Should I Claim 0 or 1 on My W-4? The Answer Has Changed

You cannot claim 0 or 1 on the current W-4. The IRS redesigned Form W-4 in 2020 to eliminate allowances entirely. The new W-4 uses a five-step system based on filing status, multiple jobs, dependents, and other adjustments. If someone tells you to "claim 0" for maximum withholding or "claim 1" for a little less, they are referencing the old form - which no longer applies to anyone filling out a new W-4 today.

How the old allowance system worked

Before 2020, the W-4 asked you to enter a number called allowances. Each allowance reduced the amount of income your employer used to calculate your withholding. The logic was roughly:

• Claiming 0 allowances: No income excluded. Maximum withholding. More tax withheld from every paycheck, larger refund at the end of the year (assuming you were over-withheld).
• Claiming 1 allowance: Roughly equivalent to the personal exemption for yourself. Slightly less tax withheld per paycheck.
• Claiming more allowances: Each additional allowance further reduced withholding. People with dependents typically claimed higher numbers.

This system worked reasonably well when personal exemptions existed. But the Tax Cuts and Jobs Act of 2017 eliminated personal exemptions starting in 2018, making the old allowance framework mathematically disconnected from how tax was actually calculated.

Why the IRS changed the W-4

The IRS redesigned the W-4 effective January 1, 2020, for two primary reasons:

1. Personal exemptions no longer exist: The TCJA suspended personal exemptions through 2025 (and the OBBBA extended this framework into 2026). Allowances were tied to personal exemptions. Once those went away, the allowance system produced inaccurate withholding for many filers.
2. Allowances confused people: The IRS found that many workers did not understand what allowances meant or how to calculate the right number. This led to widespread under- and over-withholding.

The new form uses dollars instead of an abstract allowance count, making it more transparent and more accurate.

How the new W-4 works

The current W-4 has five steps. Only Steps 1 and 5 are required for everyone. Steps 2, 3, and 4 are optional and apply to specific situations.

• Step 1 - Personal information: Your name, address, Social Security number, and filing status (Single, Married Filing Jointly, or Head of Household). Required for everyone.
• Step 2 - Multiple jobs or spouse works: Complete this only if you have more than one job at the same time, or if you are married and your spouse also works. Leaving this blank when you have two jobs will result in significant under-withholding.
• Step 3 - Claim dependents: Enter a dollar amount for the Child Tax Credit or other dependents. This reduces your withholding to account for credits you will claim on your return.
• Step 4 - Other adjustments (optional): Three sub-items: (a) other income not subject to withholding, (b) deductions you expect to itemize beyond the standard deduction, and (c) additional dollar amount to withhold per pay period.
• Step 5 - Sign and date: Required. The form is invalid without a signature.

How to get maximum withholding

On the old form, "claiming 0" maximized withholding. On the new form, the equivalent approach is:

1. Complete Step 1 with your personal information and choose "Single" (even if your actual status is something else - but note this may cause other issues; the legitimate approach is to use Step 4(c) instead).
2. Leave Steps 2, 3, and 4(a)/(b) blank.
3. In Step 4(c), enter an additional dollar amount to withhold per paycheck. The more you enter, the more is withheld.
4. Sign in Step 5.

The cleanest approach: complete your actual information in Step 1, leave Steps 2-4 blank, and if you want extra withheld, add a specific dollar amount in Step 4(c). You can use the IRS Tax Withholding Estimator to calculate the right number.

How to reduce withholding

On the old form, claiming more allowances reduced withholding. On the new form, you reduce withholding by entering amounts in Step 3 (for credits you expect to claim) or Step 4(b) (for deductions beyond the standard deduction). Both of these tell your employer to withhold less per paycheck because your actual tax bill will be lower.

For 2026, the standard deduction for a single filer is $16,100. If you expect to take only the standard deduction and have no dependents, the default withholding from completing just Steps 1 and 5 already accounts for this.

Common mistakes

• Using an outdated form: Some employers or online guides still reference the old W-4. Always use the current version from IRS.gov.
• Leaving Step 2 blank with two jobs: This is the most common under-withholding mistake. If you have two jobs simultaneously, you must complete Step 2 or you will owe taxes at filing time.
• Entering dependents when you have none: Adding dependents in Step 3 reduces withholding. If you do not actually have qualifying dependents, you may end up owing money.
• Never updating your W-4: Life changes (marriage, divorce, new child, second job) affect your tax situation. Review your W-4 any time your circumstances change.