Form SSA-1099 Explained: What Each Box Means and What to Do With It
Every January, Social Security mails a tax form to everyone who got benefits the year before. Here is how to read it, which number the IRS wants, and how to get a copy if yours goes missing.
Form SSA-1099, the Social Security Benefit Statement, shows the total Social Security benefits you received last year. Social Security mails it every January. The number that goes on your tax return is Box 5 (net benefits), entered on line 6a of Form 1040. Getting the form does not mean you owe tax: that depends on your other income. If the form is lost, download a replacement from your my Social Security account starting February 1.
The form looks simple, but a few of its details cause real trouble at tax time. People enter the wrong box, forget the tax they already had withheld, or do not realize the Medicare premiums taken out of their checks count as income received. This guide walks through the form box by box, using the IRS's own explanation in Publication 915.
Who gets an SSA-1099
Everyone who received Social Security benefits during the year gets one. That covers retirement, spouse, survivor and disability (SSDI) benefits. A few related forms cover other situations:
| Your situation | Form you get |
|---|---|
| U.S. citizen or resident getting Social Security | SSA-1099 |
| Noncitizen who received or repaid benefits | SSA-1042S |
| Railroad retiree (Tier 1 benefits) | RRB-1099 from the Railroad Retirement Board |
| Only Supplemental Security Income (SSI) | No form. SSI is not taxable. |
If you receive both SSI and Social Security, the SSA-1099 covers only the Social Security part. Nonresident aliens who get the SSA-1042S are taxed differently: under Pub 915, 85% of their benefits are taxed at a flat 30% unless a tax treaty lowers or removes it.
Reading the form, box by box
The top of the form shows your name and Social Security number. The boxes that matter for your return are these:
| Box | What it shows | What to do with it |
|---|---|---|
| Box 3 Benefits paid | Total benefits paid to you during the year, before any repayments | Check it against your records. Do not enter it on your return. |
| Box 4 Benefits repaid to SSA | Overpayments you paid back during the year | Already subtracted in Box 5 |
| Box 5 Net benefits | Box 3 minus Box 4 | Enter on Form 1040, line 6a |
| Box 6 Voluntary federal income tax withheld | Federal tax taken out of your checks at your request | Claim it with your other withholding (Form 1040, line 25b) |
| Box 8 Claim number | The number your benefits are paid under, which may be a spouse's or parent's number | Use it if you contact Social Security about the form |
The "description of amount" section
Next to Box 3 is a breakdown that explains the total. It can list:
- Medicare premiums taken out of your benefits during the year: Part B, plus any Part C (Medicare Advantage) or Part D premiums you chose to have deducted
- Attorney fees withheld from a back-benefit award and paid directly to your attorney
- Workers' compensation offset, for disability beneficiaries whose benefits were reduced because of workers' compensation or Black Lung payments
- Nontaxable payments, such as the lump-sum death payment
- Lump-sum payments for earlier years, broken out by the year they were for
This is why Box 3 is almost always larger than the deposits you saw. You are treated as having received the full benefit, including the parts Social Security paid to Medicare, to the IRS or to your attorney on your behalf.
Where the numbers go on Form 1040
- Line 6a: the total of Box 5 from every SSA-1099 and RRB-1099 you received. A married couple filing jointly adds both spouses' forms together.
- Line 6b: the taxable part, which you figure with the Social Security Benefits Worksheet in the Form 1040 instructions (or let tax software do it). It is never more than 85% of your benefits.
- Line 6c: check this box only if you use the lump-sum election, explained below.
- Line 6d: check this box if you are married filing separately and lived apart from your spouse for the whole year. If you skip it when it applies, the IRS may send a math error notice.
- Box 6 withholding goes with the federal tax withheld from 1099 forms, so it reduces what you owe or adds to your refund.
How much is taxable depends on your combined income: half of your Box 5 benefits plus your other income, including tax-exempt interest. Under $25,000 for a single filer, or $32,000 for a married couple filing jointly, none of your benefits are taxable. Above $34,000 single or $44,000 joint, up to 85% can be. These limits are set in law and are not adjusted for inflation. Our Social Security taxable calculator runs the IRS worksheet for you, and are your Social Security benefits being taxed? explains the three tiers with examples.
One more line to know about. For tax years 2025 through 2028, people 65 and older can take an extra deduction of up to $6,000 each ($12,000 for a married couple who both qualify), reduced above $75,000 of modified adjusted gross income ($150,000 joint). On 2025 returns it is claimed on Schedule 1-A. It does not change the line 6b figure, but it can wipe out the tax on it. Married people filing separately cannot take it. See the $6,000 senior deduction calculator.
Five mistakes that lead to IRS letters
1. Using Box 3 instead of Box 5
If you repaid an overpayment during the year, Box 3 overstates your income. Line 6a is always the Box 5 figure.
2. Forgetting a spouse's form
On a joint return, both spouses' Box 5 amounts go on line 6a. Each spouse gets a separate SSA-1099, often in separate envelopes, so one is easy to miss.
3. Leaving out the Box 6 withholding
If you had tax withheld from your checks, that money has already been paid to the IRS. Leaving it off means you pay twice until the IRS sorts it out.
4. Paying tax on several years of back benefits at once
If you received a retroactive payment, such as an SSDI award covering earlier years, the whole amount counts as income in the year you got it. The IRS lets you instead figure the taxable part using each earlier year's income, through the lump-sum election in Pub 915 (Worksheets 2 to 4). You do not amend the earlier returns. If the election lowers your taxable benefits, check line 6c. Once you make it, you can only undo it with the IRS's consent.
5. Married filing separately while living together
For a married person who files separately and lived with their spouse at any time during the year, the base amount is $0. That usually makes 85% of benefits taxable. Filing separately also rules out the senior deduction.
If you repaid more than you received
When Box 4 is larger than Box 3, Box 5 shows a negative number in parentheses, and none of your benefits for that year are taxable. If you had more than one SSA-1099 or RRB-1099, a negative Box 5 on one offsets a positive Box 5 on another. If your net repayment is more than $3,000, Pub 915 lets you either itemize it as a deduction or take a credit for the tax you paid on those benefits in the earlier year (the claim of right rule, Internal Revenue Code section 1341), whichever saves more. A net repayment of $3,000 or less can no longer be deducted.
How to get a replacement SSA-1099
You can get a replacement for any of the past 6 years in which you were paid benefits:
- Online: sign in to your my Social Security account, choose "Replace Your Tax Form SSA-1099/SSA-1042S," pick the year and download it. The most recent year is available starting February 1. You can view, print or save it right away.
- Automated phone line: call 1-800-772-1213, available 24 hours a day, and say "1099" when asked how Social Security can help. This works for U.S. addresses after January 31, and the form comes by mail.
- A person on the phone or in an office: call 1-800-772-1213 (TTY 1-800-325-0778), Monday through Friday, 8 a.m. to 7 p.m., or contact your local Social Security office.
- Living abroad: create a my Social Security account with an ID.me credential, or contact the Federal Benefits Unit that serves your country.
If someone who got benefits died before the end of the year or before their form arrived, Social Security mails the SSA-1099 to the last address on their record, for use on the final tax return.
Social Security never asks for payment to send you a tax form. Treat any call, text or email offering your "1099" for a fee as a scam: see Social Security and Medicare scam red flags.
If the form looks wrong
Compare Box 3 with your benefit letters and bank deposits, remembering that Medicare premiums and withholding are included. If the amounts still do not match, contact Social Security before you file. Social Security, not the IRS, corrects the form. The IRS gets a copy of every SSA-1099, so a figure on your return that does not match will be flagged.
Want tax withheld next year?
If you owed tax this year, you can have federal tax taken out of your monthly checks so you are not hit with a large bill next April. Social Security allows 7%, 10%, 12% or 22%, and no other amounts. You can start, change or stop withholding in your my Social Security account, by phone at 1-800-772-1213, or by giving Form W-4V to Social Security (not to the IRS). The amount withheld shows up in Box 6 of next year's form. If you would rather not withhold, quarterly estimated payments with Form 1040-ES are the other option.
Frequently Asked Questions
When does the SSA-1099 arrive?
Social Security mails it every January for the benefits you received the year before. If it has not arrived, a replacement for the most recent year is available in your my Social Security account starting February 1, and through the automated phone line at 1-800-772-1213 after January 31.
Which number from the SSA-1099 goes on my tax return?
Box 5, your net benefits. Enter the total of Box 5 from all your SSA-1099 and RRB-1099 forms on line 6a of Form 1040. The taxable part, figured with the IRS worksheet, goes on line 6b. Box 3 is the gross amount before repayments and is not the number to use.
Why is Box 3 higher than what reached my bank account?
Box 3 counts benefits before deductions. Medicare premiums taken out of your check, voluntary tax withholding and any attorney fee paid from your benefits are all included in Box 3, because you are treated as having received that money. The description section of Box 3 lists those amounts.
Do I get an SSA-1099 if I only receive SSI?
No. Supplemental Security Income is not taxable, so Social Security does not send a benefit statement to people whose only payment is SSI. If you get both SSI and Social Security, the SSA-1099 shows only the Social Security part.
Does getting an SSA-1099 mean I owe tax on my Social Security?
No. Everyone who received Social Security benefits gets the form. Whether any of it is taxable depends on your combined income: half of your benefits plus your other income. Many retirees whose main income is Social Security owe no federal tax on it.
How do I get an SSA-1099 for someone who died?
If a beneficiary died before the end of the year or before the form arrived, Social Security mails the SSA-1099 to the last address on their record. It is used for any final tax return. For a lost copy, the executor or a family member can call Social Security at 1-800-772-1213.
This article explains Form SSA-1099 using IRS guidance for 2025 returns and Social Security's instructions as of October 2026. Tax rules can change from year to year. This is general educational information, not tax advice. See our disclaimer. For your own return, use the current Form 1040 instructions, a tax professional, or free IRS-certified help through VITA or Tax Counseling for the Elderly.