SSA-1099 Non-Taxable Payments: Medicare, Thresholds, 1040 Lines

On your SSA-1099, the amounts that aren’t taxed fall into two groups. First, the form itself subtracts certain items from the Box 3 gross total before producing the Box 5 net benefits figure you actually report: lump-sum death payments, refunds of excess Medicare premiums, workers’ compensation offset amounts, benefits attributable to months before December 1983, and attorney fees paid directly from your benefits. Second, benefits you repaid to Social Security during the year appear in Box 4 and reduce Box 5 dollar for dollar. Beyond those built-in subtractions, federal income thresholds then decide how much of your remaining net benefits is taxable at all, which can be anywhere from zero to 85 percent.¹

What the Form Marks as Non-Taxable

Look below the main boxes of your SSA-1099 at the section labeled “Description of Amount in Box 3.” That breakdown is where the non-taxable items are itemized and subtracted. The following payments appear there as non-taxable:

Lump-sum death payments. The one-time $255 payment to a surviving spouse or eligible child is subtracted as non-taxable when it appears on the form.
Refunds of excess Medicare premiums. If SSA withheld more for Medicare than it should have, the refunded amount is classified as non-taxable.
Workers’ compensation offset amounts. When your Social Security was reduced because you also received workers’ compensation, the offset amount is included in Box 3 but shown as a non-taxable item, because the workers’ compensation payer does not report those dollars as taxable income.²
Benefits for months before December 1983. Rare at this point, but any retroactive payments attributed to months before the taxability rules took effect are non-taxable.
Attorney fees. Representative fees paid directly out of your benefits are subtracted as non-taxable.³

Box 4 works on a separate track. Any benefits you paid back during the year, usually to clear an overpayment, are subtracted from Box 3 to produce Box 5. Those repaid dollars are excluded from the figure the IRS uses to calculate your tax.⁴

Medicare Premiums Are Not on That List

This one surprises people. The Medicare Part B, Part C, or Part D premiums deducted from your monthly check before it hit your bank account are not treated as a non-taxable subtraction. They appear in the Box 3 breakdown as a descriptive line, but they stay inside the Box 5 net benefits figure that flows into the taxability calculation.³ SSA’s position is that the premium money was yours, and SSA simply forwarded it to Medicare on your behalf.

That is why Box 3 is almost always larger than the sum of what you actually received. In 2026 the standard Part B premium alone is $202.90 per month, so a $1,500 monthly deposit can sit under a Box 3 figure that works out to more than $1,700.⁵ You may be able to deduct those Medicare premiums as a medical expense on Schedule A if you itemize, but they are not stripped out of your taxable Social Security.

How Much of What’s Left Is Actually Taxed

Even after the non-taxable subtractions, the Box 5 figure is not necessarily taxed. The IRS applies thresholds based on what it calls combined income (sometimes called provisional income): your adjusted gross income, plus any tax-exempt interest, plus half of your Box 5 net benefits.⁶ These thresholds are set by statute and are not adjusted for inflation.¹

Single, Head of Household, or Qualifying Surviving Spouse

Combined income below $25,000: none of your benefits are taxable.
Between $25,000 and $34,000: up to 50 percent may be taxable.
Above $34,000: up to 85 percent may be taxable.

Married Filing Jointly

Combined income below $32,000: none of your benefits are taxable.
Between $32,000 and $44,000: up to 50 percent may be taxable.
Above $44,000: up to 85 percent may be taxable.⁶

Married Filing Separately

If you are married filing separately and lived with your spouse at any point in the year, your base amount is zero. Up to 85 percent of your benefits is immediately subject to tax regardless of income. If you lived apart from your spouse for the full year, the $25,000 base amount applies instead.¹

“Up to 85 percent” is a ceiling, not a flat rate. The actual taxable share comes out of the worksheet in IRS Publication 915, and for most people above the top threshold it lands somewhere between 50 and 85 percent.⁷ The share of your benefits below that calculated taxable portion is money you keep tax-free.

Lump-Sum Back Payments Have Their Own Rule

If you received a lump-sum payment in the current year covering benefits owed for a prior year, common when a disability claim is finally approved, the full amount normally shows up on this year’s SSA-1099. That can push your combined income above the thresholds and make a larger share taxable than if the money had arrived on time.

The IRS lets you recalculate using a lump-sum election. You attribute the back-pay portion to the earlier year it was owed for and use that year’s income to figure the taxable amount, then compare against the regular calculation. If the election produces a lower taxable figure, you report that result on your current-year return and check the box on Form 1040, line 6c. You do not file an amended return for the earlier year.⁷ The mechanics live in Worksheets 2 through 4 of Publication 915, compared against Worksheet 1. Once you make the election, you can only revoke it with IRS consent, so run both calculations before committing.

Where the Numbers Go on Your 1040

The Box 5 net benefits figure, not the Box 3 gross, goes on Form 1040, line 6a. If you have more than one SSA-1099, combine the Box 5 amounts. The taxable portion from the Publication 915 worksheet goes on line 6b.⁷ If your combined income is below the base amount for your filing status, enter zero on line 6b, but still report the full Box 5 figure on line 6a. The IRS wants to see both numbers even when nothing is taxable. Line 6c is the lump-sum election checkbox, and line 6d is checked when you are married filing separately and lived apart from your spouse all year.

Payments That Never Appear on an SSA-1099

Supplemental Security Income is not taxable and does not generate an SSA-1099 at all. If SSI is the only Social Security payment you receive, no tax form is issued. If you receive both regular Social Security and SSI, only the regular benefits show up on the SSA-1099; the SSI portion is excluded entirely.⁸

Nonresident aliens receive a different form, SSA-1042S, and the tax treatment is not comparable: SSA withholds a flat 30 percent on 85 percent of benefits, an effective 25.5 percent of each payment, subject to any tax treaty between the U.S. and the recipient’s country of residence.⁹ The non-taxable framework described above governs the SSA-1099, not the SSA-1042S.

1
Office of the Law Revision Counsel. 26 USC 86 – Social Security and Tier 1 Railroad Retirement Benefits
2
Social Security Administration. Taxation of Benefits When Workers Compensation/Public Disability Benefit (WC/PDB) Offset Is Involved
3
Social Security Administration. GN 05002.010 – Social Security Benefit Statement – Box 3, Benefits Paid
4
Social Security Administration. GN 05002.014 – Social Security Statement – Box 5, Net Benefits
5
Medicare. 2026 Medicare Costs
6
Internal Revenue Service. Social Security Income
7
Internal Revenue Service. Publication 915, Social Security and Equivalent Railroad Retirement Benefits
8
Internal Revenue Service. Regular and Disability Benefits
9
Social Security Administration. Nonresident Alien Tax Screening Tool (Reference) – International Programs