How to Fill Out W-4 to Have Less Taxes Taken Out

To have less federal income tax taken out of your paycheck, fill out your W-4 with two numbers working in your favor: the dependent credits on Step 3 and the deductions above the standard deduction on Step 4(b). Everything else on the form either sets the baseline or, if you fill it in wrong, quietly adds withholding back. For tax year 2026, the child tax credit has risen to $2,200 per qualifying child and the state and local tax deduction cap has jumped from $10,000 to $40,400, so a W-4 you filed even a year ago is likely leaving money on the table.

What to Pull Together First

Before you touch the form, grab the most recent pay stubs from every job you and your spouse hold. They show year-to-date wages and federal tax already withheld, both of which feed the math. Pull last year’s tax return too, because the taxable income, total tax, and deduction breakdown give you a realistic starting point.

You also need the 2026 standard deduction for your filing status, because Step 4(b) only helps if your deductions exceed it:

Single or Married Filing Separately: $16,100
Married Filing Jointly: $32,200
Head of Household: $24,150

These are the 2026 inflation-adjusted figures.¹

The IRS Tax Withholding Estimator is worth ten minutes. Enter your income, tax already withheld, expected credits, and deductions, and it returns the exact figures for each W-4 line. It can even generate a pre-filled form to hand to payroll.²

Step 1: Filing Status

Your filing status sets the standard deduction and tax brackets the payroll system uses. If you qualify for Head of Household (unmarried and paying more than half the cost of maintaining a home for a qualifying dependent), choosing it over Single gives you an $8,050 larger standard deduction for 2026, which lowers withholding on every check.³ If you fill out only Step 1, sign, and skip the rest, your employer withholds based on that status with no further adjustments.⁴

Step 2: Don’t Skip This If You Have Multiple Jobs

Skipping Step 2 is the most common way people accidentally end up with a tax bill. If you hold more than one job, or you’re married filing jointly and both spouses earn wages, each job’s default withholding assumes it’s your only source of income. Combined, that almost always underwithholds. The form gives you three ways to fix it:³

Option (a) uses the IRS estimator and is the most accurate.
Option (b) is the Multiple Jobs Worksheet on page 3. You look up both salaries, find the annual extra tax, divide by pay periods, and enter the result on Step 4(c) of the highest-paying job’s W-4 only.
Option (c) is a checkbox for households with exactly two jobs total. Check it on both W-4s and each job’s payroll system uses half the standard deduction and half the tax brackets. This works well when the two paychecks are similar in size; when the gap is large, option (b) is more accurate.

Whichever method you use, fill out Steps 3 through 4(b) on only one W-4, the one for the highest-paying job. The other W-4s should leave those lines blank. Doubling up on credits or deductions across forms will over-reduce your withholding.⁵

Step 3: Claim Every Dependent Credit You’re Entitled To

This is the simplest way to shrink your withholding. Every dollar you enter reduces your projected annual tax dollar-for-dollar, and the payroll system spreads the reduction across your remaining paychecks. For 2026:

Qualifying children under 17: $2,200 each
Other dependents: $500 each

The $2,200 amount reflects the increase enacted for tax year 2025 and indexed for inflation.⁶ If your old W-4 still shows $2,000 per child, updating it alone puts more money back in each paycheck.

Income limits apply. The credit begins phasing out at $200,000 of modified adjusted gross income for single filers and heads of household, and at $400,000 for married couples filing jointly.³ Above those thresholds, enter a reduced amount or use the estimator. Overclaiming here is the fastest way to end up owing in April.

Step 3 also covers other credits you expect to claim, like education credits or the foreign tax credit. Add them to your dependent totals and enter one combined figure.

Step 4(b): Deductions Above the Standard Deduction

If your itemized deductions and certain above-the-line adjustments will exceed the standard deduction for your filing status, Step 4(b) is where you tell payroll about the excess. Calculate your total expected deductions, subtract the standard deduction, and enter the difference.

Two items changed dramatically for 2026. State and local taxes (property, income, or sales) can now be deducted up to $40,400, or $20,200 if married filing separately, as long as your total income is below $505,000 ($252,500 for married filing separately).³ That’s a large jump from the $10,000 cap in place from 2018 through 2024. In a high-tax state, this one change can add thousands to your Step 4(b) entry.

Other items that feed this line:

Medical expenses, but only the portion exceeding 7.5% of your adjusted gross income.
Mortgage interest and charitable contributions at your expected full-year totals.
Student loan interest, deductible up to $2,500 even if you don’t itemize.⁷
Traditional IRA contributions, up to $7,500 for 2026 ($8,600 if you’re 50 or older). The deduction phases out if you or your spouse are covered by a workplace retirement plan: for single filers with a plan, between $81,000 and $91,000 of income; for joint filers where the contributing spouse has a plan, between $129,000 and $149,000.⁸⁹

A quick example. You file single and expect $22,000 in deductions: $12,000 SALT, $6,000 mortgage interest, $2,500 student loan interest, and $1,500 in charitable giving. Your standard deduction is $16,100, so you enter $5,900 on line 4(b). Payroll treats $5,900 of your annual income as non-taxable and cuts withholding accordingly across the remaining paychecks.

Step 4(a) and 4(c): Leave These Alone If You Want Less Withheld

Step 4(a) is for non-wage income that doesn’t have its own withholding, like interest, dividends, or retirement distributions. An amount here increases your withholding because payroll accounts for the extra taxable income. If your goal is less withholding, leave 4(a) blank and handle that tax through quarterly estimated payments.³

Step 4(c) is a manual add-on: a flat dollar amount withheld from every paycheck on top of the formula. It’s also where the Multiple Jobs Worksheet result goes if you used Step 2(b). If you’re trying to reduce withholding and you haven’t used the worksheet, leave 4(c) at zero.

Claiming Exempt From Withholding

If you expect to owe zero federal income tax for 2026 and you owed zero for 2025, you can write “Exempt” below Step 4(c) and have no federal income tax withheld at all.³ This mostly fits low-income workers and students whose income falls below the filing threshold. To qualify, your total tax on line 24 of last year’s return must have been zero, or you weren’t required to file.

An exempt W-4 expires every year. File a new one by February 15 of the following year to keep it going. Miss the deadline and your employer reverts to withholding as if you’d filed a plain W-4 with single status and no adjustments.¹⁰ If your income situation changes mid-year and you start earning enough to owe tax, submit a revised W-4 within 10 days.¹¹

Turning It In and When You’ll See the Change

Hand the completed W-4 to HR or submit it through your employer’s payroll portal. There’s no limit on how often you can update it, and the IRS recommends reviewing your withholding every year and whenever your finances change, such as marriage, a new child, or a side job.¹²

Your employer must put the new form into effect no later than the start of the first payroll period ending on or after the 30th day from the date they received it.¹⁰ Most payroll systems handle it within one or two cycles. Check your next stub after that window and follow up with payroll if the federal tax line hasn’t dropped.

One boundary to know about: if the IRS decides your withholding is too low, it can send your employer a lock-in letter setting a minimum rate. Once that takes effect, your employer cannot honor a new W-4 that would withhold less, though you can still request more. Challenges go directly to the IRS office listed on the letter, not to payroll.¹³ These are rare.

Don’t Cut Withholding So Far You Trigger a Penalty

Reducing withholding too aggressively creates underpayment risk. The IRS charges a penalty (the federal short-term interest rate plus three percentage points) when you haven’t paid enough tax through the year.¹⁴ You avoid it by hitting any one of these safe harbors:

Your total withholding plus estimated payments covers at least 90% of your 2026 tax.
Your total payments equal or exceed 100% of the tax on your 2025 return.
If your 2025 adjusted gross income exceeded $150,000 ($75,000 if married filing separately), that prior-year test rises to 110%.
Your balance due after withholding and credits is under $1,000.

You only need to clear one of them.¹⁵

If you’re cutting your withholding for the first time, the prior-year test is the easiest to plan around. Look at line 24 of last year’s return, make sure your 2026 withholding will at least match that number (or 110% of it if you’re above the income threshold), and you’re insulated from penalties even if your actual 2026 tax comes in higher. Run the IRS estimator midyear to confirm you’re on track.

1
Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026
2
Internal Revenue Service. Tax Withholding Estimator
3
Internal Revenue Service. Form W-4 (2026) Employee’s Withholding Certificate
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Internal Revenue Service. FAQs on the 2020 Form W-4
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Internal Revenue Service. Publication 505 (2025), Tax Withholding and Estimated Tax
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Office of the Law Revision Counsel. 26 USC 24 – Child Tax Credit
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Internal Revenue Service. Topic No. 456, Student Loan Interest Deduction
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Internal Revenue Service. Retirement Topics – IRA Contribution Limits
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Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500
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Internal Revenue Service. Topic No. 753, Form W-4, Employees Withholding Certificate
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eCFR. 26 CFR 31.3402(f)(2)-1 – Furnishing of Withholding Allowance Certificates
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Internal Revenue Service. About Form W-4, Employee’s Withholding Certificate
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Internal Revenue Service. Withholding Compliance Questions and Answers
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Office of the Law Revision Counsel. 26 USC 6654 – Failure by Individual to Pay Estimated Income Tax
15
Internal Revenue Service. Underpayment of Estimated Tax by Individuals Penalty