Not all SSDI counts toward your AGI, and that matters for your tax bill
Your Adjusted Gross Income (AGI) is the number the IRS uses to calculate your tax liability and to determine whether you may have access to for other tax credits and deductions. SSDI is treated differently than most income: some of it may be included in your AGI, and some may not, depending on your total income and filing status. The key is understanding the "combined income" formula the IRS uses, because that determines how much of your SSDI actually counts.
If your combined income is below a certain threshold, none of your SSDI is included in your AGI. If it exceeds that threshold, up to 85 percent of your SSDI may be added to your AGI. This is not the same as saying 85 percent of your SSDI is taxable—the amount included in AGI depends on how much other income you have.
Key Takeaways
- Combined income is calculated as your adjusted gross income plus nontaxable interest plus half of your SSDI, and this number determines whether any SSDI enters your AGI.
- If your combined income is below $25,000 (single) or $32,000 (married filing jointly), no SSDI is included in your AGI.
- If your combined income exceeds these thresholds, up to 85 percent of your SSDI may be included in your AGI, which increases your tax liability.
- Including SSDI in your AGI can affect your may be able to access for other tax benefits like the Earned Income Tax Credit or education credits.
How the IRS calculates combined income
The IRS defines combined income as your adjusted gross income (before adding any SSDI) plus any nontaxable interest income plus one-half of your SSDI benefits. This is the starting point for determining how much SSDI, if any, gets included in your AGI.
For example, if you have $15,000 in other income, $2,000 in nontaxable interest, and $20,000 in SSDI, your combined income would be $15,000 + $2,000 + (½ × $20,000) = $27,000. This combined income figure is what triggers the thresholds, not your SSDI amount alone.
The reason the IRS uses half your SSDI in this calculation is historical: it was designed to approximate the portion of SSDI that represents a return of taxes you paid into the system during your working years. The other half is considered new income. This formula has not changed since 1984.
The income thresholds that determine SSDI inclusion
The IRS has set two thresholds, and your filing status determines which one applies to you:
| Filing Status | First Threshold | Second Threshold |
|---|---|---|
| Single, Head of Household, may have access to Widow(er) | $25,000 | $34,000 |
| Married Filing Jointly | $32,000 | $44,000 |
| Married Filing Separately | $0 | $0 |
If you file Married Filing Separately, these thresholds do not explore in the traditional way—the rules are more restrictive, and you should consult a tax professional or IRS Publication 915 before filing.
These thresholds have not been adjusted for inflation since they were set in 1984. That means more beneficiaries exceed them each year, even if their actual income has not increased in real terms.
How much SSDI gets included in your AGI
Once you know your combined income and which threshold applies, the amount of SSDI included in your AGI follows a two-step rule:
If your combined income is at or below the first threshold: None of your SSDI is included in your AGI. Your SSDI remains nontaxable income for federal tax purposes.
If your combined income exceeds the first threshold but is below the second threshold: Up to 50 percent of the amount over the first threshold is included in your AGI, or up to 50 percent of your SSDI, whichever is less.
If your combined income exceeds the second threshold: Up to 85 percent of the amount over the second threshold is included in your AGI, plus the lesser of (1) 50 percent of your SSDI or (2) the amount calculated in the previous step. The maximum is 85 percent of your total SSDI.
This tiered approach means that as your other income rises, more of your SSDI is pulled into your AGI, but it never exceeds 85 percent of your total SSDI benefits.
Why AGI inclusion matters beyond your tax bill
Including SSDI in your AGI does not just affect how much federal income tax you owe. It also affects your may be able to access for other tax benefits and credits that use AGI as a threshold.
If SSDI is included in your AGI, it may reduce or eliminate your ability to claim the Earned Income Tax Credit, the American Opportunity Tax Credit, the Lifetime Learning Credit, or the Saver's Credit. It can also affect whether you may have access to for the standard deduction or whether you must file a return at all. Some states also use AGI to determine state income tax liability, so the effect can extend beyond federal taxes.
For this reason, some beneficiaries find it worthwhile to file a return even if they would not otherwise owe tax, because doing so allows them to claim refundable credits that exceed their tax liability.
Working with a tax professional on SSDI and AGI
The SSDI inclusion formula is one of the most complex parts of tax law for beneficiaries. The IRS provides Publication 915, which walks through the calculation step by step, but many beneficiaries find it easier to work with a tax preparer or CPA who has experience with SSDI taxation.
If you receive SSDI and have other income—whether from work, pensions, interest, or investments—you should have your tax situation reviewed before filing. A professional can tell you whether any of your SSDI will be included in your AGI, what your actual tax liability is, and whether you should file even if you do not owe tax.
The Social Security Administration does not calculate your tax liability or tell you how much SSDI to include on your return. That is your responsibility or your tax preparer's. Social Security does send you a Form SSA-1099 showing your total SSDI for the year, which you use to complete your tax return.
Frequently Asked Questions
If I have no other income, is any of my SSDI included in my AGI?
No. If SSDI is your only income, your combined income is half your SSDI, which is below the first threshold ($25,000 for single filers). None of your SSDI is included in your AGI, and you likely do not have to file a federal income tax return.
Does my SSDI count as earned income for the Earned Income Tax Credit?
No. SSDI is never counted as earned income. However, if you have other earned income (from work), the amount of SSDI included in your AGI can reduce the credit you receive or make you ineligible for it.
Can I reduce the amount of SSDI included in my AGI?
Not directly. The amount included is determined by the IRS formula based on your combined income. However, if you have control over when you receive other income—for example, by deferring a bonus or delaying a pension distribution—you might be able to lower your combined income in a given year and reduce SSDI inclusion. A tax professional can advise whether this strategy makes sense for your situation.
What if I disagree with how much SSDI the IRS says is included in my AGI?
You can recalculate using IRS Publication 915 or ask a tax professional to review your return. If you find an error, you can file an amended return (Form 1040-X) within three years of the original filing date. Keep records of your SSDI statements and other income documentation in case the IRS asks questions.