Substantial Gainful Activity (SGA), explained

If you're applying for SSDI and earning anything, you need to know exactly where you are relative to SGA. In 2026 the line is $1,690/month for non-blind workers. SSA looks at gross monthly earnings, not your annualized average.

If you earned $2,000 in March, that month presumes you can do substantial work — even if April was zero. Plan with the monthly threshold in mind, not an annual one. Document any condition-related accommodations or subsidies that reduce your true 'countable' earnings.

Once you're on SSDI, the Trial Work Period (TWP) lets you test work for 9 months (not necessarily consecutive) without losing your benefits, no matter how much you earn. The TWP threshold for triggering a 'TWP month' in 2026 is $1,160/month — earnings at or above that count toward your 9.

After the 9 months are used (within a rolling 60-month window), you enter the Extended Period of Eligibility (36 months). During the EPE, your check pays only in months you're under SGA. After the EPE, the first month over SGA can end your benefits.

For self-employment, SSA can't just check a paycheck — they evaluate three tests under POMS DI 10510: (1) Significant Services and Substantial Income test, (2) Comparability of Work test, and (3) Worth of Work test. Generally, working more than 45 hours a month in your business or earning over SGA after expenses is treated as SGA.

Keep clean books. Document your hours, your tasks, and what you used to do versus what you do now. Self-employment SGA cases are evidence-heavy.

Impairment-Related Work Expenses (IRWE) you pay out of pocket reduce your countable earnings for SGA. Examples: medications you wouldn't take if you weren't working, attendant care, specialized transportation, work-required equipment or modifications.

If you earn $2,000/month but spend $500/month on IRWE, your countable SGA is $1,500 — below the 2026 SGA limit. Document IRWE receipts and the medical reason for each expense.

If your employer pays you $1,800/month but the actual market value of the work you produce is only $1,200 (because they accommodate you, give you extra breaks, assign you lighter tasks, or essentially carry you), the difference — $600 — is a 'subsidy' that reduces your countable SGA earnings.

This pattern is common with family-owned businesses or workplaces with informal accommodations. SSA needs documentation: a written employer statement explaining the accommodation and the value differential.

Statutory blindness gets a higher SGA threshold — $2,830/month in 2026 vs. $1,690 for non-blind workers. This recognizes that the work landscape for people with severe vision impairment makes earnings comparisons different.

Statutory blindness is defined at central visual acuity 20/200 or worse with best correction in the better eye, or visual field 20 degrees or less. Document your vision exam if you're applying as blind — the documentation requirement is specific.

Yes — the SGA test applies for the initial SSI disability decision (same as SSDI). But once you're on SSI, SSA doesn't apply SGA to ongoing benefits the same way. SSI cash is reduced based on countable income (with the $20 + $65 + 50% disregards), and SGA only matters again if SSA does a Continuing Disability Review.

The net effect: SSI is more forgiving of part-time work over time than SSDI is. The $1 reduction for every $2 earned (after disregards) is a smoother sliding scale than SSDI's cliff-edge SGA cutoff.

The single most important habit for someone working while on SSDI: report earnings to SSA in real time, every month. Use SSA's mobile app, the my Social Security online tool, or call.

Keep a binder: pay stubs, IRWE receipts, employer subsidy letters, dates of any work attempts. The most expensive SSDI overpayments come from years of unreported work earnings discovered all at once. Real-time reporting protects against that.