Your SSDI amount is based on your own earnings record, not on need or disability type

Social Security calculates your SSDI (Social Security Disability Insurance) payment by looking at how much you earned during your working years, not by looking at how disabled you are or how much money you need. The formula is the same one used for retirement benefits—it is tied to your Primary Insurance Amount (PIA), which is what Social Security would pay you at your full retirement age if you had not become disabled.

The amount you receive each month depends on three things: your average earnings over your lifetime, the year you were born (which determines the bend points used in the formula), and whether you have already started collecting retirement benefits. Two people with the same disability can receive very different payments if their work histories are different.

Key Takeaways

  • Your SSDI payment is calculated from your lifetime earnings record, using the same formula Social Security uses for retirement benefits.
  • Social Security uses your highest 35 years of earnings (adjusted for inflation) to find your average monthly earnings, then applies a bend-point formula to calculate your PIA.
  • You can see your estimated payment on your Social Security account at ssa.gov, or request a detailed earnings record by mail.
  • Your payment amount does not change based on how severe your disability is, but it can change if you work while receiving SSDI or if you reach full retirement age.
  • Family members may also receive payments based on your record, which can reduce your own monthly amount if the family maximum applies.

How Social Security uses your earnings history

Social Security looks back at your entire work history and pulls out your 35 highest-earning years (adjusted for inflation to current dollars). If you have worked fewer than 35 years, Social Security counts the missing years as zero. This is why someone who took time out of the workforce—to raise children, care for a parent, or recover from illness—may have a lower SSDI amount than someone with a continuous 35-year record.

The agency adds up all 35 years of adjusted earnings and divides by 420 months (35 years × 12 months) to get your Average Indexed Monthly Earnings (AIME). This is the number that goes into the bend-point formula. If you earned $50,000 per year for 35 years, your AIME would be roughly $4,167 per month (before the formula is applied).

Earnings from self-employment count the same way as wages, but only the net profit (after business expenses) is counted. If you were a contractor or ran a small business, Social Security will use your Schedule C from your tax returns.

The bend-point formula that determines your actual payment

Once Social Security has your AIME, it applies a bend-point formula to calculate your PIA. The formula is progressive—it replaces a higher percentage of low earnings than high earnings. This means someone who earned $20,000 per year gets a larger percentage of their earnings replaced than someone who earned $100,000 per year.

The bend points change every year and depend on the year you were born. For someone born in 1960 or later, the 2024 bend points are $1,174 and $7,078. The formula works like this: you receive 90% of your AIME up to the first bend point, 32% of your AIME between the first and second bend point, and 15% of your AIME above the second bend point. If your AIME is $3,000, you would receive (90% × $1,174) + (32% × $1,826) + (15% × $0) = $1,057 + $584 = $1,641 per month.

The bend points are adjusted each year based on wage growth in the economy. If you were born before 1960, your bend points are different and were set when you turned 60 or became disabled, whichever came first. You cannot recalculate your benefit using newer bend points—the formula that applies is locked in at the time you become may have access to to benefits.

Where to find your estimated SSDI amount

The easiest way to see what Social Security estimates you will receive is to create an account at ssa.gov and view your Social Security Statement. This statement shows your earnings record year by year, flags any errors, and gives you an estimate of what your SSDI payment would be if you became disabled today. The estimate assumes you have worked until the current year; if you plan to work longer, the amount may increase.

If you do not have an online account, you can request a paper statement by mail using Form SSA-7050 (available on ssa.gov), or you can call Social Security at 1-800-772-1213 and ask them to mail you a statement. The paper version takes about two weeks to arrive. You can also visit a local Social Security office in person, though wait times vary by location.

The estimate on your statement is not a may provide of what you will receive—it is based on your current earnings record and assumes you continue working at your recent pace. If you have had years of very low or zero earnings recently, the estimate may be lower than it would be if you had not worked those years (because Social Security uses your 35 highest years, not your most recent years).

How work and age affect your SSDI payment

If you work while receiving SSDI, your payment does not automatically go down—SSDI has no earnings limit like Supplemental Security Income (SSI) does. However, if your work causes Social Security to decide you are no longer disabled, your benefits will stop. The Substantial Gainful Activity (SGA) threshold for 2024 is $1,550 per month in net earnings (or $2,590 if you are blind). Earning above this amount can trigger a medical review.

When you reach your full retirement age (which varies by birth year, typically between 66 and 67), your SSDI payment automatically converts to a retirement benefit of the same amount. The payment itself does not change, but the program name changes and the rules around work incentives shift. After full retirement age, you can earn as much as you want without affecting your benefit.

If you delay claiming SSDI and instead wait until full retirement age or later, your payment will be higher—you receive a delayed retirement credit of about 8% per year for each year you wait past full retirement age, up to age 70. However, if you are already receiving SSDI, you cannot delay to get a higher amount; your benefit is already calculated based on the age you became disabled.

Family payments and the family maximum

Your spouse, ex-spouse, and children under 19 (or 19 if still in high school) may also receive payments based on your SSDI record. Each family member typically receives 50% of your PIA (your spouse or ex-spouse) or 75% of your PIA (each child), but the total paid to your entire family cannot exceed 150% to 180% of your PIA. This is called the family maximum.

If your family maximum is reached, Social Security reduces everyone's payment proportionally. For example, if your PIA is $1,500 and your family maximum is $2,700 (180% of your PIA), and your spouse and two children are also receiving benefits, the $2,700 is divided among all four of you. Your payment might drop from $1,500 to $1,200 so that the total stays within the cap. The family maximum is recalculated if your PIA changes.

What happens if your earnings record has errors

If you notice that your earnings record on your Social Security Statement is missing years, shows lower amounts than you earned, or has duplicate entries, you should report the error to Social Security as soon as possible. Errors are usually caught when you explore for benefits, but fixing them before you explore can prevent delays.

To correct an error, bring your W-2s or tax returns for the years in question to your local Social Security office, or mail copies to Social Security along with a letter explaining the discrepancy. If the error is from a recent year (within the last three years), Social Security can usually correct it quickly. Older errors may require more documentation, especially if the employer is no longer in business.

If you find an error after you have already started receiving SSDI, Social Security will recalculate your benefit retroactively and pay you any back pay owed. This can take several months to process, but you will receive a lump sum for the difference.

Frequently Asked Questions

Can I see the exact calculation Social Security used for my SSDI amount?

Yes. When you view your Social Security Statement online or request one by mail, it shows your earnings record and your estimated PIA. If you want the detailed bend-point calculation, you can request a "detailed benefit calculation" by calling Social Security at 1-800-772-1213 or visiting your local office. They will walk you through the formula and show you which years were used.

Will my SSDI payment go up if I work and earn more money?

Only if you have not yet reached your full retirement age and you have not yet applied for benefits. If you are still working and have not claimed SSDI yet, continuing to earn money may increase your future benefit because Social Security will use your new, higher earnings in the calculation. Once you are receiving SSDI, your payment amount is locked in and does not increase based on new work earnings.

What if I did not work for 35 years?

Social Security counts the missing years as zero earnings. If you worked only 20 years, your AIME is calculated using those 20 years plus 15 years of zeros. This lowers your average and your SSDI payment. However, you may still be insured for SSDI if you have enough recent work credits (usually 20 credits earned in the last 10 years).

Does my SSDI amount depend on how severe my disability is?

No. Social Security determines whether you are disabled or not (you either are or you are not), but the payment amount is based entirely on your earnings record. Two people with the same disability diagnosis can receive very different monthly payments depending on how much they earned while working.

Can I change my SSDI amount after I start receiving it?

No, not directly. Your amount is set based on your earnings record and the bend points in effect when you became may have access to to benefits. The only way it changes is if Social Security discovers an error in your earnings record, if you reach full retirement age (when it converts to retirement), or if you become may be able to access for a higher benefit based on a spouse's or parent's record.