How Do I Calculate Social Security Disability Benefits

Use this SSDI calculator to estimate a monthly disability benefit based on your Average Indexed Monthly Earnings, your calculation year, and any monthly public disability offset you want to subtract. The formula shown here follows the Social Security primary insurance amount method used to estimate disability benefits for workers.

SSDI Benefit Calculator

Enter your estimated Average Indexed Monthly Earnings (AIME). If you do not know it, you can still use this tool for a close estimate once you calculate your indexed career average.

Benefit Formula Visualization

This chart shows how your estimated benefit is built from the Social Security formula tiers. The first tier gets the highest replacement rate, then the second tier, then the third tier.

• Tier 1 replaces 90% of the first bend point amount.
• Tier 2 replaces 32% of earnings between bend points.
• Tier 3 replaces 15% of earnings above the second bend point.

Expert Guide: How Do I Calculate Social Security Disability Benefits?

If you are asking, “how do I calculate Social Security disability benefits,” the short answer is that Social Security Disability Insurance, or SSDI, is generally based on your prior covered earnings, not on the severity of your medical condition alone. Your medical condition must qualify you for disability, but your payment amount is usually determined by the same core formula used to calculate a worker’s primary insurance amount. That means the Social Security Administration looks at your earnings history, indexes many of those wages for wage growth, computes your Average Indexed Monthly Earnings, and then applies a three-part formula using yearly bend points.

Many people are surprised to learn that SSDI is not a flat amount. Two workers with the same diagnosis can receive different monthly benefits because they earned different amounts over their careers. In practice, there are really two separate questions. First, do you medically and technically qualify for disability benefits? Second, if you qualify, what will your monthly payment be? This calculator addresses the second question by estimating the monthly SSDI amount after you enter your AIME and the applicable year.

Important: SSDI is different from Supplemental Security Income, or SSI. SSDI is based on work history and payroll taxes. SSI is a needs-based program with income and resource limits. If you are trying to estimate SSDI, focus first on your earnings record, work credits, and AIME.

Step 1: Confirm you are looking at SSDI and not SSI

Before doing any math, make sure you are calculating the correct program. SSDI is an insurance benefit for workers who paid Social Security taxes long enough and recently enough. SSI is a separate federal program for people with limited income and limited resources. Someone can qualify for one or both, but the benefit calculations are very different.

• SSDI: Based on covered earnings and work credits.
• SSI: Based on financial need, federal benefit rates, and countable income.
• Concurrent benefits: Some people receive a small SSI payment to supplement a low SSDI benefit if they meet SSI financial rules.

Step 2: Make sure you meet the work credit rules

To receive SSDI, you typically need enough work credits and enough recent work. In many cases, a worker age 31 or older needs at least 20 credits earned in the 10 years before disability began, though younger workers can qualify with fewer credits. You earn credits based on annual wages or self-employment income that were subject to Social Security tax.

Year	Earnings Needed for 1 Credit	Maximum Credits per Year	Non-Blind SGA per Month	Blind SGA per Month
2024	$1,730	4	$1,550	$2,590
2025	$1,810	4	$1,620	$2,700

These figures come from Social Security program updates and are useful for checking work credit accumulation and substantial gainful activity levels.

If your current work activity is above the substantial gainful activity level, that does not automatically mean you can never qualify, but it is a very important threshold in disability claims. The calculator above compares your current monthly earnings to the selected year’s SGA amount to give you a practical eligibility signal.

Step 3: Understand Average Indexed Monthly Earnings, or AIME

The most important number in an SSDI benefit estimate is your AIME. Social Security does not simply average all of your paychecks. Instead, it generally takes your covered earnings over time, indexes many prior years to reflect national wage growth, selects your highest earning years under the applicable computation rules, totals them, and converts them into a monthly average. That monthly average is your AIME.

If you do not know your AIME, your best source is your Social Security earnings record. You can review your record and estimates through your personal Social Security account. If the earnings record has errors, your estimate can be wrong, so always verify that your wages and self-employment income were posted correctly.

1. Gather your Social Security covered earnings history.
2. Adjust older earnings using Social Security indexing rules.
3. Select the highest years used in the formula.
4. Total those indexed earnings.
5. Convert the total into a monthly average to get your AIME.

That sounds technical because it is technical. The good news is that once you know your AIME, estimating the SSDI benefit becomes much easier.

Step 4: Apply the primary insurance amount formula

After Social Security calculates your AIME, it applies bend points. Bend points are thresholds in the formula that replace different portions of your prior earnings at different rates. Lower earnings receive a higher replacement percentage. Higher earnings still count, but at lower percentages. This makes the formula progressive.

Formula Year	90% Rate Applies To	32% Rate Applies To	15% Rate Applies To
2024	First $1,174 of AIME	AIME over $1,174 through $7,078	AIME over $7,078
2025	First $1,226 of AIME	AIME over $1,226 through $7,391	AIME over $7,391

Suppose your AIME is $4,200 in 2025. You would calculate the estimated primary insurance amount like this:

1. Take 90% of the first $1,226.
2. Take 32% of the amount from $1,226 up to $4,200.
3. Because $4,200 is below the second bend point, there is no third-tier amount.
4. Add the tier results together.
5. Round down to the next lower dime for an estimate of the PIA.

That estimated PIA is the monthly SSDI benefit before certain deductions or offsets. If you receive a qualifying public disability payment or workers’ compensation, an offset may reduce what SSDI actually pays. This calculator allows you to subtract a direct monthly offset amount to produce a practical adjusted estimate.

Step 5: Account for offsets and deductions

Your gross SSDI estimate is not always your net payment. The actual payment can be changed by several factors:

• Workers’ compensation or public disability benefit offset: SSDI can be reduced in some cases.
• Medicare premiums: Once Medicare starts, premiums may be deducted from your payment depending on your situation.
• Attorney fees or overpayment recovery: Temporary deductions may occur.
• Family benefits: Auxiliary benefits for eligible dependents are separate and follow family maximum rules.
• Taxation: Some SSDI benefits can become federally taxable depending on combined income, though taxes are not directly deducted in every case.

One of the biggest points of confusion is the workers’ compensation offset. Social Security has rules that can reduce SSDI when combined benefits exceed a defined threshold tied to prior earnings. Because that exact computation depends on additional facts, many online calculators use a simplified approach. This tool asks for a monthly offset amount and subtracts it directly, which gives you a useful planning estimate without overstating your likely payment.

Step 6: Know what disability approval does and does not change

Approval for disability means Social Security accepted that your condition meets the legal standard for disability. It does not mean Social Security creates a custom payment amount based on diagnosis severity, surgery count, or pain score. Instead, the payment is still tied primarily to your insured earnings history. In other words, medical evidence decides whether you qualify, while your work record largely decides how much you receive.

This is why two people with the same impairment can receive very different checks. A worker with a higher and longer covered earnings record will usually receive a larger SSDI benefit than a worker with fewer covered wages, even if both are medically disabled.

How to estimate your benefit if you do not know your AIME

If you only know your approximate work history, use this simple process:

1. Review your Social Security statement and identify your yearly taxed earnings.
2. Make sure missing years or incorrect wages are corrected before relying on the estimate.
3. Use Social Security’s own estimate tools when available to see projected disability amounts.
4. Once you have an AIME or a close estimate, enter it into the calculator above.
5. Subtract any expected monthly offset for a more realistic net result.

Common mistakes people make when calculating SSDI

• Using gross salary today instead of indexed career earnings.
• Confusing SSDI with SSI.
• Ignoring missing wages on the Social Security earnings record.
• Assuming diagnosis alone determines the payment amount.
• Forgetting that offsets can reduce the check.
• Using retirement claiming rules instead of disability rules.

Another frequent misunderstanding is assuming Social Security will pay a full pre-disability wage replacement. SSDI does replace part of prior earnings, but not all of them. The progressive formula usually replaces a larger percentage of lower earnings than higher earnings. That is one reason why the bend point structure matters so much.

What this calculator does well

This calculator is useful because it translates a technical Social Security formula into a practical estimate. It does four things that matter for planning:

• Applies the correct bend-point structure for the selected year.
• Calculates the estimated primary insurance amount from your AIME.
• Subtracts a monthly offset if you enter one.
• Compares current work income to the appropriate SGA threshold.

That combination makes it helpful for initial case screening, budgeting, attorney intake, and household planning. It is not a substitute for a formal award notice, but it is strong enough to answer the common practical question: “About how much SSDI could I receive?”

Where to verify your numbers

For the most reliable answers, always compare your estimate with official Social Security information. The following sources are authoritative and worth reviewing:

• Social Security Administration disability benefits overview
• SSA primary insurance amount formula and bend points
• SSA disability qualification and work credit rules

Final takeaway

So, how do you calculate Social Security disability benefits? Start by confirming you are dealing with SSDI, not SSI. Make sure you have enough work credits. Find your AIME. Apply the correct bend-point formula for the applicable year. Round to the next lower dime. Then subtract any likely offset. That gives you a strong estimate of your monthly SSDI benefit.

If you want the closest possible estimate, the single most important input is your accurate Social Security earnings history. Once that record is correct, the benefit math becomes much more dependable. Use the calculator above to turn that earnings history into a monthly estimate and a clear visual breakdown of the formula tiers.