How SSDI Benefits Are Calculated: The Complete 2026 Guide

If you are applying for Social Security Disability Insurance (SSDI), one of the first questions you will have is: how much will my monthly benefit be? The answer comes from a specific formula the Social Security Administration (SSA) applies to your lifetime earnings record. It is not based on how severe your condition is, how many doctors you see, or how much your household needs. It is based on what you earned and paid into Social Security while you worked.

The Big Picture: Earnings In, Monthly Benefit Out

SSDI works like insurance that you earned through payroll taxes. Two numbers drive the result: your Average Indexed Monthly Earnings (AIME) and your Primary Insurance Amount (PIA). For a disabled worker, the monthly SSDI benefit is the PIA itself. Unlike early retirement benefits, it is not reduced because you are younger than full retirement age. That is also why two people with identical diagnoses can receive very different checks: their work histories are different.

It helps to keep three ideas separate as you read the rest of this guide. First, eligibility (do you have enough work credits and a qualifying medical condition) is decided separately from amount. Second, the amount is calculated only after the SSA decides you are disabled. Third, the figures below are only as accurate as the earnings record behind them.

Step 1: Your AIME

The SSA starts with your earnings history, year by year, as reported on your tax records. Older earnings are indexed, meaning they are adjusted upward to reflect general wage growth, so that a paycheck from many years ago is not treated as worth less than a similar job today. The SSA then selects your highest-earning years, adds up the indexed amounts, and divides by the number of months in those years. The result is your AIME.

For retirement benefits the SSA uses 35 years. For disability, the number of years counted depends on how old you were when your disability began, and younger workers generally have fewer years counted. The SSA makes that determination for you; the practical lesson is that years with little or no earnings pull your average down, and the more of your career you have behind you, the more years of zeros or low earnings can matter.

Step 2: The PIA Bend Point Formula

The SSA applies a progressive formula to your AIME. It replaces a larger share of earnings for lower-wage workers and a smaller share for higher-wage workers. The dividing lines are called bend points, and they are updated every year. They are set by the year you first become eligible, which for SSDI is generally the year your disability begins. The 2026 values are:

Add the three pieces together and round down to the nearest ten cents. That is your PIA. If your disability began in an earlier year, the SSA uses that year's bend points instead, so a figure you see in an older article or an old statement may not match the 2026 numbers here.

Worked Example (Hypothetical)

The following scenario is invented for illustration and does not describe a real person. Suppose a worker's AIME comes out to $3,500 per month:

• 90% of the first $1,286 = $1,157.40
• 32% of the amount between $1,286 and $3,500 ($2,214) = $708.48
• 15% of the amount above $7,749 = $0, because this AIME never reaches that level
• Total = $1,865.88, rounded down to a PIA of $1,865.80 per month

Now suppose a second hypothetical worker with long stretches of part-time or low-wage work has an AIME of $1,000. Everything falls under the first bend point, so the PIA is 90% of $1,000, or $900.00. The second worker earned less than a third as much as the first, yet receives roughly half the benefit. That is the progressive design at work.

For context, the average disabled-worker SSDI benefit is about $1,630 per month, and the maximum benefit for someone claiming at full retirement age is $4,152. Most people with disabilities fall well below that maximum. The tool on our calculator page runs this same arithmetic if you would rather not do it by hand.

What Can Change Your Check After the Formula

Cost-of-Living Adjustments

Benefits are adjusted for inflation each year through a cost-of-living adjustment (COLA), usually announced in the fall and applied in January. The percentage varies by year, so check the current figure on the SSA's COLA information page instead of relying on a number quoted elsewhere.

Workers' Compensation and Public Disability Offsets

If you also receive workers' compensation or certain public disability benefits, your SSDI can be reduced so that the combined total does not exceed a percentage of your earlier earnings (generally 80%). Many claimants are surprised by this. Tell the SSA about any such benefits when you apply, and ask how a settlement is allocated, because the structure of a settlement can affect the offset.

Benefits for Family Members

Certain family members, such as a spouse who meets the SSA's rules or minor children, may receive auxiliary benefits based on your record. Each is a percentage of your PIA, and a family maximum caps the total paid on one worker's record. Family benefits do not reduce your own check.

Working and the Waiting Period

SSDI has a five-month waiting period before the first benefit month, and Medicare generally begins after 24 months of SSDI entitlement. If you work, earnings above Substantial Gainful Activity (SGA) can end eligibility: the 2026 SGA limit is $1,690 per month for non-blind individuals and $2,830 for blind individuals. During a Trial Work Period, a month counts when your earnings exceed $1,210. Our guide to working while on SSDI covers those rules in more detail.

Your primary insurance amount does more than set your own check. It is also the starting point for benefits that a spouse, children or a disabled adult child may receive on your record, each generally up to a share of your benefit and subject to a family maximum. Our guide to SSDI dependent benefits and the family maximum explains who may qualify and how the cap works.

SSI Is Calculated Differently

Supplemental Security Income (SSI) is need-based rather than earnings-based, so the PIA formula does not apply. The 2026 federal benefit rate is $994 per month for an individual and $1,491 for a couple, reduced by countable income. Resources are limited to $2,000 for an individual and $3,000 for a couple. If your SSDI amount is low, you may qualify for a partial SSI payment on top of it, and some states add their own supplement. Browse the state-by-state SSI supplement guide to see how your state treats SSI.

Step-by-Step: Estimating Your Own Benefit

1. 1

   Open your SSA account and review your earnings record

   Create or sign in to your my Social Security account. Compare each year's earnings to your own records, and note any year that looks low or missing.

2. 2

   Use your statement's estimate as a sanity check

   Your statement includes projected benefit amounts, including an estimate for disability. These are estimates, not a decision on your claim, but they give a useful order of magnitude to compare against your own math.

3. 3

   Run the bend point formula

   Enter your average monthly earnings in the calculator or apply the 2026 formula by hand as shown above.

4. 4

   List anything that could trigger an offset

   Workers' compensation, a government pension from work not covered by Social Security, or other public disability payments should be reported up front.

5. 5

   Compare against your real budget

   If the estimate falls short of your expenses, look into whether SSI, state supplements or other assistance can fill the gap, and read about work credit requirements if you are unsure you qualify for SSDI at all.

Common Mistakes When Estimating a Benefit

• Assuming a more serious condition means a larger check. The amount depends on your earnings record, not the severity of the impairment.
• Mixing up SSDI and SSI. Their formulas, income rules and resource rules are completely different.
• Treating an online estimate as a promise. Any calculator, including ours, uses averages you supply. Only the SSA can calculate from your verified record.
• Forgetting the timing. A claim that is approved after a long wait may include back pay, but monthly benefits do not start until after the waiting period.
• Ignoring corrections. If your record has an error, fixing it before a decision is easier than fixing it afterwards.

Frequently Asked Questions

Is my SSDI benefit based on how disabled I am?

No. Your monthly SSDI amount is based on your lifetime earnings record through the PIA formula. Severity of the condition matters for whether you are approved, but not for how much you receive.

Why does my AIME look lower than my recent salary?

AIME averages indexed earnings across many years, including low-earning years and any years with no earnings. A strong recent salary is blended with the rest of your record, so the average is usually below your most recent pay.

Do the 2026 bend points apply to everyone?

Bend points are set by the year you first become eligible, which for SSDI is generally the year your disability begins. Someone whose disability began in an earlier year is calculated using that earlier year's bend points.

Can I get SSDI and SSI at the same time?

Yes, it is possible if your SSDI amount is low enough and you meet the SSI income and resource rules. Your SSDI counts as income when the SSA calculates SSI, so the SSI portion is reduced.

Where can I see my official estimate?

Your my Social Security account at ssa.gov shows your earnings record and benefit estimates. The SSA calculates your actual award from that verified record once your claim is approved.