How to Fill Out a W-4 for Your First Job: Step by Step

For most first-job workers who are single with no dependents, the W-4 is simple: enter your name, address, and Social Security number in Step 1, check "Single or Married Filing Separately" for filing status, and sign in Step 5. Steps 2 through 4 can usually be left blank. That is it. This guide walks through every step so you understand what you are filling out and when each part matters.

Step 1 - Personal information

Step 1 is required for everyone. It collects three things:

• Name and address: Enter your legal name (as it appears on your Social Security card) and your current mailing address.
• Social Security number: Required for your employer to report your wages to the IRS and Social Security Administration. Do not leave this blank.
• Filing status (checkbox): Three options appear on the form. For a first-job worker:
  • Single or Married Filing Separately: Choose this if you are unmarried. This is the correct box for most first-job workers.
  • Married Filing Jointly or Qualifying Surviving Spouse: Choose this only if you are married and will file jointly with your spouse.
  • Head of Household: Choose this only if you are unmarried, pay more than half the cost of keeping up a home, and have a qualifying person living with you (typically a dependent child).

When in doubt, "Single or Married Filing Separately" is the right choice for an unmarried person with no dependents. It produces the highest default withholding among the three options, which means you are less likely to underpay and owe money at filing time.

Step 2 - Multiple jobs or spouse works

Step 2 only applies if you have more than one job at the same time, or if you are married filing jointly and your spouse also has income.

First job, no other jobs: leave Step 2 completely blank.

If you do have two jobs simultaneously, you must complete Step 2, or each employer will withhold as if your income from that job is your entire annual income. The combined result will be too little total withholding, and you will owe taxes when you file your return - potentially with a penalty.

Three options are available in Step 2:

• Option A (checkbox): Use the IRS Tax Withholding Estimator online and enter the result in Step 4(c). Most accurate method.
• Option B (checkbox): Check the box. Your employer withholds at a higher rate using IRS tables designed for multiple-income households.
• Option C: Use the Multiple Jobs Worksheet on page 3 of the W-4 instructions to calculate an additional withholding amount and enter it in Step 4(c).

Option B is the simplest. Option A is the most accurate. For a first job with no other income, use none of them.

Step 3 - Claim dependents

Step 3 reduces your withholding by accounting for tax credits you expect to claim when you file your return.

First job, no children or dependents: leave Step 3 blank.

If you do have qualifying children or other dependents, Step 3 lets you reduce your withholding to account for the credits you will claim. For2026, the Child Tax Credit is $2,200 per qualifying child under 17. Entering this amount in Step 3 tells your employer to withhold less, because your tax bill at filing time will be reduced by those credits.

Do not enter amounts in Step 3 if you do not actually have qualifying dependents. Doing so reduces your withholding without a corresponding credit to offset it, resulting in a tax bill at filing time.

Step 4 - Other adjustments (optional)

Step 4 has three sub-items, all optional:

• Step 4(a) - Other income: If you have income that is not subject to withholding (freelance work, interest, dividends, rental income), enter the estimated annual amount here. This tells your employer to withhold extra to cover that additional tax. Most first-job workers with only one employer leave this blank.
• Step 4(b) - Deductions: If you plan to itemize deductions (claiming amounts greater than the $16,100 single standard deduction in 2026), you can enter your estimated excess deductions here to reduce withholding. Very few first-job workers itemize. Leave blank if you are taking the standard deduction.
• Step 4(c) - Extra withholding: Enter a specific dollar amount to withhold per pay period above the standard calculation. Use this if you want a larger refund, have extra income from Step 4(a) that you want to cover through payroll, or simply want a cushion against owing at filing time.

For a typical first-job worker: leave all of Step 4 blank. The default withholding from Steps 1 and 5 alone is calibrated to be close to your actual tax liability for a single filer with one income source.

Step 5 - Sign and date

Step 5 is required. Sign and date the form. The form is legally invalid without a signature. Your employer cannot process a W-4 without it.

By signing, you certify under penalty of perjury that the information is correct. This is particularly important for the exempt withholding claim mentioned in Step 4 - falsely claiming exempt is a federal violation.

Common mistakes on the first W-4

• Leaving the SSN blank: Some people feel uncomfortable writing their SSN on paper. It is required. Your employer reports wages to the IRS and Social Security Administration using your SSN.
• Entering dependents when you have none: This is a common mistake by workers who have heard "claiming more" reduces taxes. On the current W-4, entering amounts in Step 3 without actual qualifying dependents causes under-withholding and a tax bill.
• Forgetting to sign: An unsigned W-4 is invalid. Some employers will return it to you; others may file under default withholding rules.
• Using an old form: If someone hands you a W-4 with an allowance line, it is an outdated form from before 2020. Request the current version from IRS.gov or your employer's HR system.

When to update your W-4

Your W-4 stays in effect until you submit a new one. Update it when:

• You get a second job (complete Step 2 on the new form).
• You get married or divorced.
• You have or adopt a child (you can now claim dependents in Step 3).
• You lose a dependent (remove from Step 3 to avoid under-withholding).
• You receive a large unexpected refund or a large tax bill - both signal your withholding is off.
• You start receiving significant non-wage income (freelance, investments).

You can submit a new W-4 to your employer at any time. The change typically takes effect within one or two pay periods.