Going back to work on SSDI shouldn't feel like defusing a bomb. But the rules — 9 Trial Work Period months inside a rolling 60-month window, then a 36-month Extended Period of Eligibility where a single month over SGA can suspend your check — are genuinely hard to track by hand, because the dollar triggers change every year and your rolling window almost always spans multiple years. This guide does the math out loud, with three worked examples.
Step 0 — This is SSDI only. SSI has different rules.
Before anything else: everything below applies to Social Security Disability Insurance (SSDI). If you receive SSI (Supplemental Security Income), the work rules are completely different — there is no Trial Work Period in SSI; earnings reduce the payment on a formula instead. If you receive both, the SSDI rules here apply only to the SSDI portion. Getting this wrong is the fastest way to a surprise overpayment.
The three numbers that control everything in 2026
- 1️⃣ TWP service-month trigger: $1,210/month gross (2026). Any month you earn over that (before taxes) is a Trial Work Period "service month." It was $1,160 in 2025 and $1,110 in 2024 — and each year's trigger applies to that year's months. (Self-employed: more than 80 hours in the business also counts.)
- 2️⃣ You get 9 service months — counted inside a rolling 60-month window. The TWP is complete only when 9 service months fall within any 60-month span. Old service months roll off the window as time passes.
- 3️⃣ SGA (what matters after the TWP): $1,690/month non-blind in 2026 ($2,830 blind). During the TWP itself, SGA is irrelevant — benefits continue no matter how much you earn. SGA only starts deciding checks after your 9th TWP month.
All figures are from SSA's official cost-of-living tables (ssa.gov/oact/cola). The rulebook for how SSA field offices actually count service months is POMS DI 13010.060 — worth knowing by name, because it's the reference SSA itself uses when your count is disputed.
Worked example 1 — Maria: the same wage, two different answers
Maria takes a part-time job in September 2025 earning a steady $1,180/month gross, and keeps it through March 2026.
- 📅 Sept–Dec 2025: $1,180 is over the 2025 trigger ($1,160) → 4 service months.
- 📅 Jan–Mar 2026: the same $1,180 is under the 2026 trigger ($1,210) → 0 service months.
- 🧮 Running total: 4 of 9 TWP months used. Her wage never changed — the year did.
This is the single most common counting error: applying the current year's threshold to prior-year months. If Maria had used $1,210 across the board, she'd think she had used zero TWP months in 2025 and be four months ahead of where she actually is — the kind of miscount that surfaces years later as an overpayment letter.
Worked example 2 — James: the rolling window gives months back
James tried working in early 2021 and logged 4 service months (February–May 2021), each over that year's trigger. It didn't work out; he stopped. In June 2026 he starts again at $1,400/month — over the 2026 trigger, so every month counts.
- 🪟 The window is always the 60 months ending with the month you're counting. For June 2026, it reaches back to July 2021.
- ♻️ His Feb–May 2021 service months are all older than that — they have rolled off. Inside the current window his count is 0, not 4.
- 🧮 Working June 2026 onward at $1,400/mo, he doesn't complete his TWP until he accumulates 9 service months inside one 60-month span — February 2027 at the earliest.
Two takeaways. First, the rolling window can work for you — old attempts age off. Second, the count is not "9 in a lifetime, ever": it's 9-in-60. But once you do complete 9-in-60, the TWP is used — you don't get a fresh one while you remain on the same entitlement. That asymmetry is why an accurate month-by-month ledger matters so much before your 9th month, not after.
Worked example 3 — Aisha: the EPE, the grace period, and the IRWE save
Aisha completed her 9th TWP month in December 2025. Her Extended Period of Eligibility runs January 2026 through December 2028 — 36 consecutive calendar months, whether or not she works. In 2026 she earns $1,750/month gross, over the $1,690 SGA line.
- 🛬 Grace period: the first month SSA determines she's over SGA after the TWP (say March 2026) plus the next two months — March, April, May — are all paid in full, even over SGA.
- ⏸️ From June 2026: a month over SGA is suspended (no check that month); a month under SGA is paid, automatically, with no re-application — that's the entire point of the EPE.
- 🧾 The IRWE save: Aisha pays $120/month out of pocket for disability-related transportation she needs in order to work. Impairment-Related Work Expenses are deducted from countable earnings before the SGA test: $1,750 − $120 = $1,630 — under $1,690. Counted correctly, she was never over SGA at all, and every check continues.
The IRWE line is the most under-used protection in the whole system. Out-of-pocket costs caused by your disability that you need in order to work — certain co-pays, medical devices, attendant care, specialized transportation — reduce your countable earnings. People suspend their own benefits by reporting gross wages without ever claiming the deduction they were entitled to.
Report monthly, and keep the ledger SSA will eventually ask for
Two habits prevent nearly every TWP horror story. One: report wages monthly through your my Social Security account (or your local office) so an overpayment can never silently accumulate. Two: keep a month-by-month ledger — gross wages, the year-specific trigger, service-month yes/no, running 9-in-60 count, and IRWE receipts. When SSA reviews your work activity, they send form SSA-821-BK (Work Activity Report), which asks for exactly this, month by month, going back years. With a ledger it's a 20-minute form. Without one it's a panic — and the estimates you put down become the record you're arguing against later.
Free resources worth knowing: SSA's Red Book (the official work-incentives guide, free PDF), the yearly amounts at ssa.gov/oact/cola, and a WIPA counselor (free benefits counseling via Ticket to Work) who can walk your specific case. What none of them hand you is the tracking artifact itself — a live spreadsheet that applies each year's threshold to each year's months and keeps the rolling 9-in-60 count for you. That's the gap our SSDI Trial Work Period Tracker Kit fills — free to pre-order today.
If you're earlier in the process and heading to an ALJ hearing, see our guide to the SSDI 5-day evidence rule (inform vs. submit) — a different clock entirely, and one that wins or loses hearings.
This article is general educational information about Social Security work rules, not legal or benefits advice. Thresholds shown are the official SSA amounts for the years stated; always verify current-year figures at ssa.gov and confirm your specific situation with SSA or a WIPA counselor.