Calculate your estimated SSDI monthly benefit using the official SSA Primary Insurance Amount (PIA) formula with 2024 bend points. Also check SSI flat rates, required work credits, back pay potential, and whether your earnings history qualifies you for Social Security Disability Insurance.
✓Verified against SSA PIA formula & 2024 bend points — SSA.gov POMS — April 2026
📋 Your Earnings & Work History
$
Find on your Social Security Statement at ssa.gov/myaccount. Typical range: $800–$8,000/moPlease enter a valid AIME amount.
credits
You earn up to 4 per year. Most people need 40 (with 20 in last 10 years)Please enter your work credits (0–160).
SSDI is based on work history. SSI is needs-based with no work requirement
months
Used to estimate back pay. SSDI has a 5-month waiting periodPlease enter months since disability onset (0–120).
Estimated Monthly SSDI Benefit
$0
Based on SSA PIA formula with 2024 bend points
Work Credits Progress0 / 40 credits
SSI vs SSDI Comparison
⚠️ Disclaimer: This is an estimate only based on the SSA PIA formula. Your actual benefit depends on your complete earnings history, the SSA benefit verification process, and any applicable offsets. For your official benefit estimate, create a my Social Security account at ssa.gov/myaccount. This is not legal or financial advice.
Official SSA page confirming the 2024 SSI federal benefit rate of $943/month for individuals and $1,415/month for eligible couples.
Formula used (verified SSA.gov POMS RS 00605.900): SSDI = (90% × min(AIME, $1,174)) + (32% × max(0, min(AIME, $7,078) − $1,174)) + (15% × max(0, AIME − $7,078)). Back pay starts after 5-month waiting period; maximum retroactivity 12 months before application. 2024 SGA: $1,550/month (non-blind), $2,590/month (blind).
How Disability Benefits Are Calculated: SSDI vs SSI
Social Security disability benefits come in two distinct programs with completely different calculation methods. SSDI (Social Security Disability Insurance) is an earned benefit based on your work history and payroll taxes paid — your monthly amount depends entirely on your lifetime earnings record. SSI (Supplemental Security Income) is a needs-based safety net program with a flat federal payment rate regardless of work history, but with strict income and asset limits.
The SSA PIA Formula: How Your SSDI Benefit Is Calculated
The Social Security Administration uses a three-bracket formula to calculate your Primary Insurance Amount (PIA), which becomes your monthly SSDI benefit. The formula deliberately replaces a higher percentage of earnings for lower earners, making it progressive by design. It uses your Average Indexed Monthly Earnings (AIME), which is derived from your highest 35 years of inflation-adjusted earnings.
🧮 Official SSA PIA Formula (2024 Bend Points)
PIA = 90% × min(AIME, $1,174)
+ 32% × max(0, min(AIME, $7,078) − $1,174)
+ 15% × max(0, AIME − $7,078)
Bend points ($1,174 and $7,078) are set annually by SSA. AIME = average of highest 35 years of indexed earnings ÷ 420. The PIA is rounded down to the nearest $0.10. Source: SSA POMS RS 00605.900
SSDI Work Credits: Do You Qualify?
To qualify for SSDI, you must have enough work credits earned through Social Security-covered employment. Credits are earned based on annual earnings — in 2024, you earn 1 credit for every $1,730 in covered earnings, up to 4 credits per year. The number of credits required depends on your age at the time you become disabled.
Age When Disabled
Credits Required
Recent Work Required
Max Annual Credits
Under 24
6 credits
3 years before disability
4
24–30
Credits for half the time since age 21
Varies
4
31–42
20 credits
10 years before disability
4
43–61
20–40 credits (age-based)
10 years before disability
4
62 or older
40 credits
20 in last 10 years
4
SSDI Back Pay and the 5-Month Waiting Period
One of the most misunderstood aspects of SSDI is the 5-month waiting period. Benefits do not begin until the 6th full calendar month after SSA establishes your disability onset date. This means even if your disability onset was January 1, your first SSDI payment covers July. Additionally, SSDI back pay can be retroactive up to 12 months before your application filing date (minus the 5-month wait), so the timing of your application matters significantly.
Key SSDI Figure
2024 Amount
Notes
Average SSDI benefit
$1,537/month
Average across all SSDI recipients
Maximum SSDI benefit
$3,822/month
High lifetime earners
SSI individual rate
$943/month
Federal base rate; some states add supplement
SSI couple rate
$1,415/month
Both must meet SSI eligibility
SGA limit (non-blind)
$1,550/month
Earning above this can end eligibility
SGA limit (blind)
$2,590/month
Higher limit for blind individuals
Work credit value
$1,730/credit
Max 4 credits per year
SSI asset limit (individual)
$2,000
Countable assets only
SSI vs SSDI: Which Program Are You Eligible For?
Many applicants are surprised to learn they may be eligible for both SSDI and SSI simultaneously. This is called "concurrent benefits." It typically happens when your SSDI benefit amount is very low (below the SSI federal rate) due to limited work history. In these cases, SSI can top up your SSDI payment to reach the SSI standard. The combined amount still cannot exceed the SSI federal rate.
💡 Important: SSA processes SSDI and SSI applications simultaneously when you apply. You do not need to apply for each separately. Mention both programs when filing your application. The SSA will determine which program(s) you qualify for based on your work history, income, and assets. About 15% of disability beneficiaries receive concurrent SSDI and SSI benefits.
Frequently Asked Questions
Your SSDI monthly benefit is calculated using the SSA PIA formula applied to your AIME. The 2024 average SSDI benefit is approximately $1,537/month. The maximum is $3,822/month for high earners. Lower lifetime earners receive less. Use this calculator to estimate your amount based on your AIME.
SSDI benefits do not begin until the 6th full calendar month after the date SSA establishes your disability. If your disability onset is January 1, your first eligible month is July. SSI has no waiting period. SSDI back pay can cover up to 12 months before your application, minus the 5-month wait.
Most applicants need 40 total work credits, with 20 earned in the last 10 years. Younger workers need fewer: under 24 needs just 6 credits, ages 24–30 need credits covering half the period since age 21. In 2024, each credit costs $1,730 in covered earnings, up to 4 per year.
The 2024 federal SSI rate is $943/month for an individual and $1,415/month for an eligible couple. Some states provide additional state supplemental payments. SSI has no work requirement but limits income and resources ($2,000 individual, $3,000 couple in countable assets).
AIME (Average Indexed Monthly Earnings) is calculated from your highest 35 years of Social Security-covered earnings, indexed for inflation, divided by 420 months. Find your estimated AIME on your annual Social Security Statement at ssa.gov/myaccount. If you worked fewer than 35 years, zeros fill the missing years, lowering your AIME.
Yes, this is called concurrent benefits. If your SSDI benefit is below the SSI standard ($943/month), SSI can supplement the difference. You must independently meet SSI eligibility requirements (income and asset limits). About 15% of disability beneficiaries receive concurrent benefits.
Initial SSDI decisions take 3–6 months. About 67% are denied initially. Reconsideration takes another 3–6 months. An ALJ hearing (if needed) typically takes 12–24 months after requesting. The total process often takes 1–3 years for denied cases that go to hearing, which is why applying as soon as possible is critical.
SGA is the earnings threshold above which SSA considers you capable of working. For 2024, SGA is $1,550/month for non-blind individuals and $2,590/month for blind individuals. Earning above SGA generally disqualifies you from SSDI eligibility. There is a Trial Work Period allowing 9 months of unlimited earnings while testing your ability to work.
Yes. When you reach full retirement age (currently 67 for those born after 1960), SSDI automatically converts to Social Security retirement benefits. The monthly amount remains the same — only the program name changes. This transition is automatic and requires no action from you.
Yes. Eligible family members can receive auxiliary benefits: your spouse age 62 or older (up to 50% of your PIA), your spouse caring for a child under 16, and your dependent children under 18 (or 19 if still in school). Total family benefits are capped at 150–180% of your PIA.
Yes. After receiving SSDI benefits for 24 months, you automatically become eligible for Medicare (Parts A and B), regardless of your age. This is one of the most valuable aspects of SSDI. SSI recipients may be eligible for Medicaid in most states from the start of benefits.
SSDI back pay covers the period from the month after your 5-month waiting period ends through the month before your approval. Retroactive benefits can go back up to 12 months before your application date (minus the 5-month wait). Back pay is typically paid as a lump sum, though SSI retroactive pay is paid in installments of up to 3 times the monthly SSI rate.