Tax Form SSA-1099/SSA-1042S: Boxes, Taxable Amount, and Withholding

Forms SSA-1099 and SSA-1042S are the annual tax statements the Social Security Administration mails each January to report the benefits you received the prior year. The SSA-1099 goes to U.S. citizens and resident aliens; the SSA-1042S goes to nonresident aliens.¹ Both forms show the total benefits paid, any amounts you repaid, and any federal income tax withheld, which are the figures you carry to your tax return.

What Your SSA-1099 Shows and Where Each Box Goes

The SSA-1099 covers the prior calendar year and feeds directly into Form 1040 or Form 1040-SR.² Four boxes do the work:

Box 3, Benefits Paid, is the total gross benefits the SSA paid on your behalf, including amounts deducted for Medicare premiums before the money reached your bank account. The description area beneath Box 3 itemizes those deductions.²
Box 4, Benefits Repaid to SSA, shows anything you returned during the year, such as an overpayment recovery. It reduces your taxable benefit total.²
Box 5, Net Benefits, is Box 3 minus Box 4. This is the figure you enter on line 6a of Form 1040 or 1040-SR to begin calculating the taxable portion.²
Box 6, Voluntary Federal Income Tax Withheld, is any tax the SSA withheld from your monthly payments. Report it on your return the same way you would employer paycheck withholding.²

One detail catches many filers off guard: the Box 3 figure is usually larger than what the SSA actually deposited in your account. The agency deducts Medicare Part B and Part D premiums before sending you the remainder, but the form reports the full amount before those deductions.³

How Much of Your Benefits Are Taxable

Whether any of your Social Security is taxable depends on your combined income, which is your adjusted gross income plus any tax-exempt interest plus half of your Social Security benefits.² Compare that number to the base amount for your filing status:

$25,000 for single filers, heads of household, and qualifying surviving spouses.
$32,000 for married couples filing jointly.
$0 if you are married filing separately and lived with your spouse at any time during the year, which means nearly all of your benefits will be at least partially taxable.²

If combined income stays below your base amount, none of your benefits are taxed federally. Above the base, two tiers apply. Between the base and the upper threshold ($34,000 single, $44,000 joint), up to 50% of your benefits are included in taxable income. Above the upper threshold, up to 85% become taxable. That 85% is the ceiling; no scenario taxes 100% of your benefits.¹

These thresholds have never been adjusted for inflation since Congress set them in 1984 and 1993, so more retirees find themselves above them each year.⁴

Getting Tax Withheld From Your Benefits

Social Security benefits are not withheld automatically the way wages are. If you want federal income tax pulled from your monthly payments, file IRS Form W-4V, Voluntary Withholding Request. The form offers four flat rates: 7%, 10%, 12%, or 22% of each payment.⁵

You cannot request a custom dollar amount or a percentage outside those four. If none of the rates covers your expected tax liability, you can make quarterly estimated tax payments to the IRS, either instead of withholding or in addition to it. Retirees with income from pensions, investments, or part-time work often pair a lower W-4V rate with estimated payments to avoid a large balance due at filing time.

Retroactive Awards and the Lump-Sum Election

When the SSA awards benefits retroactively, the full lump sum usually appears in Box 3 of the SSA-1099 for the year you received it. That can push your combined income well past the 85% threshold in a single year.

The IRS lets you use a lump-sum election instead. You recalculate the taxable portion by assigning the retroactive benefits back to the earlier year they were meant to cover, figure out what would have been taxable then, subtract any amount already reported for that year, and add the remainder to your current-year return. You do not amend the earlier return.²

Only use this method if it produces a lower taxable amount than the standard calculation. IRS Publication 915 has worksheets for running both side by side. If the election helps, check the box on line 6c of Form 1040 or 1040-SR.²

The SSA-1042S for Nonresident Aliens

If the IRS classifies you as a nonresident alien, you get an SSA-1042S rather than an SSA-1099, and the tax treatment is completely different. Under Chapter 3 of the Internal Revenue Code, the SSA withholds a flat 30% tax on 85% of your benefit, which works out to an effective withholding rate of 25.5% on the gross payment.¹⁶

There is no combined-income test and no lower tier. Every nonresident alien pays the flat rate on 85% of benefits regardless of total income, unless a tax treaty applies. The SSA-1042S shows your gross benefits, any repayments, net benefits, and the tax the SSA sent to the IRS on your behalf. Box 5 is your net benefits, and you report 85% of that figure on Schedule NEC of Form 1040-NR.⁷ The form also carries codes identifying the income type and the basis for any reduced rate.⁸

Treaties That Reduce or Eliminate Withholding

The United States has income tax treaties with many countries, but only a handful specifically exempt Social Security benefits from the 30% withholding. According to the SSA, the countries whose treaties fully exempt Social Security payments are:

Canada
Egypt
Germany
Ireland
Israel
Italy
Japan
Romania
United Kingdom⁹

If your country is not on the list, the default 25.5% effective rate applies. To claim a treaty benefit, file IRS Form W-8BEN with the SSA as the withholding agent. The W-8BEN establishes that you are not a U.S. person and identifies the treaty provision you are relying on.¹⁰ Without a valid W-8BEN on file, the SSA must apply the full 30% rate even if a treaty would otherwise reduce it.

Getting a Replacement or Corrected Form

Both statements are mailed between early January and January 31. If yours has not arrived by mid-February, the fastest option is your “my Social Security” account at ssa.gov, where you can download the current form plus five prior years.¹¹

You can also call 1-800-772-1213 (TTY 1-800-325-0778) and say “1099” when the automated system asks how it can help.¹² Paper copies typically arrive within ten business days, or about 30 days if you live outside the United States.¹¹

If a number looks wrong, do not alter the form or file a return using figures you know are incorrect. Contact the SSA with documentation supporting the discrepancy. If the agency confirms the error, it will issue a statement marked “CORRECTED” at the top, and you file with that version. Repayment timing matters here: a January repayment counts as prompt for the prior tax year, February and March repayments may qualify if you can show an earlier return was not possible, and repayments after March 31 generally appear on the following year’s form instead.¹³

What These Forms Do Not Cover

Supplemental Security Income is not reported on either statement because SSI is not taxable. If SSI is the only payment you receive from the SSA, no tax form is issued at all. When you receive both regular Social Security and SSI, only the Social Security portion appears on the SSA-1099.¹²

Railroad retirement is handled on a parallel set of forms. The Railroad Retirement Board issues RRB-1099 to U.S. persons and RRB-1042S to nonresident aliens for the Social Security Equivalent Benefit portion of Tier 1 payments. The SSEB portion is taxed under the same combined-income rules as Social Security, and if you receive both an RRB-1099 and an SSA-1099 in the same year, a negative Box 5 on one can offset a positive Box 5 on the other.¹⁴

When a beneficiary dies during the year, the SSA still issues an SSA-1099 for benefits paid before the death, mailed to the last address on file for the executor or surviving spouse to use on the final return. The SSA cannot advise on filing obligations for a deceased beneficiary; direct those questions to the IRS.¹¹

Finally, everything above is federal. Most states do not tax Social Security benefits, but eight still do as of 2026, and their rules vary: some follow the federal combined-income thresholds, others have their own deductions or age-based exemptions. If you live in one of those states, check your state department of revenue for the specific limits that apply to you.

1
Social Security Administration. Nonresident Alien Tax Withholding
2
Internal Revenue Service. Publication 915, Social Security and Equivalent Railroad Retirement Benefits
3
Social Security Administration. Social Security Benefit Statement – Box 3, Benefits Paid
4
Office of the Law Revision Counsel. 26 USC 86 – Social Security and Tier 1 Railroad Retirement Benefits
5
Internal Revenue Service. Form W-4V, Voluntary Withholding Request
6
Office of the Law Revision Counsel. 26 USC Ch. 3 – Withholding of Tax on Nonresident Aliens and Foreign Corporations
7
Internal Revenue Service. Instructions for Form 1040-NR
8
Internal Revenue Service. 2026 Form 1042-S
9
Social Security Administration. Nonresident Alien Tax Screening Tool
10
Internal Revenue Service. Instructions for Form W-8BEN
11
Social Security Administration. Replacement Social Security Benefit Statement
12
Social Security Administration. Get Tax Form (1099/1042S)
13
Social Security Administration. Issuing a Corrected Benefit Statement as a Matter of Equity
14
U.S. Railroad Retirement Board. Explanation of Form RRB 1099 Tax Statement