Estimate your appeal odds and back pay if your disability claim is approved
About 62% of initial SSDI claims are denied (roughly 38% allowed, 2024 SSA data), but the odds flip on appeal: reconsideration allows only ~13%, while about 51% of ALJ hearing decisions come back favorable. The delay is the silver lining: back pay accrues the whole time. Three rules compute it: a 5-month waiting period after onset, a 12-month lookback before your application, and your monthly benefit times the months in between. On this calculator's default case ($1,630 a month, March 2024 onset, June 2024 application, February 2026 ALJ approval), that's 17 months of back pay, $27,710, minus an attorney fee of $6,928 (25%, under the $9,200 cap), leaving $20,783.
| Stage | Approx. Allowance Rate | Typical Time to Decision |
|---|---|---|
| Initial application | ~38% (so ~62% denied) | 6 – 8 months |
| Reconsideration | ~13% (hardest stage) | ~6 months more |
| ALJ hearing | ~51% favorable (2024) | 8 – 14 months more |
| Appeals Council / federal court | Low; most are denied or remanded | 1 – 2+ years more |
Sources: SSA Annual Statistical Report and Office of Hearings Operations data for 2024. Rates drift year to year and vary by state and hearing office. The takeaway holds across years: persistence pays, and the hearing level is where denials turn into approvals.
| Rule | What It Does | Number |
|---|---|---|
| 5-month waiting period | Benefits start with the 6th full month after onset | 5 skipped months (SSDI only; SSI has none) |
| Retroactive limit | No back pay more than 12 months before the application month | 12 months |
| Back pay formula | Monthly benefit × payable months, paid as a lump sum | your PIA × months |
| Fee agreement cap | Representative gets the lesser of 25% of past-due benefits or the cap | $9,200 (favorable decisions on/after Nov 30, 2024; was $7,200) |
| Appeal deadline | Window to appeal each denial | 60 days + 5 mailing days |
| 2026 average benefit | Reference point for the monthly input | ~$1,630/month (max $4,152) |
A denial isn't the end of the road; it's the first exit on a long one. This tool does two jobs: it shows what the national data says about your odds at the next appeal stage, and it computes what back pay looks like if you win, using the three rules that govern SSDI past-due benefits.
Social Security makes every SSDI claimant skip five full months of benefits after the established onset date, so payments begin with the sixth month. If your disability began March 15, 2024, the waiting period runs April through August and entitlement starts September 2024. The wait is brutal for cash flow and generous for a different reason: it delays entitlement, which sometimes means fewer retroactive months lost to the 12-month cap.
SSDI can pay retroactive benefits for up to 12 months before your application month, no matter how long you were disabled before filing. That's the trap for people who wait two years to apply: months 13 through 24 of disability pay nothing. Applying sooner costs you nothing and preserves the window, even if the first decision takes eight months to arrive.
Back pay is your full monthly benefit times the number of months between the first payable month and the month before your favorable decision. A representative working under the standard fee agreement is paid directly by SSA, at the lesser of 25% of past-due benefits or the $9,200 cap that applies to favorable decisions issued on or after November 30, 2024.
Take the default case: $1,630 a month, onset March 15, 2024, application June 10, 2024, favorable ALJ decision February 20, 2026. Entitlement begins September 2024 (the 6th month after onset). The 12-month lookback would allow payments from June 2023, but September 2024 is later, so the waiting period governs the start. Benefits run from September 2024 through January 2026, the month before the decision: 17 months. Back pay is 17 × $1,630 = $27,710. The representative's fee is the lesser of 25% ($6,928) or $9,200, so $6,928, and the net to you is $20,783, with $1,630 a month continuing.
Remember what the model leaves out: day-level entitlement rules, proration, family benefits, workers comp and pension offsets, and SSI coordination. Treat the output as a planning number, not an award. SSA's own estimate, or a representative's, is the real one.
About 38% of initial SSDI claims are allowed, so roughly 62% are denied, per SSA data for 2024. Reconsideration, the first appeal, is the hardest stage, with allowance rates around 13%. The ALJ hearing level is where odds flip: about 51% of hearing decisions were allowances in 2024, and SSA's Office of Hearings Operations has reported national favorable rates in the upper 50s at times. Claimants who keep appealing through the hearing level win at several times the reconsideration rate, which is why most representatives tell clients to push on.
Three rules do the work. First, a 5-month waiting period: benefits begin with the 6th full month after your established onset date. Second, retroactivity is capped at 12 months before your application month, even if you were disabled earlier. Third, back pay equals your monthly benefit times the number of months between the first payable month and the month before your favorable decision. Example: $1,630 a month with a March 2024 onset, June 2024 application, and February 2026 approval pays 17 months of back pay, $27,710.
Under the standard fee agreement process, the lesser of 25% of past-due benefits or the SSA cap: $9,200 for favorable decisions issued on or after November 30, 2024 (it was $7,200 before). The fee comes out of the back pay, and SSA pays the representative directly. On a $27,710 back-pay award, 25% is $6,928, which is under the cap, so $6,928 is the fee and $20,783 goes to you. Fee-petition cases, the less common route, are also capped per SSA rules.
Budget 6 to 8 months for the initial decision, another 6 months or so for reconsideration, and 8 to 14 months more to get before an ALJ, per SSA processing data for 2024-2025; the national average wait to a hearing has run under a year recently. That's why the average approved case accrues a year or two of back pay. You have 60 days from a denial notice (plus 5 mailing days) to appeal each step, and missing that window can force you to start a new application and lose retroactive months.
Yes, in two ways. SSDI carries the 5-month waiting period and can reach back up to 12 months before the application, paid as a lump sum. SSI has no waiting period but generally pays only from the application month forward, and SSI back pay is released in installments spread over months once it's large enough. If you qualify for both, SSA coordinates the two programs, and the SSDI waiting period is where the calculations diverge.
Only under the substantial gainful activity (SGA) limit: in 2025, $1,620 a month for non-blind applicants and $2,700 for statutorily blind, figures that adjust yearly. Earning over SGA regularly is itself grounds for denial regardless of your condition. Under-the-limit or short-lived attempts usually don't sink a claim, and the trial work period rules apply after you're approved. Be honest with SSA about any work, because unreported earnings surface in the earnings record and damage credibility more than the work itself.