Withholding tax: What is it, and how can I check or change it?

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Your take-home pay is never the full amount you earned. Before the money even reaches your bank account, your employer automatically sends a portion of it to the IRS as prepaid income tax. It’s basically a pay-as-you-go system for your taxes.

Knowing how this system works is important. The amount withheld from each check directly impacts whether you’ll face a surprise tax bill or score a refund later. Reviewing and adjusting your withholding keeps things aligned with your financial situation, so you’re not overpaying or coming up short.

A withholding tax is the money your employer deducts from your paychecks each month to pay income taxes on your behalf. The amount of taxes your employer will withhold depends on your earnings and the information you provide on the IRS Form W-4.

The federal government operates on a pay-as-you-earn tax system. In other words, you’re required to pay taxes on your income as you earn it. Tax withholding ensures the government will have regular tax revenue throughout the year. And for your part, it helps you avoid a hefty tax bill when you file your income tax return the following spring.

Withholding taxes are required for most income, including regular pay, commissions, pensions, bonuses, reimbursements, gambling winnings, and other income. If you aren’t subject to tax withholding — if you’re self-employed, for example — you’re still required to pay taxes by certain due dates throughout the year in the form of estimated tax payments.

Your employer figures out how much tax to withhold using your yearly income and the details you put on your W-4. On that form, you include information, such as:

Your filing status
The number of dependents
Other income, including interest, dividends, and retirement income that doesn’t have taxes automatically withheld
Deductions you’re eligible for other than the standard deduction
Extra withholding taxes you want withheld each pay period

Once you complete your W-4, your employer uses withholding tables provided by the IRS, along with other adjustments on your W-4, to help calculate the correct withholding amount. The amount you’ll pay depends on the income tax rate that applies to your earnings.

If you live in a state that has income taxes, you’ll also likely have money withheld for your state income taxes. Because each state has its own tax code, the system for calculating tax withholdings and the way you can check or change your withholding will vary from state to state.

The simplest way to check your tax withholding is by using the IRS Tax Withholding Estimator. You’ll provide information about yourself, your income and withholding, your income adjustments, and your tax credits and deductions.

Based on the information you provide, the IRS calculator will determine your anticipated tax obligation. It will also project a tax refund or underpayment amount based on your expected tax withholding. It won’t be perfect, but it should be close to your real situation, so long as you enter complete and accurate information.

The IRS recommends checking your tax withholding occasionally to ensure you’re on track to pay the correct amount of taxes throughout the year. For example, you could check once per year, plus any time there are changes in tax laws that could affect your tax liability.

The IRS also recommends checking your tax withholding when there are changes to your finances or tax situation, including:

Lifestyle changes such as marriage, divorce, a new child, a home purchase, retirement, or bankruptcy
A significant change to your earned income (a new job, a significant pay increase, leaving the workforce, etc.)
Income that’s not subject to withholding, including interest, dividends, capital gains, self-employment income, and distributions from retirement accounts
Eligibility for certain itemized deductions, including major medical expenses, interest expenses, charitable gifts, dependent care, education costs, etc.

When you start a new job, you’ll have to complete a W-4 form to set your tax withholding for the year. Even if you’ve already completed one, you may decide to change your withholding based on life changes or discrepancies when you check your withholding. If you need to change your federal tax withholding, you can simply submit a new W-4 to your employer.

It’s essential to be as accurate as possible when completing the form to ensure you’re having enough tax withheld without overpaying significantly.

When you’re completing your W-4, the provided Multiple Jobs Worksheet and Deductions Worksheet can be helpful in reporting other factors that may increase or decrease your tax liability. And remember that if you’re concerned about underpaying — or you simply want a bigger refund at tax time — you can always use the “extra withholding” option to have a bit extra withheld from each paycheck.

You can claim exemption from federal tax withholding only if you owed zero federal income tax last year and expect to owe zero again this year.

This usually applies to students or retirees working part time, or seasonal workers who know for a fact they will earn less than the standard deduction ($15,750 for single filers in tax year 2025).

If that truly fits your situation, you can write “Exempt” on your W-4 for your employer.

But there’s a risk. If you end up making more than you expected — maybe from a bonus, a side gig, or an unexpected raise — and you didn’t have taxes withheld, you could get hit twice. You’d owe the full tax bill all at once by April 15, and if the amount is large enough, you may also face underpayment penalties.

Your withholding taxes don’t generally represent the total amount of income taxes you’ll owe for the year. When you file your tax return, you’ll use your total income, deductions, credits, and other factors to determine how much you owe in income taxes.

If the amount of withholding tax you’ve paid exceeds the amount of tax liability you owe, you’ll get a refund. On the other hand, if you haven’t paid enough withholding taxes, you’ll end up with a tax bill.

Some people prefer getting a refund, but either a large refund or a large tax bill could be a sign you need to change your tax withholding. For many taxpayers, the ideal scenario is to pay withholding taxes as closely as possible to their actual tax liability.