Tax forms look intimidating, but each is just a structured receipt: a payer telling you and the IRS how much they paid you and what was withheld. Once you know what the boxes mean, your return is mostly a matter of copying numbers into the right places. This guide decodes the W-2 and the 1099 family.
The W-2: your wage and tax statement
Your employer issues one W-2 per job by January 31. The lettered boxes (a–f) identify you and the employer. The numbered boxes carry the money:
| Box | What it reports |
|---|---|
| 1 | Taxable wages — gross pay minus pre-tax deductions. This is the figure that flows to your 1040. |
| 2 | Federal income tax withheld during the year (driven by your W-4). |
| 3 | Social Security wages — capped at the annual wage base ($184,500 for 2026). |
| 4 | Social Security tax withheld (6.2% of Box 3). |
| 5 | Medicare wages — no cap, and usually higher than Box 1 because 401(k) is taxed for Medicare. |
| 6 | Medicare tax withheld (1.45%, plus 0.9% on wages over $200,000). |
| 12 | Coded items: D = 401(k), DD = employer health-coverage cost, W = HSA, and more. |
| 17 | State income tax withheld. |
Why Box 1, 3, and 5 differ
It surprises nearly everyone: the three "wages" boxes rarely match. Suppose you earn $70,000 and contribute $7,000 to a traditional 401(k) and $1,000 to health premiums. Box 1 (federal taxable) is about $62,000 — both deductions are pre-tax for income tax. Box 5 (Medicare) is about $69,000 — the 401(k) is not exempt from Medicare tax, but health premiums are. Understanding this is the key to reading any pay stub. Pre-tax retirement lowers income tax but not payroll tax; that distinction shapes the 401(k) decision in our retirement accounts guide.
The 1099 family: income without withholding
A 1099 reports money paid to you by someone other than an employer. No tax is withheld, so the responsibility to pay shifts to you. The common ones:
- 1099-NEC — Nonemployee compensation. Freelance, gig, and contractor pay of $600 or more. This income is subject to both income tax and self-employment tax.
- 1099-MISC — Rents, prizes, awards, and other miscellaneous income.
- 1099-INT — Interest of $10 or more from banks and bonds.
- 1099-DIV — Dividends and capital-gain distributions from investments.
- 1099-B — Proceeds from selling stocks, bonds, or crypto. Reports sale price and often cost basis; you compute the capital gain or loss.
- 1099-K — Payment-app and card income (PayPal, Venmo business, marketplaces). The reporting threshold has dropped sharply, so more casual sellers now receive one.
- 1099-R — Distributions from retirement accounts and pensions.
- 1099-G — Government payments such as unemployment and state tax refunds.
- SSA-1099 — Social Security benefits.
The crucial difference: who pays the tax
On a W-2 job, your employer withholds income tax and pays half of your Social Security and Medicare (7.65%), covering the other half from your check. On 1099 income, nothing is withheld and you pay the entire 15.3% self-employment tax yourself, plus income tax. That is why setting aside roughly 25–30% of contractor income is wise, and why many filers with 1099 income must pay quarterly estimated taxes. The self-employment tax calculator turns a 1099 figure into the tax you'll owe.
What to do when forms arrive
- Collect everything before filing. A late 1099 you forget is the most common cause of an IRS notice — their computers match every form to your return.
- Check the numbers. Compare each W-2 to your final pay stub and each 1099 to your own records. Errors happen; request a corrected form (W-2c or corrected 1099) if needed.
- Report all income, form or not. A missing 1099 does not make income tax-free.
- Keep them for at least three years — the standard IRS audit window.
Once your forms are in hand, the federal income tax calculator lets you plug in Box 1 wages and see your estimated tax, refund, or balance due before you file.
When a form is wrong or never arrives
If a W-2 or 1099 has an error — wrong wages, wrong SSN, wrong withholding — contact the issuer for a corrected form (a W-2c or corrected 1099) before you file; filing on bad numbers invites an IRS notice. If a form never comes, you are still required to report the income. For a missing W-2, contact your employer first, then the IRS after mid-February; you can file using your final pay stub and Form 4852 as a substitute. Keep in mind that the IRS receives its own copy of every form, so what you report should match — mismatches are the single most common trigger for an automated CP2000 notice.
Key takeaways
- Box 1 is taxable wages — lower than salary because of pre-tax benefits.
- Box 5 (Medicare wages) is the closest figure to your true gross pay.
- A W-2 has tax withheld; a 1099 does not, so you owe the tax yourself.
- Report all income whether or not a form was issued.
- Fix incorrect forms before filing, and keep every form three years.