Your SSDI payment is based on your lifetime earnings record, not on how disabled you are or how much you need

Social Security Disability Insurance (SSDI) uses a formula tied to what you paid into Social Security through payroll taxes over your working years. The more you earned and the longer you worked, the higher your monthly payment. This is different from Supplemental Security Income (SSI), which is a needs-based program with strict asset limits. SSDI does not ask whether you are poor — it asks what you contributed.

Social Security calculates your payment by taking your 35 highest-earning years, adjusting them for inflation, and averaging them into a single number called your Primary Insurance Amount (PIA). That PIA is your full SSDI payment at your full retirement age. If you are approved for SSDI before retirement age, your payment stays the same for life, and it converts to a retirement benefit at your full retirement age without changing the dollar amount.

Key Takeaways

  • Your SSDI payment is calculated from your 35 highest-earning years, adjusted for inflation, and averaged into a single number called your Primary Insurance Amount.
  • Social Security uses a three-part formula that applies different percentages to different portions of your average earnings, which is why higher earners see smaller percentage increases.
  • If you have fewer than 35 years of earnings, Social Security counts the missing years as zero, which lowers your average and your payment.
  • Your payment amount does not change based on how severe your disability is or how much money you have in the bank.
  • You can see your exact earnings record and an estimate of your payment by creating a my Social Security account at ssa.gov.

The three-part formula that determines your payment

Once Social Security has your average indexed monthly earnings (AIME), it applies a formula with three separate percentages. The formula bends at two points called bend points, and the percentage applied to each portion of your earnings is different. For 2024, the formula works like this: 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.

This structure means your first dollars of average earnings are replaced at a higher rate than your later dollars. A person who averaged $2,000 per month in earnings gets 90 percent of the first $1,174 (which is $1,056.60) plus 32 percent of the remaining $826 (which is $264.32), for a total PIA of $1,320.92. A person who averaged $6,000 per month gets a much larger payment in dollars, but the percentage of their earnings replaced is lower because more of their income falls into the 32 percent and 15 percent brackets.

The bend points change every year based on national wage growth. Social Security publishes the current bend points on its website each October for the following year. If you are calculating an estimate by hand, use the bend points for the year you turn 62, become disabled, or die — whichever comes first.

How your 35-year earnings history is built

Social Security counts only years in which you earned at least $1,200 in covered wages (this threshold changes yearly). If you worked 40 years but only 30 of those years met the threshold, Social Security counts 30 years of earnings and fills the remaining five slots with zeros. Those five zeros lower your average, which lowers your payment.

Before the formula is applied, Social Security adjusts your historical earnings for inflation using something called indexing. Your earnings from 1990 are not compared dollar-for-dollar to your earnings from 2020 — instead, they are multiplied by a factor that accounts for wage growth over time. This means your early career earnings are brought up to a level that reflects what those wages would be worth in today's economy, making the comparison fair.

If you are still working while receiving SSDI, your recent earnings may replace an older, lower-earning year in your top 35. This can increase your payment, but only if the new year's earnings are higher than the year it replaces. Social Security recalculates your benefit each year in January if your record changed.

Why your payment stays the same even if your disability gets worse

SSDI is an insurance program, not a medical program. Your payment is locked in the month you are approved, based on your earnings history at that time. If your condition worsens, your payment does not increase. If you recover and return to work, your payment does not decrease as long as you stay below the substantial gainful activity (SGA) limit, which is $1,550 per month in 2024 (higher for blind individuals).

The only way your SSDI payment changes after approval is if you return to work and earn above the SGA limit for nine months, which can trigger a work incentive period, or if you reach your full retirement age, at which point your SSDI benefit automatically converts to a retirement benefit for the same dollar amount. Cost-of-living adjustments (COLA) are applied to all SSDI payments each January, but that is a separate increase that affects everyone, not a change to your individual calculation.

What happens if you have gaps in your work history

Gaps in your earnings record hurt your SSDI payment because Social Security uses 35 years whether you worked 35 years or not. If you took time off to raise children, care for a family member, attend school, or deal with illness, those years count as zero earnings in your calculation. A person with 30 years of work history has five years of zeros dragging down their average; a person with 25 years of work history has ten years of zeros.

There is no way to remove or ignore those zero years once you are approved for SSDI. You cannot go back and work additional years to replace them unless you are still in your working years and choose to return to work. If you do return to work, only years that meet the $1,200 threshold will count, and only the highest 35 will be used in your calculation.

How to find your earnings record and estimate your payment

You can see your actual Social Security earnings record by creating a free my Social Security account at ssa.gov. Once you log in, you can view every year of earnings that Social Security has on file, check for errors, and see an estimate of what your SSDI payment would be if you were approved today. The estimate assumes you stop working when ready, so if you are still employed, the actual payment may be different.

If you find an error in your earnings record — a year that is missing, a year with the wrong amount, or a year that should not be there — you can file a correction request through your my Social Security account or by calling Social Security at 1-800-772-1213. Bring your tax returns, W-2 forms, or other pay stubs as proof. Social Security has a time limit for corrections, so report errors as soon as you find them.

If you do not have a my Social Security account, you can request a paper copy of your earnings record by filling out Form SSA-7050-F and mailing it to your local Social Security office. The form is available at ssa.gov/forms. Paper requests take longer than online requests, so creating an account is faster if you have email access.

How family members' payments are calculated

If you are approved for SSDI, certain family members may also receive payments based on your earnings record. A spouse at full retirement age receives 50 percent of your PIA; a spouse under full retirement age receives a reduced percentage. Each child under 19 (or 19 if still in high school) receives 75 percent of your PIA. There is a family maximum — the total amount all family members can receive combined — which is usually 150 to 180 percent of your PIA, depending on your family structure.

If your family maximum is $2,000 and your PIA is $1,200, your spouse and two children cannot each receive their full percentages because the total would exceed $2,000. Instead, Social Security divides the $2,000 among all family members, reducing each person's payment proportionally. This is called the family maximum reduction, and it affects many families with multiple beneficiaries.

Frequently Asked Questions

Does Social Security count self-employment income the same way as W-2 wages?

Yes, self-employment income counts toward your earnings record if you paid self-employment tax on it. You report it on Schedule C of your tax return. Social Security uses your net self-employment income (after business expenses) in the same way it uses W-2 wages. If you were self-employed for many years, make sure your tax returns are filed correctly because Social Security pulls your record from IRS data.

Can I increase my SSDI payment by working more years?

Only if you are still in your working years and have not yet reached your full retirement age. If you return to work and earn enough to meet the $1,200 threshold, a new year of earnings can replace one of your lowest-earning years in your top 35, which increases your PIA. Once you reach full retirement age, additional work does not change your benefit amount. Social Security recalculates your benefit each January if your record changed during the previous year.

What if I worked outside the United States?

Earnings from work outside the U.S. count toward your SSDI benefit only if you paid Social Security taxes on them. If you worked for a U.S. employer or a U.S. government agency abroad, those earnings are included. If you worked for a foreign employer and did not pay U.S. Social Security tax, those years do not count. Bring documentation of your foreign work history when you explore for SSDI so Social Security can verify what counts.

Why is my SSDI payment less than I expected?

The most common reason is years of zero or low earnings in your record. If you took time off work, were unemployed, or had years with very low income, those years are included in your 35-year average and lower your payment. Another reason is that the formula applies different percentages to different portions of your earnings, so higher earners see a smaller percentage of their income replaced. You can review your earnings record on my Social Security to see exactly which years are being counted.

Does my SSDI payment change if I get married or divorced?

Your own SSDI payment does not change. However, if you marry, your spouse may become may be able to access for a spousal benefit based on your earnings record. If you divorce, your ex-spouse may still be may be able to access for a benefit on your record if the marriage lasted at least 10 years and they have not remarried. These are separate payments and do not affect your own benefit amount.