What "prior income" means for SSDI
Prior income is the money you earned in the months or years before you applied for SSDI. Social Security uses it to figure out how much your monthly benefit would be — not to decide whether you get benefits at all. The agency looks at your actual work history, not what you say you earned, because they have your tax records.
This is different from the income limits you may have read about. Those limits (like Substantial Gainful Activity, or SGA) decide whether you can work right now. Prior income decides the size of your check if you're found disabled.
The calculation is automatic once you file. You don't choose which years to count or how to present your earnings — Social Security pulls your wage record from the Internal Revenue Service and does the math themselves.
Key Takeaways
- Social Security uses your actual tax records to calculate prior income, not what you report, so the agency already knows what you earned.
- The agency averages your highest 35 years of earnings (or fewer if you haven't worked that long) to set your monthly benefit amount.
- Years with zero earnings still count in the average, which lowers your benefit if you took time out of the workforce.
- If you worked recently, those recent years usually count more heavily because they're closer to the year you became disabled.
- You can request a copy of your earnings record from Social Security to check for mistakes before you file.
How Social Security gets your earnings information
The agency doesn't ask you to prove what you earned — they already have it. Every employer who paid you sends a wage report to the IRS, and the IRS shares that data with Social Security. Your earnings record is built from those official reports, not from anything you tell them.
This means if you were paid under the table, worked as an independent contractor without filing taxes, or earned money informally, Social Security won't have a record of it. Only reported wages count. If you did file taxes on self-employment income, that counts too — Social Security gets those records from your tax returns.
The agency keeps a running record of your earnings from age 18 onward. You can see what they have on file by creating an account at ssa.gov and viewing your earnings record, or by requesting a paper copy by mail.
Which years count and why the average matters
Social Security calculates your benefit by averaging your 35 highest-earning years. If you haven't worked 35 years, they use however many years you have worked — but they still divide by 35, which lowers your average. This is why someone who worked 20 years gets a smaller benefit than someone who worked 35 years at the same wage.
The agency counts years starting from age 22 (or from when you first worked, if that's later). Years with no earnings — time you spent in school, raising children, unemployed, or out of the workforce — count as zero and pull down your average. This is called the "dropout years" rule, and it's why your benefit can be lower if you took extended time away from work.
Years don't have to be consecutive. If you worked at age 25, took five years off, then worked again at age 30, both periods count. The agency straightforward picks your 35 best years regardless of when they happened.
Recent earnings and how they affect your benefit
If you worked in the year or two before you became disabled, those recent earnings usually show up in your benefit calculation because they're part of your 35 highest years. The more recent your work, the higher your average tends to be — assuming you were earning decent wages when you stopped working.
This can work in your favor or against it. If you were earning $50,000 a year and then became disabled, that high recent wage helps your benefit. But if you had dropped to part-time work or lower-wage work in your final years before disability, your average might be lower than it would have been if you'd stopped working five years earlier at a higher wage.
Social Security doesn't adjust for inflation in the way you might expect. Instead, they use a formula called "bend points" that accounts for wage growth over time. This means your earnings from 20 years ago are adjusted upward to reflect what wages were worth then, so older years aren't automatically worth less.
What happens if your earnings record has errors
Mistakes in your earnings record are rare but do happen — a misreported name, a wrong Social Security number on a W-2, or an employer who never reported wages. If your record is wrong, your benefit will be calculated from incorrect data.
You can check your record for free on ssa.gov or request a paper copy. If you spot an error, you'll need to contact Social Security with proof: a W-2, a pay stub, or a letter from your employer. The agency can correct the record, but you may need to provide documentation from the year in question, which can be difficult if it was decades ago.
If you find an error after you've already been approved for SSDI, Social Security can recalculate your benefit. It's worth checking before you file, because correcting errors after approval takes longer and requires more back-and-forth.
How prior income connects to your benefit amount
Your prior income doesn't determine whether you get SSDI — your medical condition does. But it determines how much you receive each month. The formula is the same for everyone: average your 35 highest years, explore the bend points formula, and that's your Primary Insurance Amount (PIA).
Someone who earned $20,000 a year on average will receive a smaller monthly check than someone who earned $60,000 a year on average, even if both are found disabled. The formula replaces a percentage of your earnings, not a flat dollar amount, so higher earners get higher benefits in absolute terms.
If you have a spouse or children, they may also receive benefits based on your earnings record. Their amounts are calculated as a percentage of your PIA, so your prior income affects their checks too.
Checking your earnings record before you file
Creating a my Social Security account at ssa.gov takes about 10 minutes and lets you see your official earnings record. The record shows what Social Security has on file for each year you worked. Review it for any years that look wrong — missing wages, wages that seem too low, or years you don't remember working.
If you spot an error, write down the year, the employer name if you remember it, and what you think the correct amount should be. Gather any documents you have: W-2s, pay stubs, or tax returns. Then contact your local Social Security office or call 1-800-772-1213 to report the mistake.
Correcting errors takes time, so do this before you file for SSDI if you can. If you file first and then discover an error, you can still have it corrected, but it may delay your benefit calculation or require a recalculation after you're approved.
Frequently Asked Questions
Does Social Security count money I earned under the table?
No. Only wages reported to the IRS appear in your earnings record. If you were paid cash and didn't file taxes on it, Social Security has no record of it. Self-employment income counts only if you filed a tax return reporting it.
What if I didn't work for several years — does that hurt my benefit?
Yes, it lowers your average. Years with zero earnings count toward your 35-year average, so time out of the workforce pulls down your benefit amount. The more years you didn't work, the bigger the impact.
Can I ask Social Security to use only my best years instead of averaging 35?
No. The formula is fixed: your 35 highest years (or fewer if you haven't worked that long), averaged and run through the bend points formula. You cannot choose which years to count or ask them to exclude low-earning years.
If I keep working after I explore for SSDI, does that change my prior income calculation?
Not retroactively. Your prior income is locked in based on your earnings up to the month you file. Work you do after filing may affect whether you stay on SSDI (through the SGA limit), but it won't recalculate your benefit amount unless you earn enough to change which 35 years are your highest.
How do I know what my monthly benefit will be before I file?
Social Security provides a benefit estimate on my Social Security accounts. You can also call 1-800-772-1213 and ask for an estimate based on your earnings record. The estimate is not exact — the final amount is calculated after you file — but it gives you a close picture of what to expect.