W-4 for a New Job: 2026 Step-by-Step

When you fill out Form W-4 at a new job, you tell your employer how much federal income tax to withhold from each paycheck.

Getting this right on day one matters because your employer cannot refund over-withheld tax mid-year — only the IRS can, at filing. And if you under-withhold, you may owe a balance plus underpayment penalties (currently ~8% APR).

Step 1: Personal info

Name, SSN, address, filing status. Choose "Head of Household" (not single) if you're unmarried and support a qualifying dependent — this unlocks a larger standard deduction ($23,850 vs $16,100 in 2026) and wider brackets.

Step 2: Multiple jobs or spouse works

Skip this at a first/only job. If you also have a second job or your spouse works, you'll need to complete this step (see our W-4 for Second Job guide).

Step 3: Claim dependents

Multiply qualifying children under 17 by $2,000 (Child Tax Credit) and other dependents by $500 (Credit for Other Dependents). Enter the total. This reduces your withholding so you keep the credit in your paycheck instead of waiting for a refund.

Step 4: Other adjustments

4(a): Add other taxable income not subject to withholding (1099, investment income). 4(b): Estimated itemized deductions above the standard deduction. 4(c): Additional federal tax withholding per paycheck (use if you want to be over-withheld intentionally to force a refund).

Worked example

Scenario: Single, $65,000/yr salary, starting July 1 (mid-year). No other jobs, no dependents.

Annualized projection: $65,000 × 12/6 = $130,000 annualized — but you've only earned $0 from Jan–Jun. If you don't adjust, the employer will withhold based on $130K annual rate (about $23K/yr ÷ 26 = $890/paycheck). You'd over-withhold by ~$7,000 for the year because your actual income is $32,500 (half year).

Fix: Use Step 4(b) to enter estimated deductions of $30,000 (phantom). This tells the employer to withhold as if your taxable income is $100K annualized, closer to your actual $32,500 for the half-year. Or simply accept the over-withholding and get the refund at filing.

OBBBA 2026 notes

Overtime pay (hours beyond 40/week) and tips are federally tax-exempt in 2026 for W-2 employees. Social Security and Medicare still apply to both. The exemption is applied at filing, not at withholding — so if you earn a lot of OT, you'll be over-withheld during the year and get a refund.