W-2 vs W-4: What Each Form Is, and Which One You Need

A W-4 goes in to your employer; a W-2 comes out to you. You fill in a W-4 when you start a job so your employer knows how much federal income tax to take out of each paycheck, and your employer fills in a W-2 after the year ends to report what you actually earned and what was actually withheld. So if you are starting a job or fixing your withholding, you need a W-4 — if you are filing your tax return, you need a W-2.

The difference in one line

The W-4 is an instruction. The W-2 is a receipt.

One looks forward and controls what happens to your future paychecks. The other looks backward and reports what already happened. They are not two versions of the same document, and neither one replaces the other.

A quick way to keep them straight: the 4 comes first — you hand in a W-4 at the start. The 2 comes second — you get a W-2 at the end.

If you are trying to change the size of your paycheck, you want a W-4. If you are trying to file a tax return, you want a W-2. If someone tells you to "send in your W-2" when you are being onboarded at a new job, they mean a W-4.

Form W-4: the one you fill in

Form W-4 is the Employee's Withholding Certificate. The IRS puts its job plainly: complete it "so that your employer can withhold the correct federal income tax from your pay."

It goes to your employer's payroll department and stops there. The IRS never receives it. Your employer keeps it on file — employment tax records, including Forms W-4, must be kept for at least 4 years — and uses it to calculate the federal income tax line on every paycheck until you replace it.

What the form actually asks. The current W-4 has five steps, and most people only complete two of them:

• Step 1 — name, address, Social Security number, and filing status. Required.
• Step 2 — check this if you work more than one job, or if you are married filing jointly and your spouse also works. Skipping this is the single most common cause of under-withholding, because each job otherwise withholds as though it were your only income.
• Step 3 — dependents and other credits. This *reduces* withholding.
• Step 4 — other income not from jobs, deductions beyond the standard deduction, and Step 4(c), a flat extra dollar amount withheld from each paycheck.
• Step 5 — sign it. Unsigned, it is not valid.

When to submit a new one. Publication 15 instructs employers to ask each new employee to complete the 2026 Form W-4. Beyond hiring, the IRS advice is to "consider completing a new Form W-4 each year and when your personal or financial situation changes" — a marriage or divorce, a new baby, a second job, a spouse starting or leaving work, or a large raise. There is no annual limit on how many times you can submit one.

If you never hand one in. Withholding does not stop. Under Publication 15-T, a new employee who fails to furnish a Form W-4 "will be treated as if they had checked the box for Single or Married filing separately in Step 1(c) and made no entries in Step 2, Step 3, or Step 4." That is not a penalty rate, but it ignores your dependents, your deductions, and your second job — so it is rarely the right answer for anyone.

One more thing worth knowing: a new W-4 changes future paychecks only. It does not retroactively adjust tax that has already been withheld.

Form W-2: the one you receive

Form W-2 is the Wage and Tax Statement, and filing it is your employer's legal obligation, not yours. The IRS rule is broad: "Every employer engaged in a trade or business who pays remuneration, including noncash payments, for services performed by an employee must file Form W-2 for each employee."

It is triggered when income, Social Security, or Medicare tax was withheld, when income tax would have been withheld under standard withholding rules, or when payments meet the applicable reporting threshold even with no withholding at all.

Deadlines for the 2026 tax year. Both dates land on February 1, 2027 — the usual January 31 deadline falls on a Sunday that year. Employers must furnish "Copies B, C, and 2 of Form W-2 to your employees by February 1, 2027," and must "mail or electronically file Copy A of Form(s) W-2 and Form W-3 with the SSA by February 1, 2027." Note that Copy A goes to the Social Security Administration, not directly to the IRS. Employers required to file at least 10 information returns in total — Forms W-2 plus 1099s, 1098s, 1095s and the rest, added together — must file electronically.

Why you get three copies. Copy B is attached to or entered on your federal return. Copy C is yours to keep. Copy 2 is for your state or local return.

Reading the boxes that matter:

• Box 1 — wages, tips, other compensation. This is the figure that flows onto your federal return.
• Box 2 — federal income tax withheld. This is the direct result of the W-4 you filed.
• Box 3 — Social Security wages.
• Box 5 — Medicare wages and tips.

Box 1 will often be *smaller* than Boxes 3 and 5, and that is normal, not an error. Elective deferrals — money you routed into a traditional 401(k), for example — are excluded from Box 1 but still included in Boxes 3 and 5, because they escape income tax without escaping Social Security and Medicare tax.

When your W-4 is wrong — and what your pay stub tells you

A wrong W-4 does not announce itself. It shows up as a surprise in April, and it goes wrong in two directions.

Under-withholding. Too little came out, so you owe a balance at filing. Above a certain point you can also owe an estimated tax penalty. You avoid that penalty if any one of these is true: you owe less than $1,000 in tax after subtracting withholding and refundable credits; your withholding and estimated payments came to at least 90% of the tax for the current year; or they came to 100% of the tax shown on your prior-year return, with a 110% threshold for higher-income taxpayers. The classic cause is a second job or a working spouse with Step 2 left blank on both W-4s.

Over-withholding. Too much came out, so you get a large refund. Nothing is owed and no penalty applies, but you handed the government an interest-free loan of your own money for up to a year instead of holding it across 26 paychecks.

Your pay stub is where you catch either one early. It is the running record that sits between the two forms — the W-4 sets the rule, the pay stub shows the rule being applied every payday, and the W-2 totals it up at year end. Specifically:

• The Federal Income Tax line on each stub is your W-4 in action. Change the W-4, and this line changes on the next stub.
• The year-to-date federal income tax withheld on your final stub of the year is what should appear in Box 2 of your W-2.
• Your year-to-date gross will not necessarily match Box 1, and it usually should not. Pre-tax deferrals and similar exclusions reduce Box 1 below the gross figure your stub shows.

This is also why the IRS Tax Withholding Estimator asks for exactly one thing before anything else: "your most recent paystubs for your jobs, pensions, or annuities," plus your spouse's if you will file jointly. Run it mid-year rather than in December — it will generate a pre-filled Form W-4 you can hand to payroll, and the more pay periods left in the year, the smaller the per-paycheck correction has to be. If you are behind, the simplest fix is a flat dollar amount in Step 4(c) rather than trying to re-engineer the whole form.

How to get a missing or replacement W-2

If February arrives and no W-2 has, the IRS lays out a specific escalation path. Follow it in order.

1. By the end of January, contact your employer. Confirm when the form is coming and what address or portal it went to. Most missing W-2s are stale-address problems, and a former employer is still obligated to send yours.

2. By the end of February, call the IRS at 800-829-1040. Have ready: your name, address and phone number; your Social Security or individual tax ID number; the dates you worked for that employer; and the employer's name, address and phone number. The IRS will contact your employer, request the missing W-2, and send you a substitute form.

3. File Form 4852 if the W-2 still does not arrive. Form 4852, *Substitute for Form W-2, Wage and Tax Statement*, lets you file on time without the original. You estimate your wages and the tax withheld — and your final pay stub of the year is the best source for both figures, since its year-to-date withholding is what Box 2 was going to say. A missing W-2 is not an extension; the return is still due.

4. If the real W-2 shows up later and contradicts what you filed, amend with Form 1040-X, *Amended U.S. Individual Income Tax Return*.

For prior years, use a Wage and Income Transcript. This is the fastest route for an old W-2 you need for a loan, a lease, or a back-year filing. It displays "data from information returns we receive such as Forms W-2, 1098, 1099, and 5498," and it covers the current year plus nine prior tax years. Get it through your IRS Individual Online Account, or request it by mail at 800-908-9946, which takes 5 to 10 calendar days. Two limits to know: information for the current processing year "will generally be available in the first week in February," so a transcript is no help for a W-2 that is only days late; and if you have more than roughly 85 income documents, the online account will not generate it and you will need Form 4506-T instead.

One distinction that trips people up: a transcript shows the federal data reported on your W-2, but it is not a photocopy of the form itself. If you need the actual document — with state withholding detail, for instance — request it from the employer.

Frequently Asked Questions

Which form do I actually send in with my tax return?

The W-2. You attach or enter Copy B with your federal return and Copy 2 with your state or local return. The W-4 is never filed with the IRS at all — it goes to your employer's payroll department and stays there, on file for at least four years. If you are looking for a copy of your W-4 to file, you are looking for the wrong form.

How often can I submit a new W-4?

As often as you need to. There is no annual cap. The IRS advises you "consider completing a new Form W-4 each year and when your personal or financial situation changes" — marriage, divorce, a new child, a second job, a spouse starting or stopping work, or a significant raise. Any new W-4 affects future paychecks only; it does not retroactively change tax already withheld, so submitting one in November leaves few pay periods to absorb the correction.

My employer never sent my W-2. What do I do?

Contact the employer by the end of January to confirm it was sent and to which address. If it still has not arrived by the end of February, call the IRS at 800-829-1040 with your name, address and phone number, your SSN or ITIN, the dates you worked there, and the employer's name, address and phone number. The IRS will contact the employer and send you a substitute. If nothing arrives in time, file Form 4852 using your final pay stub to estimate wages and withholding — the filing deadline does not move because your W-2 is late.

Should my last pay stub of the year match my W-2?

Partly. The year-to-date federal income tax withheld on your final stub should match Box 2 of your W-2. Your year-to-date gross pay usually will not match Box 1, and that is expected — elective deferrals such as traditional 401(k) contributions are excluded from Box 1 while remaining in Boxes 3 and 5. So Box 1 being lower than your gross pay, and lower than Boxes 3 and 5, is normal rather than a mistake.

I'm an independent contractor. Do I fill out a W-4?

No. A W-4 directs an employer's withholding, and no federal income tax is withheld from contractor pay, so there is nothing to direct. Contractors typically give the payer a Form W-9 and receive a Form 1099-NEC after year end instead of a W-2. Because no tax comes out along the way, contractors generally handle it through estimated tax payments — and the same penalty thresholds apply, including the one that spares you if you owe less than $1,000 after withholding and refundable credits.