The amount you receive depends on your work history and earnings, not on how severe your condition is

Social Security Disability Insurance (SSDI) and Supplemental Security Income (SSI) calculate payments differently, but neither one bases the amount on medical severity. SSDI looks at what you earned before you became unable to work. SSI looks at your current income and assets. Both programs have a maximum monthly payment, but what you actually receive depends on your specific situation—your age when you started working, how much you paid into Social Security, or how much money and property you own right now.

The key difference: SSDI is an earned benefit tied to your work record. SSI is a needs-based benefit for people with little income or assets. Understanding which program you might receive, and how each one calculates your payment, helps you know what to expect and whether you have other income sources available.

Key Takeaways

  • SSDI payments are based on your lifetime earnings record and what you paid into Social Security, not on how disabled you are.
  • SSI payments are based on your current income and assets, and the federal maximum is lower than SSDI because it is a needs-based program.
  • Your age when you became disabled affects SSDI calculations—workers who started earning earlier typically receive higher payments.
  • Both programs reduce your payment if you have other income, and both have limits on how much you can earn while receiving benefits.
  • Your state may add money to the federal SSI payment, so the total varies by where you live.

How SSDI calculates your monthly payment

Social Security uses your Primary Insurance Amount (PIA), which is based on your highest 35 years of earnings. The formula is not straightforward—Social Security applies a bend point formula that weights earlier earnings more heavily—but the result is a number that represents what you earned over your working life. Your monthly SSDI payment is that PIA amount, adjusted for inflation each year.

The calculation starts with your earnings record. Social Security looks at your wages from age 21 onward, indexes them to account for wage growth over time, and then selects your 35 highest-earning years. If you worked fewer than 35 years, zeros are included in the calculation, which lowers your average. If you worked more than 35 years, only the highest 35 count. The result is your Average Indexed Monthly Earnings (AIME).

Social Security then applies the bend point formula to your AIME. The formula takes a percentage of your first bend point amount (90% in 2024), a smaller percentage of earnings between the first and second bend point (32%), and an even smaller percentage of earnings above the second bend point (15%). The bend points change each year. For 2024, the first bend point is $1,174 and the second is $7,078. This formula means workers with lower lifetime earnings receive a higher percentage of their earnings as a benefit, while higher earners receive a lower percentage.

The maximum SSDI payment in 2024 is $3,822 per month, but most recipients receive less because their earnings history does not reach the level where the maximum applies. The average SSDI payment is around $1,550 per month, though this varies widely based on work history.

How SSI calculates your monthly payment

SSI uses a Federal Benefit Rate (FBR) as its starting point. In 2024, the FBR for an individual is $943 per month. However, your actual payment is the FBR minus any other income you receive. This is the core difference from SSDI: SSI is means-tested, meaning your payment shrinks as your other income grows.

SSI counts most income against your benefit. If you receive wages from work, the first $65 per month is not counted, and then half of the remaining wages reduce your SSI payment. If you receive SSDI, that full amount reduces your SSI payment dollar-for-dollar. If you receive money from family members, pensions, or other sources, those count too. The program also has strict asset limits: $2,000 for an individual and $3,000 for a couple in 2024. Money in the bank, vehicles, property, and other resources count toward this limit. Your home and one vehicle are exempt.

Many states add a supplement to the federal SSI payment. These state supplements vary: some states add $50 to $100 per month, others add more, and a few add nothing. If you live in a state with a supplement, your total SSI payment will be higher than the federal rate. You can find your state's current rate on the Social Security website or by calling your local Social Security office.

What happens if you have both SSDI and SSI

Some people receive both programs. This happens when your SSDI payment is low enough that you still fall below the SSI income limit. Social Security calculates your SSDI first, then checks whether you may have access to for SSI based on your remaining need. Your SSI payment would be the difference between the SSI FBR and your SSDI amount, if any.

For example, if your SSDI payment is $600 per month and the SSI FBR is $943, you might receive $343 in SSI to bring you to the federal minimum (though your state supplement and other income would affect the actual amount). This combination is sometimes called "concurrent benefits," and it is more common among people who became disabled before they had a long work history.

How work affects your payment

SSDI has an Earnings Test that reduces your benefit if you earn above a certain amount. In 2024, you can earn up to $1,550 per month without affecting your SSDI payment. Above that, Social Security deducts $1 from your benefit for every $2 you earn. There is also a Trial Work Period that lets you test your ability to work for nine months without any benefit reduction, and a 36-month Extended Period of may be able to access where you can still receive benefits even if your earnings are high, as long as you report them.

SSI has stricter work rules. The first $65 of monthly earnings and half of the remainder reduce your SSI payment. This means earning $200 per month would reduce your SSI by $67.50. Because SSI is needs-based, any income directly affects what you receive. However, SSI also has work incentives like Plans to Achieve Self-Support (PASS) that let you set aside income and resources for a work goal without losing benefits.

Cost-of-living adjustments and annual changes

Both SSDI and SSI payments are adjusted each year for inflation through a Cost-of-Living Adjustment (COLA). Social Security announces the COLA in October, and the increase takes effect in January. The COLA is based on the Consumer Price Index for Urban Wage Earners and Clerical Workers (CPI-W). In recent years, COLAs have ranged from 0% to 8.7%, depending on inflation.

SSI's Federal Benefit Rate and asset limits also increase with the COLA. State supplements may or may not increase at the same rate—that depends on each state's policy. The bend points used in the SSDI formula also adjust annually, which affects how much new applicants receive but does not change the payments of people already receiving benefits.

Why your payment might be different from someone else's

Two people with the same medical condition can receive very different SSDI payments because their work histories are different. Someone who worked for 40 years at higher wages will receive more than someone who worked for 15 years at lower wages. Age also matters: if you became disabled at 25, your 35-year calculation includes many years of zero earnings, which lowers your average. If you became disabled at 55, more of your working years are included.

For SSI, the differences come from state of residence, current income, and assets. Someone in California receiving SSI gets a higher payment than someone in Mississippi because California has a state supplement. Someone with $500 in the bank receives the full federal rate, while someone with $1,500 in the bank receives less because their assets are closer to the limit.

Neither program adjusts payments based on medical severity, cost of living in your area (except for state SSI supplements), or how much money you need to cover your expenses. The calculation is formulaic, not individualized to your circumstances.

Frequently Asked Questions

Can I increase my SSDI payment by working more now?

No. Your SSDI payment is locked in based on your earnings record at the time you became disabled. Working now does not change your benefit amount. However, if you return to work and your condition improves enough that you no longer may have access to as disabled, your benefits would end. The Trial Work Period and Extended Period of may be able to access let you test work without when ready loss of benefits.

What if I did not work long enough to get SSDI?

You may still receive SSI if your income and assets are low enough. SSI does not require a work history. You can also receive SSDI on a parent's or spouse's work record if you became disabled before age 22 or if you are caring for their child and became disabled before age 16.

Does my payment change if I move to a different state?

SSDI payments do not change when you move. SSI payments may change if you move to a state with a different supplement. Some states have higher supplements than others, so your total payment could increase or decrease depending on where you move to.

How often does Social Security recalculate my payment?

Your SSDI payment is recalculated once per year for the COLA adjustment. It is not recalculated based on current earnings unless you return to work and your case is reviewed. SSI payments can change monthly if your income or assets change, so you must report any changes to Social Security.

What if I think my payment is wrong?

You can request a detailed earnings statement from Social Security to verify your work record is accurate. If you find errors in your earnings history, you can file a correction request. If you believe the calculation itself is wrong, you can ask Social Security to explain how they calculated your amount, and you have the right to appeal if you disagree.