Your SSDI payment shrinks or stops when you earn above a threshold, but the reduction follows a specific formula, not a dollar-for-dollar cut

Social Security Disability Insurance (SSDI) uses a substantial gainful activity (SGA) test to decide whether your work income reduces your benefit. If you earn more than the SGA limit in a month—currently $1,550 per month for non-blind beneficiaries and $2,590 for blind beneficiaries in 2024—Social Security counts that month as a month of work. Once you have nine months of SGA earnings in a rolling 60-month period, your benefits stop. The key word is "rolling": months drop off the back as new months are added to the front.

The SGA limit changes each year. Social Security publishes the new figure in December for the following year. You can find the current limit on the Social Security website or by calling 1-800-772-1213. The threshold is the same whether you work part-time or full-time, and it applies to net self-employment income (after business expenses) as well as wages.

Before you hit nine months of SGA, your payment does not automatically drop. Instead, Social Security applies the earnings test: for every $2 you earn above a monthly threshold (different from SGA), your benefit reduces by $1. That monthly threshold is $822 in 2024 for non-blind beneficiaries. Once you cross into SGA territory, the earnings test no longer applies—instead, you are counting toward your nine-month limit.

Key Takeaways

  • Earning more than $1,550 per month (2024 figure for non-blind beneficiaries) counts as a month of substantial gainful activity, and nine such months in a rolling 60-month period will end your benefits.
  • Below the SGA threshold, the earnings test reduces your benefit by $1 for every $2 you earn above $822 per month, so small work income does not eliminate your check.
  • The SGA limit and earnings test threshold both change annually, so you must check the current year's figures before calculating your own situation.
  • Months with SGA earnings drop off your record after 60 months, so a return to lower earnings can eventually restore your benefits without a new process.

How the earnings test works before you hit nine months of SGA

Suppose your SSDI payment is $1,200 per month and you earn $1,000 in wages in January 2024. Your earnings are below the SGA threshold of $1,550, so you do not count January as a month of SGA. Instead, Social Security applies the earnings test. You earned $1,000, which is $178 above the monthly threshold of $822. For that $178, Social Security deducts $89 from your benefit (half of $178). Your January payment becomes $1,111 instead of $1,200.

The earnings test applies month by month. If you earn $500 in February, you are $322 below the threshold, so no deduction occurs and you receive your full $1,200. If you earn $2,000 in March, you cross the SGA line: March counts as a month of SGA, the earnings test does not explore, and you receive $0 for that month. You now have one month of SGA on your record.

This matters because many people work part-time or seasonally. A retail worker who earns $900 in slow months and $1,600 in busy months will have some months with earnings test reductions and some months counted as SGA. The rolling 60-month window means that months from five years ago eventually stop counting, so if you had three months of SGA in 2019, they no longer affect you in 2024.

What happens when you reach nine months of SGA

Once Social Security records your ninth month of SGA earnings, your benefits stop. You do not receive a notice that says "this is your ninth month"—instead, you straightforward stop getting a payment. Social Security sends a notice explaining the termination, usually after the fact. The notice will say your benefits ended because of work activity.

Your benefits do not restart automatically. You must contact Social Security and report that your earnings have dropped below SGA. Social Security will then review your recent earnings history. If you have fallen below SGA for a full month, your benefits can resume the following month. If you are still earning above SGA, your benefits remain stopped.

The nine-month rule creates a planning problem for people who work inconsistently. If you know you will have a busy season with high earnings, you might reach nine SGA months faster than you expect. Some people track their own months to avoid surprise termination. You can ask Social Security to review your earnings record at any time, and they will tell you how many SGA months you have accumulated.

Work incentives that protect your earnings and benefits

Social Security offers work incentives designed to let you test your ability to work without losing benefits when ready. The most important one for SSDI is the Trial Work Period (TWP). During your TWP, you can earn any amount—even $10,000 per month—and Social Security will not count those months toward your nine-month SGA limit. Your benefits continue in full regardless of how much you earn.

The TWP lasts nine months, but they do not have to be consecutive. You can use one month in 2024, skip six months, and use another in 2025. Social Security counts only months in which you earn $1,050 or more (2024 figure) as TWP months. Once you have used all nine TWP months, the earnings test and SGA rules explore as normal.

After your TWP ends, you enter the Extended may be able to access Period (EPE), which lasts 36 months. During the EPE, the earnings test still applies (you lose $1 for every $2 above the threshold), but you do not count toward your nine-month SGA limit. This gives you a longer runway to see whether work is sustainable before your benefits stop permanently.

A third incentive, the Plan to Achieve Self-Support (PASS), lets you set aside income and resources for a specific work goal without those amounts counting against your SSDI or Supplemental Security Income (SSI). A PASS is complex and requires a written plan approved by Social Security, but it can protect a large portion of your earnings if you are saving for education, equipment, or business startup costs.

Self-employment income and the SGA test

If you are self-employed, Social Security counts your net self-employment income (revenue minus business expenses) toward the SGA threshold. The calculation is the same: if your net income exceeds $1,550 per month, that month counts as SGA. However, self-employment creates a second test called the substantial services test. If you work more than 45 hours per month in your business, Social Security presumes you are performing SGA, even if your net income is below $1,550. If you work 45 hours or fewer, Social Security uses your net income to decide.

This rule protects people who own low-profit businesses. A person who works 40 hours per month in a business that nets $800 will not be counted as performing SGA because they are below the 45-hour threshold and their income is below $1,550. But a person who works 50 hours per month in the same business will be counted as performing SGA because they exceeded the hours threshold.

Self-employed beneficiaries should track both hours and net income carefully. Social Security may ask for business records, tax returns, or a log of hours worked. Keeping accurate records protects you if Social Security questions whether you met the SGA test in a particular month.

How to report work income to Social Security

You are required to report work income to Social Security within 30 days of the month in which you earned it. If you earned wages in January, you should report by the end of February. Failure to report can result in an overpayment—Social Security will have paid you benefits you were not may have access to to, and you will owe the money back.

You can report by phone (1-800-772-1213), in person at your local Social Security office, or online through your my Social Security account. When you report, have your pay stubs or business records ready. Social Security will ask how much you earned, whether it was wages or self-employment income, and the dates of work. They will then calculate whether the earnings test applies or whether the month counts as SGA.

Many people worry that reporting work income will trigger an when ready benefit cut. In reality, Social Security needs the information to calculate correctly. Failing to report is worse: it creates an overpayment that you must repay, sometimes with interest. Reporting promptly and accurately protects you.

Frequently Asked Questions

If I earn $1,600 one month and $800 the next, do both months count as SGA?

No. The $1,600 month counts as SGA because it exceeds $1,550. The $800 month does not count as SGA because it is below the threshold. Instead, the earnings test applies to the $800 month: you earn $0 above the $822 threshold, so no deduction occurs and you receive your full benefit.

Can I get my benefits back if I stop working?

Yes, but only after you have a full month below the SGA threshold. If you earned above SGA in March and stop working in April, your April earnings will be $0, which is below SGA. Social Security will reinstate your benefits starting in May. However, if you have already accumulated nine SGA months, your benefits have already stopped, and you must contact Social Security to request reinstatement.

Do I have to use my Trial Work Period all at once?

No. Your nine TWP months can be spread across multiple years. You might use three months in 2024, take a break, and use four more in 2025. Only months in which you earn $1,050 or more count toward your nine-month total. Once all nine are used, the earnings test and SGA rules explore.

What counts as income for the SGA test—wages only, or tips and bonuses too?

All earned income counts: wages, tips, bonuses, commissions, and net self-employment income. Unearned income like interest, dividends, rental income, or gifts does not count toward SGA. Social Security looks only at income you earned through work activity.

If I work part-time and earn below SGA every month, will my benefits ever stop?

No. If you never have a month of SGA earnings, you never accumulate toward the nine-month limit, and your benefits will not stop due to work. You may have earnings test reductions in months when you earn above $822, but your benefits will continue. This is why part-time work can be sustainable for many SSDI beneficiaries.