The 2026 W-4, line by line

The form stopped using allowances in 2020

If you learned to fill in a W-4 by "claiming zero" or "claiming two", that form no longer exists. Allowances were removed in 2020 and replaced with a form that asks for dollars and for facts about your household, then converts those directly into a withholding amount.

The change was made because allowances had become untethered from anything. An allowance was originally tied to a personal exemption, and when personal exemptions were eliminated the allowance had no underlying quantity to represent — so a number of allowances no longer corresponded to anything computable.

The current form has five steps. Steps 1 and 5 — your details and your signature — are required of everyone. Steps 2, 3 and 4 are conditional, and a form with only 1 and 5 completed withholds as though your job were your only income and you had no dependants and no adjustments.

That default is right for a single person with one job and no dependants, and wrong for almost everyone else. It is also what you get by leaving the form alone, which is why so many households discover a systematic mismatch years after starting a job.

You may file a new one at any time and as often as you like. Employers must apply it within a short period, and it takes effect going forward rather than retroactively — which makes January far more powerful than November for the same change.

Step 1: the status that everything else is computed from

Name, address, Social Security number and filing status. The status should be the one you will actually file under, not the one that feels safest — the withholding tables are built around it, and a mismatch propagates through every other step.

Selecting single when you will file jointly over-withholds, because the joint standard deduction of $32,200 is double the single one and the joint brackets are twice as wide at the lower end. The result is a large refund and a year of reduced monthly income.

The reverse — selecting married when you will file separately, or when the household has two substantial incomes — under-withholds, and it is the more expensive error because it produces a bill.

Head of household is available to an unmarried person maintaining a home for a qualifying dependant, and it carries a standard deduction of $24,150 — between the single and joint amounts. It is frequently unclaimed by people entitled to it, usually because they assume it requires being a parent in a specific arrangement rather than meeting a defined test.

There is also a checkbox in Step 2 for married couples where both work and the salaries are roughly similar. Ticking it on both forms applies a set of tables designed for exactly that case, and it is the simplest available fix for the most common cause of under-withholding.

Step 2: the step that prevents most April bills

This is where a household accounts for having more than one income, and leaving it blank is the single commonest cause of owing money at filing.

The mechanism is straightforward once seen. Each employer withholds as though its salary were your only income, so each applies the full standard deduction of $16,100 and starts you again at the lowest bracket. Two jobs means the deduction has been applied twice and the low brackets twice — and the shortfall is roughly the tax on $16,100 at your real marginal rate, plus the bracket effect.

Three options are offered, in decreasing order of accuracy. The online estimator, which handles the case properly. The worksheet on page 3 of the form, which is accurate and tedious. Or the checkbox in 2(c), which is the simplest and works well when the two salaries are roughly comparable.

The checkbox has to be ticked on both forms, not one. Ticking it on only one produces a half-correction and a residual shortfall, which is worse than either extreme because it looks as though the problem was addressed.

The same applies to a spouse starting work mid-year, which is the version that catches households by surprise. Both employers begin withholding as though their salary were the only income, the mismatch runs for half a year rather than a full one, and it is therefore small enough to miss and large enough to notice.

Steps 3 and 4: dependants, other income and the direct lever

Step 3 is dependants, entered as dollars of credit rather than as a count. $2,200 for each qualifying child under 17 and $500 for each other dependant, added together. A household with two young children enters $4,400, and withholding falls by that amount across the year.

Claim it on one form only. In a two-earner household where both complete Step 3, both employers reduce withholding by the full amount and the household is under-withheld by the entire credit — usually the higher-paying job is the right place for it.

Step 4(a) is other income that nothing withholds against: interest, dividends, self-employment profit, rental income. Entering it here withholds against it through your salary, which is simpler than making quarterly estimated payments and is treated as paid evenly across the year regardless of when it happened.

Step 4(b) is deductions above the standard amount, for people who itemise. Enter the excess over $16,100 single or $32,200 joint, not the total — entering the total is a common error and produces substantial under-withholding.

Step 4(c) is extra withholding per pay period, in dollars, and it is the most reliable tool on the form. It moves the number directly instead of moving an input to a table. A $1,300 shortfall on a fortnightly schedule is $50 entered here, and it closes exactly.

The exact entries for five common situations

One job, single, no dependants. Steps 1 and 5 only. The default is correct and anything else makes it worse.

Married, both working, similar salaries. Step 1 married filing jointly, tick the box in Step 2(c) on both forms, Step 3 on the higher-paying job only if you have dependants. This is the case the checkbox was designed for.

Married, one income, two children. Step 1 married filing jointly, Step 2 blank, Step 3 entering $4,400. Withholding falls by that amount across the year, which is the credit arriving in your pay rather than as a refund.

Salary plus freelance income. Step 4(a) with the expected annual profit, or — usually better — leave 4(a) blank and put an amount on 4(c) covering both the income tax and the self-employment tax on it. That avoids quarterly estimated payments entirely and counts as paid evenly across the year.

Last year produced a bill. If nothing has changed, take that bill, divide by your pay periods, and enter it on 4(c). On $85,000 of salary with a federal liability of $9,870, closing a $1,000 gap costs $38 a fortnight — trivial spread across a year, unpleasant as a single April payment.

The state form is a separate one

Completing the federal W-4 carefully and leaving the state form at its default is a common way to end up correctly withheld federally and wrong at state level — and because the state bill is smaller, the error usually persists for years.

States do not share a form. Several accept the federal W-4, several publish their own with different questions, and a few still use allowances that the federal form abolished — so an employee filling in both on the same day can be answering contradictory questions.

The size of what is at stake varies from nothing in the 9 states with no income tax to a substantial line in the highest-rate states. On $85,000 the state layer runs up to $6,604.

And in eleven states there is a local line withheld by the employer as well, with rules that differ from both. Michigan taxes non-residents at exactly half the resident rate; Ohio municipalities tax where the work is performed with a credit at home that is sometimes partial; Indiana fixes your county as of 1 January.

The check takes one payslip: find the state line, multiply by your pay periods, and compare it against what your state's page here says you owe. If the two are far apart, the state form is where to look — not the federal one.

Five ways the form gets filled in wrong

Leaving Step 2 blank with two incomes. The single largest cause of an April bill. Both employers apply the standard deduction and the lowest brackets, so both are individually correct and jointly wrong by a predictable amount.

Both spouses completing Step 3. Each employer reduces withholding by the full dependant credit, so the household is under-withheld by the entire amount. Claim it on one form, usually the higher-paying job.

Entering total itemised deductions in Step 4(b). The field wants the excess over the standard deduction, not the total. Entering $24,000 instead of $7,900 under-withholds by the tax on $16,100.

Choosing a status that does not match the return. Selecting single when you will file jointly over-withholds all year; the reverse under-withholds and produces a bill. The status is what the whole table is built on.

Filling it in once and never again. Withholding is set by a form you completed under circumstances that have since changed — a second job, a birth, a spouse's new salary, a house. Each moves the number, and none of them prompts you to revisit it.

Claiming exempt, and when it is legitimate

The form allows claiming exemption from federal income tax withholding, and the conditions are narrow: you had no tax liability last year and expect none this year. Not a small liability — none.

That is a genuine position for some people. A student working a summer job whose annual income falls below the standard deduction of $16,100 will owe no federal income tax, and withholding from those paychecks is simply money lent until the following spring.

It is not a way to increase take-home pay for someone who will owe tax. Claiming exempt while having a liability produces an April bill, and where the shortfall is large it can carry an underpayment penalty on top.

The exemption also expires. It must be renewed each year by a specific date, and an employer receiving no renewal reverts to withholding as single with no adjustments — which for someone who genuinely qualified means over-withholding until they notice.

Note it applies only to federal income tax withholding. FICA continues regardless: 7.65% of wages from the first dollar, with no exemption available at any income.

The form for people who are not employees

The W-4 is for employees. If nobody is withholding for you, the equivalent obligation is estimated tax payments — four times a year, self-directed, with no bill and no reminder.

A W-4P covers withholding from pensions and annuities, and a W-4R covers withholding from retirement distributions. Both are elective, and electing zero is easy to do once and forget — which is how a retiree ends up owing at filing with nothing having been withheld all year.

A W-9 is a different thing entirely and is often confused with the W-4: it supplies your taxpayer identification number to someone who will pay you as a contractor, so that they can report the payments. It causes no withholding at all, which is precisely the point people miss when they assume signing one means tax is being handled.

A household with both a salary and untaxed income has the better option, and it is worth knowing: put the untaxed income on Step 4(a) of the W-4, or an equivalent amount on 4(c), and withhold against it through the salary. That removes four deadlines and counts as paid evenly across the year.

That last property is the one that matters when something goes wrong late. An underpayment discovered in November can be fixed through withholding as though it had been paid since January; an estimated payment made in November cannot.

Working out the two-job adjustment yourself

If you would rather understand the number than tick a box, the arithmetic is not difficult and it makes the size of the problem visible.

Add both salaries. Compute the tax on the combined figure using the brackets and your filing status. Then compute the tax each employer will withhold, which is the tax on each salary treated as though it were your only income. The difference between the total owed and the sum of the two withholdings is your annual shortfall.

Divide that shortfall by the number of pay periods remaining in the year, and enter it on Step 4(c) of one of the two W-4s. That closes it exactly, and it is more accurate than the checkbox when the two salaries are very different in size.

The reason the shortfall exists in the arithmetic is visible once you do it: the standard deduction of $16,100 has been applied twice, and the lowest brackets have been used twice. Both employers did exactly what they were supposed to do.

The checkbox in Step 2(c) approximates this by applying a different set of tables, and it works well when the two salaries are roughly comparable. When one is much larger, the manual method or the online estimator is materially more accurate.

Where the figures in this guide come from

Every number above comes from the IRS Form W-4 and its instructions and IRS Rev. Proc. 2025-32, § 3.01, Tables 1-4, read off the document itself rather than off a summary of it. The dollar examples are computed from the current brackets rather than carried over from previous guidance, which is where most W-4 advice goes wrong — it describes the pre-2020 form.

That distinction is not pedantry. When we audited this category in August 2026, sites ranking on the first page for "2026 income tax calculator" were publishing a standard deduction of $15,200 single — the previous year's figure — while linking to the correct IRS page from the same screen.

State figures were read one state at a time off each department of revenue's own publication. Of 37 states reviewed, 21 matched the compiled sources everyone uses and 12 did not. The errors were overwhelmingly about timing rather than structure: rates superseded by legislation passed after the compilation, several of them backdated to 1 January.

So each figure on this site carries the document it came from and the date it was checked, and where something has not yet been read off a primary source the page says so rather than implying it has. "We have not looked" and "it does not exist" are different claims, and only one of them is a reason to stop looking.

The check we would suggest running on anything you read about the W-4, here included: find the underlying figure, and compare it against the source it claims to come from. It takes two minutes and it settles the question that no amount of confident writing can.

A checklist before you hand the form back

Does the status match the return you will file? Not the one that feels safest — the actual one. Everything else in the table is built on it.

Is there more than one income in the household? If yes, Step 2 needs completing, on both forms if you are using the checkbox. Leaving it blank is the single most common cause of an April bill.

Are dependants claimed once, not twice? Step 3 on one form only, usually the higher-paying job. Both spouses completing it under-withholds by the entire credit.

Is there income nobody withholds against? Freelance work, interest, dividends, rent. Step 4(a), or an equivalent amount on 4(c) — and the second option is generally better because it counts as paid evenly across the year.

Did last year end with a surprise? Divide it by your pay periods and put it on Step 4(c). And then file the state form as well, which is a separate election that is frequently left at a default nobody chose.

Questions

How do I fill out a W-4 in 2026?

Steps 1 and 5 are required. Step 2 if there is more than one income in the household — this is the one that prevents most April bills. Step 3 for dependants, entered as dollars: $2,200 per qualifying child. Step 4 for other income, extra deductions, or a direct per-paycheck adjustment on 4(c).

What happened to allowances on the W-4?

They were removed in 2020. An allowance was tied to the personal exemption, and when personal exemptions were eliminated the allowance no longer represented anything computable. The form now asks for dollars and household facts instead. Advice about "claiming zero" describes a form that has not existed for six years.

Should both spouses claim dependants on their W-4?

No — claim them on one form only, usually the higher-paying job. If both complete Step 3, both employers reduce withholding by the full credit and the household is under-withheld by the entire amount, which turns an expected refund into a bill.

How do I get more tax withheld?

Step 4(c): an extra dollar amount per pay period. Take the shortfall, divide by the number of pay periods remaining in the year, and enter it. It is more reliable than adjusting any other field because it changes the number directly rather than changing an input to a table.

How often should I update my W-4?

Whenever something changes: marriage, divorce, a birth, a second job starting or ending, a spouse's job changing, a large bonus, or a year that ended with a surprise. Changes take effect going forward only, so January does far more work than November for the same adjustment.

Does the W-4 cover state withholding?

Not usually. Several states accept the federal form, several publish their own, and a few still use allowances the federal form abolished. It is a separate election, it is frequently left at a default that does not match, and the mismatch persists quietly because the amounts are smaller.