How to Fill Out Your W-4 in 2026: A Step-by-Step Guide

The W-4 — officially called the Employee's Withholding Certificate — is the form you give your employer to tell them how much federal income tax to withhold from each paycheck. Get it right and your withholding closely matches your actual tax liability. Get it wrong and you either owe a large sum at tax time or give the IRS an interest-free loan all year.

The IRS redesigned the W-4 in 2020, eliminating the old allowances system. Many workers who filled out a W-4 before 2020 are still using outdated forms, which can cause withholding errors. Here's how to fill out the current version correctly.

Step 1: Personal Information (Required)

Enter your legal name, address, Social Security number, and filing status. Your filing status is the most important field on the entire form — it determines which withholding table your employer uses. Choose from:

• Single or Married filing separately — use this if you are unmarried, or if you are married but file separately from your spouse
• Married filing jointly or Qualifying surviving spouse — use this if you are married and file a joint return
• Head of household — use this if you are unmarried and pay more than half the cost of maintaining a home for a qualifying person (such as a child)

For Texas workers, filing status affects only your federal withholding — there is no state income tax to worry about. Choosing the wrong filing status is the single most common W-4 mistake and can result in hundreds of dollars of under- or over-withholding per year.

Step 2: Multiple Jobs or Spouse Works (Complete If Applicable)

If you have more than one job at the same time, or if you are married and your spouse also works, you need to complete Step 2. This step exists because the standard withholding tables assume you have only one job — if you have two, your combined income pushes you into a higher bracket, but each employer withholds based on only their portion of your income.

There are three ways to handle this:

Option A (Recommended for privacy): Check the box in Step 2(c). This tells your employer to use the higher withholding rate for single filers, which over-withholds slightly but ensures you won't owe at tax time. Neither employer knows about your other job.

Option B: Use the IRS Tax Withholding Estimator at irs.gov/W4App to calculate the exact additional withholding needed, then enter that amount in Step 4(c).

Option C: Use the Multiple Jobs Worksheet on page 3 of the W-4 to calculate additional withholding. This is the most accurate method but requires you to share income information between jobs.

If you leave Step 2 blank and have multiple jobs, you will almost certainly under-withhold and owe taxes in April.

Step 3: Claim Dependents (Optional)

If your total income is $200,000 or less (single) or $400,000 or less (married filing jointly), you can claim the Child Tax Credit and Other Dependents Credit here. For each qualifying child under age 17, enter $2,000. For each other qualifying dependent (such as an elderly parent you support), enter $500.

These credits reduce your withholding — meaning more money in each paycheck, but less withheld toward your tax bill. Only claim these if you are confident you will qualify for the credits when you file your return.

Step 4: Other Adjustments (Optional)

Step 4 has three sub-sections:

4(a) — Other income: If you have significant income not subject to withholding (freelance work, investment income, rental income), enter the annual amount here. Your employer will withhold extra to cover the tax on that income.

4(b) — Deductions: If you plan to itemize deductions (mortgage interest, large charitable contributions, state and local taxes — though Texas has no income tax, so SALT is less relevant here), enter the amount above the standard deduction. Most Texas workers should leave this blank.

4(c) — Extra withholding: If you want additional withholding taken from each paycheck — for example, to cover a side gig or to avoid a tax bill — enter a flat dollar amount here. This is the simplest way to ensure you don't owe at tax time.

Step 5: Sign and Date

Sign and date the form. Give it to your employer's HR or payroll department — do not send it to the IRS. Your employer is required to implement the new withholding within the first payroll period that ends on or after the 30th day after you submit the form.

Common W-4 Mistakes Texas Workers Make

How Often Should You Update Your W-4?

The IRS recommends reviewing your W-4 whenever you have a major life change: marriage, divorce, birth of a child, starting a second job, or a significant change in income. You can submit a new W-4 at any time — there's no limit on how often you can update it, and your employer is required to implement the change within 30 days.

A good annual habit is to run the IRS Withholding Estimator in January or February, after you've received your W-2 from the prior year. This lets you see whether your withholding was accurate and adjust before the new year gets too far along.

Check Your Withholding With Our Calculator

After updating your W-4, use our Texas paycheck calculator to estimate what your new take-home pay will look like. Enter your wage, filing status, and any pre-tax deductions to see a detailed breakdown of your 2026 federal withholding.