Whether it’s better to claim 1 or 0 on your W-4 is a question the current federal form no longer lets you answer directly. The IRS removed allowances from Form W-4 in 2020, so there is no line where you enter a number like 0 or 1. The trade-off behind the question still exists though. To recreate what claiming 0 used to do — maximum withholding and a bigger refund — complete only Steps 1 and 5 and leave the rest blank. To recreate what claiming 1 did — a little less withheld and slightly larger paychecks — enter dependent credits in Step 3 or itemized deductions above the standard deduction in Step 4(b). If you want even more taken out than the “blank form” default, add a flat dollar amount in Step 4(c).
What Claiming 1 or 0 Used to Do
On the pre-2020 W-4, each allowance shielded a fixed slice of your wages from federal income tax, tied to the personal exemption amount. Zero allowances shielded nothing, so your employer withheld the most possible. One allowance shielded a small amount, so withholding dropped slightly and your paycheck grew slightly.
Neither was inherently better. Zero produced a bigger refund in April but less cash during the year. One brought withholding closer to your actual tax bill, leaving less to reconcile at filing time. The decision came down to whether you preferred forced savings or more money in each check. That trade-off is still yours to make. Only the levers changed.
Why the Choice Disappeared
The Tax Cuts and Jobs Act of 2017 nearly doubled the standard deduction and eliminated personal exemptions. Because allowances were pegged to the personal exemption, the math behind them stopped working. The IRS redesigned Form W-4 for 2020 and switched to dollar-amount entries for credits, other income, and deductions. Federal withholding is now calculated under procedures set by the Treasury Department rather than the old allowance tables.1Office of the Law Revision Counsel. 26 US Code 3402 – Income Tax Collected at Source
How to Get the “Claim 0” Effect Today
If your goal is to avoid owing at tax time, complete only Step 1 (name, address, Social Security number, filing status) and Step 5 (signature). Leave Steps 2, 3, and 4 blank. Your employer will withhold based on your filing status alone, with the standard deduction built into the tables and no reductions for credits or extra deductions.2Internal Revenue Service. Form W-4 Employees Withholding Certificate For most single filers with no dependents, this produces withholding close to or slightly above the actual tax owed — the modern equivalent of the old zero-allowance setting.
Want more taken out than that? Enter a flat dollar amount in Step 4(c). That amount comes out of every paycheck on top of the calculated withholding. Some people use it as forced savings to guarantee a refund. The trade-off is real though: you’re lending the government money interest-free until you file.
How to Get the “Claim 1” Effect Today
To reduce withholding the way one allowance used to, use Step 3 and Step 4(b).
Step 3 handles dependents. Multiply each qualifying child under 17 by $2,200 and each other dependent by $500, then enter the total. Every dollar entered here reduces your annual withholding dollar-for-dollar. These credits apply if your total income is $200,000 or less, or $400,000 or less for joint filers.2Internal Revenue Service. Form W-4 Employees Withholding Certificate
Step 4(b) handles itemized deductions above the standard deduction. For 2026, the standard deduction is $16,100 for single filers, $32,200 for married couples filing jointly, and $24,150 for heads of household.3Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026 Including Amendments from the One Big Beautiful Bill If your mortgage interest, state and local taxes, charitable contributions, and other deductible expenses will exceed your standard deduction, enter the difference in Step 4(b). Your employer will treat that much less of your wages as taxable when calculating withholding.
Be cautious. Overestimating deductions or a mid-year income change can leave you underwithheld and owing at filing time, potentially with a penalty.
The Real Cost of Over-Withholding
A refund feels like a bonus, but it’s your own money coming back with no interest attached. The average refund during the 2026 filing season was roughly $3,700. That is more than $300 a month that could have sat in a savings account, paid down a credit card, or covered expenses as they came up.
Whether over-withholding is worth it depends on your habits. If the alternative is spending the extra cash and reaching April with nothing set aside, a big refund has real behavioral value. If you’re carrying credit card debt at 20% or more, deliberately over-withholding by thousands works against you. The IRS Tax Withholding Estimator can help you land close to your actual liability so neither the refund nor the balance due is large.4Internal Revenue Service. IRS Tax Withholding Estimator Helps Taxpayers Get Their Federal Withholding Right
The Risk of Withholding Too Little
Reduce withholding too far and the IRS can charge an underpayment penalty under 26 U.S.C. § 6654, calculated at the federal short-term rate plus three percentage points, which was 7% in early 2026.5Internal Revenue Service. Quarterly Interest Rates You avoid the penalty if you meet any of these safe harbors:
- You owe less than $1,000 after subtracting withholding and credits.6Office of the Law Revision Counsel. 26 USC 6654 – Failure by Individual to Pay Estimated Income Tax
- Your total withholding and estimated payments equal at least 90% of what you owe for the year.
- Your payments equal at least 100% of the tax on your prior-year return, or 110% if your prior-year adjusted gross income exceeded $150,000 ($75,000 if married filing separately).7Internal Revenue Service. Instructions for Form 2210
The prior-year safe harbor is the most reliable option for anyone with unpredictable income, because it protects you even if this year’s income climbs. This is where the old instinct to “just claim 0 and be safe” came from. Maximum withholding almost always cleared these thresholds without any planning.
If You Have Two Jobs or a Working Spouse
Multi-job households are where the old “just pick 1 or 0” habit did the most damage, because each payroll assumed it was your only source of income and underwithheld as a result. Step 2 on the current form addresses this with three options:2Internal Revenue Service. Form W-4 Employees Withholding Certificate
- Use the IRS Tax Withholding Estimator at irs.gov/W4App. This is the most accurate option, especially with self-employment income or a mid-year job change.
- Check the Step 2(c) box on the W-4 for both jobs when there are exactly two jobs total. Works best when the lower-paying job earns more than half what the higher-paying one does.
- Use the Multiple Jobs Worksheet for up to three jobs, particularly when there’s a large pay gap. For four or more jobs, go back to the online estimator.
Whichever method you pick, fill in Steps 3 and 4 only on the W-4 for your highest-paying job. On the others, complete just Steps 1 and 5. Claiming the same dependent credits on multiple W-4s is one of the most common mistakes and almost guarantees you’ll owe money at filing time.
State Forms May Still Use Allowances
The federal form left allowances behind, but a number of state withholding forms still use them. If your state has an income tax, you may fill out a separate state form that asks you to choose a number of allowances, and the old logic applies there: more allowances means less state tax withheld, fewer means more. The “1 or 0” question can still be a live one for your state paycheck even though it no longer exists for federal purposes. Check with your employer or your state’s department of revenue for the right form.
When to Redo Your W-4
You can submit a new W-4 to your employer any time, as often as you want. The IRS specifically recommends rechecking your withholding after marriage, divorce, the birth or adoption of a child, buying a home, retirement, or starting or stopping a second job.8Internal Revenue Service. Tax Withholding – How to Get It Right Once your employer receives the updated form, the change must take effect no later than the start of the first payroll period ending on or after the 30th day after receipt.9Internal Revenue Service. Publication 15 (Circular E) Employers Tax Guide Check a pay stub after that window to confirm the new numbers are actually in place.