How Is Substantial Gainful Activity Calculated for SSDI?

To decide whether your work counts as substantial gainful activity for SSDI, Social Security starts with your gross monthly earnings, subtracts subsidized pay, impairment-related work expenses, and certain other allowable amounts, and compares the remaining “countable earnings” to a fixed monthly limit. In 2026, that limit is $1,690 per month for most claimants and $2,830 per month for people who are statutorily blind.¹ If your countable earnings sit above the threshold, SSA treats you as performing SGA; if they sit below it, your work does not disqualify you on earnings grounds.

The calculation matters because SGA is the first question in SSA’s five-step disability evaluation. If your countable earnings clear the threshold at Step 1, the review stops and you are found not disabled without any look at your medical records, age, education, or past work.² Everything that follows in this article is about how SSA gets to that countable number.

What Earnings SSA Counts

Only earned income figures into SGA: wages, salaries, commissions, and other pay tied to work you actually performed. Investment dividends, interest, and rental income from property you do not actively manage are not counted.

Earnings are assigned to the month you did the work, not the month the check arrived. Work performed in March and paid in April counts toward March. Bonuses are handled the same way, based on when the productive activity happened.³

Sick pay and vacation pay for days you did not actually work are excluded. If you worked one week in a month and drew sick pay for the other three, only the one week of active pay counts toward that month’s earnings.⁴

Impairment-Related Work Expenses

Once SSA has your gross earnings, it deducts the cost of items and services you need because of your disability in order to work. These are Impairment-Related Work Expenses, or IRWEs. To qualify, the cost must be tied directly to your medical condition, paid out of your own pocket with no reimbursement, and incurred in a month you actually worked.⁵

Common deductible expenses include:

Specialized transportation costs and vehicle modifications required because your disability prevents you from using standard transit. Ordinary bus fare or gas generally does not qualify.
Medical devices and supplies such as prosthetics, wheelchairs, medications, bandages, and syringes.
Attendant care payments to someone who helps you get ready for work, assists you on the job, or drives you to and from work.
The cost of purchasing, training, feeding, licensing, and providing veterinary care for a service animal.

An item can still be deducted if you use it outside of work too. A wheelchair used both at home and on the job still counts as an IRWE.⁵

Documenting Your IRWEs

SSA will not subtract an expense without proof. You need to show you paid for it yourself, that no insurance or other source reimbursed you, and that it relates to a specific impairment. Canceled checks or paid receipts together with a signed statement confirming no reimbursement are acceptable.⁶

When a family member provides the attendant care or transportation, the requirements are stricter. You need a statement describing the family member’s duties and schedule, evidence of cash payment, and information showing that the family member takes an economic loss to provide the service, such as cutting hours at another job.⁶

Subsidies and Special Conditions

Some employers pay workers with disabilities the standard wage even though the worker’s output is lower than that of co-workers doing the same job. The portion of pay that exceeds the actual value of the labor is a “subsidy,” and SSA subtracts it before comparing your earnings to the threshold.⁷

To measure a subsidy, SSA contacts you, your employer, your supervisor, and co-workers to compare your speed, quality, and need for extra help against what an unimpaired worker would produce in the same role. If you produce about 60 percent of what your peers do, roughly 40 percent of your pay is treated as subsidy and removed from countable earnings.⁷

“Special conditions” are handled the same way. These include on-the-job coaching where the coach performs part of your duties, rest breaks well beyond what other employees receive, and sheltered workshop settings. A sheltered workshop’s reliance on charity or its operating at a loss does not by itself make your pay subsidized; SSA still looks at whether you produce what you are being paid.⁸

Self-Employment: Three Tests and Countable Income

For self-employed claimants, gross business revenue rarely reflects how much work you personally performed, so SSA does not just look at a paycheck. It applies three tests in order and stops at the first one that produces an answer.⁹

Test 1, significant services and substantial income. You are performing SGA if you provide services significant to the operation of the business and receive substantial income from it. If you run the business alone, any services you provide are automatically significant. When others are involved, your services are significant if you contribute more than half of total management time or more than 45 hours of management per month.
Test 2, comparability. If Test 1 does not resolve the question, SSA compares your hours, skills, duties, and responsibilities to those of unimpaired people running similar businesses in your area. Comparable activity can be SGA regardless of profit.
Test 3, value of work. If your activity is not comparable, SSA asks whether your labor is clearly worth at least the monthly SGA amount, measured by its value to the business or what an owner would pay someone else to do the same work.

SSA starts with gross business income and subtracts normal business expenses to arrive at net income. From there it makes further deductions:

The reasonable value of unpaid help from a spouse, children, or others who contribute significant labor.
The same IRWE deductions available to employees.
Unincurred business expenses, meaning the value of costs someone else covers for you, such as a vocational rehabilitation agency providing a computer or a friend handling your bookkeeping for free.

What remains is your countable income, and that number is compared to the SGA threshold.⁹

Averaging Earnings Over Time

Monthly earnings swing because of seasonal work, variable hours, or health-related absences. Rather than disqualifying you based on a single strong month, SSA can average your countable earnings across a continuous stretch of work.¹⁰ Averaging applies when your earnings move above and below the threshold from month to month, your work pattern and conditions have stayed consistent, and the SGA threshold has not changed during the period.

SSA will not average across:

A change in the SGA threshold. Months before and after an annual increase are averaged separately.
A significant change in your work, such as moving from part-time to full-time, taking on substantially different duties, or a large jump in pay.

If you started at entry-level pay and later received a promotion with higher wages and different responsibilities, SSA would average the entry-level months separately from the post-promotion months.¹⁰

Unsuccessful Work Attempts

If you tried to work but had to stop or cut back within six months because of your disability, SSA may treat the job as an unsuccessful work attempt rather than proof that you can perform SGA. A UWA is not counted against you at Step 1.¹¹

Two conditions have to be met. First, the work at SGA-level earnings lasted no more than six months. Work that stays above the threshold longer than six months cannot be a UWA no matter why it ended. Second, you stopped working or dropped below SGA because of your impairment, or because special workplace accommodations essential to your performance were removed, such as losing a job coach or leaving a sheltered workshop.¹¹

Volunteer Work and Illegal Activity

Volunteer service in specific federal programs, including Volunteers in Service to America (VISTA), the Foster Grandparent Program, and the Retired Senior Volunteer Program, is excluded from the SGA calculation. Stipends, housing allowances, and expense reimbursements from those programs are not treated as earnings, and the volunteer work itself is disregarded when evaluating your work capacity.⁸ Volunteer work outside of those programs does not get this protection and can be evaluated like any other activity.

Income from illegal work can also count toward SGA. SSA draws no distinction between lawful and unlawful activity when deciding whether you are capable of productive work; if the activity involves significant physical or mental effort for profit, it can be SGA. The costs of illegal substances cannot be deducted as IRWEs, since only expenses for medically prescribed items that treat or slow an impairment qualify.¹²

1
Social Security Administration. Substantial Gainful Activity
2
Social Security Administration. 20 CFR 404.1520 – Evaluation of Disability in General
3
eCFR. 20 CFR 404.1574 – Evaluation Guides if You Are an Employee
4
Social Security Administration. POMS DI 10505.010 – Determining Countable Earnings
5
Social Security Administration. SSI Spotlight on Impairment-Related Work Expenses
6
Social Security Administration. POMS DI 10520.025 – Verifying and Documenting Issues of IRWE
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Social Security Administration. Subsidy and Special Conditions
8
Social Security Administration. 20 CFR 404.1574 – Evaluation Guides if You Are an Employee
9
eCFR. 20 CFR 404.1575 – Evaluation Guides if You Are Self-Employed
10
Social Security Administration. 20 CFR 404.1574a – When and How We Will Average Your Earnings
11
Social Security Administration. POMS DI 24005.001 – Unsuccessful Work Attempts for Initial Claims and Reconsiderations
12
Social Security Administration. SSR 94-1 – Illegal Activity as Substantial Gainful Activity