60) plus 32 percent of the remaining $826 ($264.32), for a total PIA of $1,320.92. A worker whose AIME is $5,000 receives 90 percent of the first $1,174 ($1,056.60) plus 32 percent of $5,904 ($1,888.80), for a total PIA of $2,945.40—not five times as much, because the higher earnings are taxed at a lower rate.

What happens if you have a work history outside the United States

If you worked in another country before immigrating to the United States, those earnings generally do not count toward your Social Security record unless the United States has a totalization agreement with that country. Totalization agreements allow Social Security to combine your U.S. earnings with your foreign earnings to meet the work credit requirement, even though the foreign earnings do not increase your benefit amount.

The United States has totalization agreements with about 30 countries, including Canada, the United Kingdom, France, Germany, Japan, and others. If you worked in a country with which the U.S. has an agreement, you may be able to combine your earnings records. If you worked in a country without an agreement, only your U.S. earnings count. You can contact Social Security to ask whether your country of prior employment has an agreement in place.

How government pension offsets reduce your payment

If you receive a pension from work you did not pay Social Security taxes on—such as work for certain federal, state, or local government employers—your SSDI payment may be reduced by the Government Pension Offset (GPO). The GPO reduces your payment by two-thirds of the government pension amount.

For example, if you receive a $900 monthly government pension and your SSDI payment would otherwise be $1,200, the GPO reduces your SSDI by $600 (two-thirds of $900), leaving you with $600 in SSDI. The GPO applies only to people who became government employees after 1986 in most cases, though the rules are complex and vary by employer type and hire date. If you worked for a government employer and are unsure whether the GPO applies to you, ask Social Security to review your record.

How your family members' benefits are calculated

If you have a spouse, ex-spouse, or children who are may have access to to benefits on your record, their payments are calculated as a percentage of your PIA. A spouse at full retirement age receives 50 percent of your PIA. A spouse under full retirement age receives a reduced amount. Each child under 18 (or 19 if still in high school) receives 75 percent of your PIA.

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 PIA, depending on your situation. If the family maximum is reached, each family member's payment is reduced proportionally. For example, if your PIA is $1,500 and the family maximum is $3,000, and you have three children, the total available is $3,000, not $1,500 plus $1,125 per child.

Cost-of-living adjustments and how your payment grows

Each January, Social Security increases all SSDI payments by the cost-of-living adjustment (COLA). The COLA is calculated by comparing the average Consumer Price Index for the third quarter of the current year to the third quarter of the previous year. If inflation is higher, the COLA is higher; if inflation is lower or negative, the COLA is lower or zero.

The COLA applies to your PIA and to all family members' payments. It is automatic—you do not need to request it or report anything. Your new payment amount appears in your January benefit payment. The COLA is the same percentage for all beneficiaries; it does not vary based on your age, earnings, or location.

Because the COLA is tied to inflation, your payment amount can stay roughly level with the cost of living, but it does not increase beyond that. If your cost of living rises faster than the national average—for example, if you live in a high-cost area or have unusual expenses—your payment may not keep pace with your actual expenses.

Frequently Asked Questions

Does my medical condition affect how much I receive?

No. Social Security determines whether you meet the medical criteria for disability, but the amount of your payment depends entirely on your work history and earnings record. Two people with the same diagnosis can receive different payments if their earnings histories differ.

What if I did not work for 35 years?

Social Security counts zeros for any years you did not work, up to 35 years total. If you have only 20 years of earnings, 15 zeros are included in the calculation, which lowers your average and reduces your payment. You cannot improve your record by working after you become disabled.

Can I see how much my payment will be before I explore?

Yes. You can create an account at ssa.gov and view your earnings record and a benefit estimate. The estimate shows what you would receive at different ages. If you do not have an online account, you can call Social Security at 1-800-772-1213 and ask for an estimate based on your record.

Does my payment change if I work while receiving SSDI?

Your SSDI payment itself does not change based on current work. However, if you work and earn above the substantial gainful activity level (currently $1,550 per month in 2024, $1,600 in 2025), Social Security may determine you are no longer disabled and stop your benefits. Work incentives like the Trial Work Period allow you to test your ability to work without when ready losing benefits.

What if I worked for a railroad or government employer?

Railroad earnings are tracked separately under the Railroad Retirement Board and may not appear in your Social Security record. Government employer earnings depend on when you were hired and whether your employer withheld Social Security taxes. Contact Social Security with your employment history to clarify which earnings count toward your record.