Tax Withholding: How to Avoid Owing Money at Tax Time

What Is Tax Withholding?

Tax withholding is the amount of federal income tax your employer takes out of each paycheck and sends directly to the IRS on your behalf. The amount is based on the information you provide on your Form W-4, which you fill out when you start a new job.

If too little is withheld, you'll owe money when you file your return. If too much is withheld, you'll get a refund — but you've essentially given the IRS an interest-free loan.

How Is Withholding Calculated?

Your employer uses your W-4 information — filing status, number of jobs, dependents, and any extra withholding you request — along with IRS withholding tables to determine how much to take from each check. The calculation considers:

• Your expected annual income
• Your filing status (single, married, head of household)
• Dependents and tax credits you expect to claim
• Additional income from other jobs or sources
• Any extra amount you specifically request to be withheld

Common Withholding Mistakes

Not updating your W-4 after life changes. Getting married, having a child, or taking a second job all change your tax situation. If you don't update your W-4, your withholding could be way off.

Assuming your old W-4 is still accurate. Tax brackets, deduction amounts, and credit values change every year. A W-4 you filled out five years ago may not reflect your current situation.

Choosing too many allowances. The more allowances you claim, the less tax is withheld. Some people do this to maximize their take-home pay, but it often leads to a big tax bill in April.

Forgetting about side income. If you earn money from freelance work, investments, or a small business, nothing is withheld from that income automatically. You may need to make estimated tax payments to cover it.

How to Check If Your Withholding Is Right

The IRS recommends checking your withholding anytime you have a major life change or at least once midyear. The easiest way is to:

• Look at your most recent pay stub and find your year-to-date federal withholding
• Estimate your total expected income for the year
• Calculate your expected tax liability using current tax brackets, deductions, and credits
• Compare your projected withholding to your estimated tax liability

If your withholding is significantly less than your estimated tax, increase it by submitting a new W-4 to your employer requesting additional withholding.

How to Adjust Your Withholding

You can update your W-4 at any time — just request a new form from your HR department. Key adjustments:

• Increase withholding: Add an extra dollar amount in the "extra withholding" line if you want more taken out each paycheck
• Decrease withholding: Claim dependents or adjust your filing status if too much is being withheld
• Account for multiple jobs: The W-4 has a specific section for multiple jobs — use it to avoid under-withholding

Use Our Free Withholding Estimator

Our Withholding Estimator tool calculates your expected 2025 federal tax liability based on your income, filing status, and credits — then compares it to what you've had withheld so far. Enter your numbers to see whether you're on track for a refund or a bill, and how to adjust before it's too late.