How Are SSDI Payments Calculated? A Comprehensive Guide

Reviewed May 2026

Your monthly SSDI payment is based on your lifetime earnings, not on the severity of your disability. The Social Security Administration uses a three-step formula: it adjusts your past earnings for inflation to find your Average Indexed Monthly Earnings (AIME), applies a tiered percentage formula to derive your Primary Insurance Amount (PIA), then applies any cost-of-living adjustments. Use the calculator below for a quick estimate, then read on for a full breakdown of how SSA arrives at that number.

The 2026 SSDI numbers you should know

Before we walk through the formula, here are the figures that matter for 2026:

Figure	2026 amount
Maximum retirement benefit at full retirement age (SSA example)	$4,152
Average monthly SSDI benefit	$1,630
Cost-of-living adjustment (COLA)	2.8%
First bend point	$1,286
Second bend point	$7,749
Substantial Gainful Activity (SGA) — non-blind	$1,690 / month
Substantial Gainful Activity — blind	$2,830 / month
One quarter of coverage	$1,890 in earnings

SSA identifies $4,152 as the 2026 retirement benefit at full retirement age in its maximum-earnings example. That retirement benchmark should not be treated as a universal SSDI ceiling. For your disability benefit estimate, use your actual earnings record in your my Social Security account.

How SSDI is calculated: the three-step formula

SSA's calculation has three core steps. The math behind it is intricate, but the logic is straightforward.

Step 1: Average Indexed Monthly Earnings (AIME)

SSA uses your Social Security-covered earnings record to calculate Average Indexed Monthly Earnings, or AIME. Past earnings are generally adjusted for national wage growth. For disability benefits, the number of years used depends on when disability began and the disability dropout rules; it is not automatically a 35-year calculation.

SSA averages the selected earnings over the required computation months and rounds AIME down to a whole dollar. A shorter work history does not automatically mean SSA adds zeros until it reaches 35 years. See SSA's disability earnings-calculation rules.

Step 2: Primary Insurance Amount (PIA)

SSA splits your AIME into three brackets using two thresholds called bend points. For 2026:

Portion of AIME	Multiplier
First $1,286	90%
Between $1,286 and $7,749	32%
Above $7,749	15%

The three results are added together to give your Primary Insurance Amount (PIA). The 90/32/15 percentages are fixed by federal law and do not change. Only the bend point dollar amounts are adjusted each year.

Step 3: Apply COLA and any offsets

Once SSA calculates your PIA, it applies any annual cost-of-living adjustments that have accumulated since you became eligible. The 2026 COLA is 2.8%. SSA may also apply offsets — for example, if you receive workers' compensation or certain public disability benefits, your SSDI may be reduced so that the combined total doesn't exceed 80% of your pre-disability earnings.

A worked example using 2026 numbers

Let's say your AIME comes to $4,000/month. Your PIA calculation looks like this:

• First $1,286 × 90% = $1,157.40
• Remaining $2,714 (from $1,286 to $4,000) × 32% = $868.48
• Total PIA = $1,157.40 + $868.48 = $2,025.88

So a worker with an AIME of $4,000 in 2026 would receive a PIA of approximately $2,026/month. That's the baseline — actual benefits may be slightly higher or lower after COLA and any offsets are applied.

The higher your AIME, the lower the marginal replacement rate. This is the "progressive" structure of the SSDI formula — it replaces a higher percentage of income for lower earners than for higher earners.

SSDI vs SSI: different programs, different math

Many people confuse SSDI and SSI. Both are administered by the Social Security Administration, but they're calculated entirely differently.

	SSDI	SSI
Based on	Your earnings history	Financial need
Eligibility	Work credits + disability	Limited income/resources + disability or age 65+
Funding	Social Security payroll taxes (FICA)	General federal tax revenue
2026 monthly maximum	Based on covered earnings and applicable benefit rules	$994 individual / $1,491 couple
Benefit calculation	AIME + PIA formula above	Federal Benefit Rate minus countable income

Some claimants qualify for both — this is called concurrent benefits. It typically applies when a worker has limited earnings history (so their SSDI payment is low) and limited resources (so they're also eligible for SSI to fill the gap).

Why your benefit might be lower than the calculator estimates

The calculator above gives a rough estimate based on simplified inputs. Your actual benefit may differ for several reasons:

• Years with no earnings. Any year before age 22 or any gap year (caregiving, school, unemployment) counted as a zero brings your AIME down.
• Workers' compensation offset. If you receive WC for the same condition, your combined benefits cannot exceed 80% of your pre-disability earnings.
• Public disability offset. Certain state and local government disability pensions trigger similar reductions.
• Benefits for family members. A disabled worker's family maximum is generally 85% of AIME, with a floor of the worker's PIA and a ceiling of 150% of PIA. This limits the combined benefits payable on the record and can reduce auxiliary payments to family members. See SSA's disabled-worker family maximum.
• Garnishment. SSDI can be garnished for child support, alimony, federal taxes, and certain federal student loan defaults.

How to get an exact figure from SSA

The most accurate way to see your projected SSDI is through SSA itself. You can:

• Sign in to your my Social Security account at ssa.gov/myaccount and view your personalized benefit estimate. This uses your actual earnings record on file with SSA.
• Use SSA's online benefit calculators at ssa.gov/benefits/calculators for various scenarios.
• Call SSA at 1-800-772-1213 (TTY 1-800-325-0778), Monday–Friday 8am–7pm.

Watch for the SGA limit if you're working

If you're still working while applying for SSDI, your earnings matter more than just for the AIME calculation. SSA uses a separate threshold called Substantial Gainful Activity (SGA) to decide whether you're engaging in enough work to disqualify yourself from disability benefits.

For 2026:

• $1,690 / month for non-blind claimants
• $2,830 / month for claimants who are statutorily blind

If your gross monthly earnings exceed those amounts, SSA may deny your claim regardless of your medical evidence. This is one of the most common — and avoidable — reasons applications are denied. A disability attorney can help you understand how to manage work activity during the application process, including impairment-related work expense (IRWE) deductions and unsuccessful work attempts.

The bigger challenge isn't calculating your benefit — it's getting approved

SSDI calculations are complicated, but the math is the easy part. The hard part is the approval process itself:

• Most initial applications are denied. Roughly two-thirds of initial SSDI applications nationwide are denied at the first level.
• Colorado hearing wait times exceed 12 months. If you're denied at the initial application and reconsideration stages, the wait for a hearing in Denver, Colorado Springs, or Albuquerque can be over a year.
• Approval rates vary widely by judge. Individual SSDI judge approval rates in the 2026 SSA dataset range from under 10% to over 90%, even for the same hearing office.
• Strong cases get denied for procedural reasons. Missing medical records, inadequate function reports, and incorrect work history all sink otherwise meritorious claims.

This is where an experienced disability attorney makes a measurable difference. Viner Disability Law represents disabled workers across Colorado at every stage of the SSDI and SSI process — from initial application through hearing, Appeals Council, and federal court if necessary. Initial consultations are free, and we don't get paid unless you win your case.

Call (720) 515-9012 or contact us online to talk through your situation.

Frequently asked questions

Is the $4,152 retirement benchmark my SSDI maximum?

SSA's $4,152 example describes retirement at full retirement age, not a personal disability calculation. Your SSDI amount depends on your covered earnings and applicable benefit rules. Check SSA's estimate using your actual record rather than treating that retirement figure as a universal disability ceiling.

Did the SSDI formula change in 2026?

The structure of the formula did not change. The 90% / 32% / 15% percentages are fixed by federal law. What changes annually are the bend point dollar amounts ($1,286 and $7,749 for 2026), the COLA (2.8% for 2026), the SGA threshold ($1,690 for 2026), and the taxable maximum ($184,500 for 2026).

How does the 2026 COLA affect my benefit?

The 2.8% COLA increased benefits starting January 2026. For the average SSDI recipient, that's about $44 more per month. The actual increase depends on your individual benefit amount.

Can I work and still receive SSDI?

Yes, within limits. If you're already approved for SSDI, you have a nine-month Trial Work Period ($1,210/month threshold in 2026) where earnings don't affect your benefit. After that, you enter an Extended Period of Eligibility, and benefits continue in any month where you earn below SGA ($1,690 for 2026).

Why is my benefit estimate lower than I expected?

Common reasons: years with low or zero earnings (especially before age 22 or during caregiving gaps), inflation indexing producing different numbers than your actual paycheck history suggests, and the progressive formula replacing a smaller percentage of higher earnings. The estimate from your my Social Security account is more accurate than any calculator because it uses your actual earnings record.

This article provides general information about how SSDI is calculated under federal law. Bend points, COLA, SGA, and other figures are official SSA values for 2026. This is not legal advice. For advice specific to your situation, contact an attorney or your local Social Security office.