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 $2,000 or more from 2026 ($600 through 2025). 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 2025 tax law set the reporting threshold back to more than $20,000 and more than 200 transactions a year, so many casual sellers will not 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.