5 Steps to Check Your Withholding and Avoid a Surprise Tax Bill
If you owed more than expected when you filed last April, your paycheck withholding may need a closer look. A large balance due can happen when your income changes, you or your spouse start a second job, or you receive income that does not have enough tax withheld.
The IRS Tax Withholding Estimator can help you check whether your federal income tax withholding is on track. Use these five steps to review your numbers, update your Form W-4 if needed, and check again later in the year.
1. Gather Your Tax and Income Information
Before you start, collect the details you’ll need to make a useful estimate:
- Your most recent paystub, and your spouse’s, if you expect to file jointly
- Your latest federal tax return
- Details about other income, such as freelance work, investments, Social Security, or unemployment
- Records of estimated tax payments
- Information about deductions, adjustments, and tax credits you expect to claim
The IRS Tax Withholding Estimator is intended for people with a job, pension, or annuity that has federal income tax withholding. The IRS says the estimate takes about 25 minutes. It does not ask for your name, Social Security number, address, or bank account information, and it does not save your responses.
The result is only as reliable as the information you enter. If you had a balance due, think about what changed last year and whether it is likely to happen again.
2. Check the Federal Tax Line on Your Paystub
Find your most recent paystub and locate the line showing federal income tax withheld. It may be labeled FIT, FITW, federal tax, or federal withholding.
Do not add state or local taxes, Social Security, Medicare, or other payroll deductions to this figure. These are separate items. If your paycheck shows additional federal withholding as a separate line, include that amount too.
The estimator may ask for both the amount withheld from your latest paycheck and the total withheld so far this year. These are different figures: use the current pay-period amount for the paycheck question and the year-to-date total for the year-to-date question. The IRS estimator FAQs explain common entry mistakes.
3. Run the IRS Tax Withholding Estimator
Enter your filing status, household income, withholding, and expected deductions or credits. If you file jointly, include your spouse’s income and withholding. Add other income and any estimated payments so the results reflect more than just your regular paycheck.
When the estimator gives you a projected refund or balance due, review the entries before acting. A large balance due may mean that your current withholding is too low, but the estimator is a planning tool, not a guarantee of what you will owe. Your actual tax can differ if your income or circumstances change, or if you entered estimates that turn out to be inaccurate.
The IRS may offer a pre-filled Form W-4 based on your results. Review the recommendation and make sure it fits your situation before you submit it to your employer.
4. Update Form W-4 With Your Employer
If the estimate indicates that you should change your withholding, use the recommended information to complete a new Form W-4. Submit it through your employer’s payroll or HR system, or follow your employer’s instructions for returning the form.
Form W-4 lets you account for items such as your filing status, multiple jobs, eligible dependents, other income, deductions, and any extra amount you want withheld from each paycheck. If you have more than one job, or you file jointly and your spouse works, make sure you account for all jobs when using the estimator. Follow its directions for which W-4 to update.
After submitting the form, check a later paystub to confirm that the change took effect. If you need help deciding how the estimator’s result applies to your household, a tax and accounting consultation can help you review the numbers before you make a change.
Need help reviewing withholding or estimated payments? Statewide Tax Services provides virtual tax and accounting consultations for individuals and businesses in Maple Valley, WA, and beyond. Schedule a consultation to review your situation and discuss practical next steps.
5. Recalculate Later in the Year
A W-4 update is not a “set it and forget it” decision. Check your withholding again after a significant change, such as a new job, a raise, a change in marital status or dependents, or new income from freelance work or investments.
The IRS recommends checking withholding each January and after major life or income changes. If you adjust withholding during the year, check again in late December so your setup is suitable for the next year. A later review can also help you see whether the amount coming out of each paycheck is tracking with your updated estimate.
Keep a copy of the estimator result and note when you submitted your W-4. Comparing the recommendation with a later paystub gives you a simple way to see whether the change was applied and whether another review may be useful.
Freelancers and Small Business Owners: Review Estimated Tax Too
If you earn income from freelance, gig, or business work, you may not have an employer withholding federal income tax from those payments. You may need to make quarterly estimated tax payments instead. The IRS explains the rules in its estimated tax guidance and Form 1040-ES.
In general, estimated payments may be required if you expect to owe at least $1,000 after withholding and refundable credits, and your withholding and credits are below certain limits. The rules depend on your income and tax situation. For 2026, the next regular estimated tax payment deadline is January 15, 2027. Review the IRS instructions for exceptions and current details.
If you also receive wages, increasing withholding from your paycheck may be one way to account for other income. Whether that approach or quarterly payments makes sense depends on your overall situation. A consultation can help you review your income, withholding, and payment plan together.
Make a Plan Before Filing Season
Checking your withholding now can give you time to adjust before filing your next return. Gather your paystub and latest return, run the IRS estimator, and submit a new Form W-4 if its results point to a change. Recheck your numbers later in the year, especially if your income or household situation shifts.
Statewide Tax Services is accepting clients for the 2025 tax year and provides virtual tax preparation, accounting support, and personalized consultations. E-filing pauses December 26 and is expected to resume in mid-to-late January. For now, book a consultation to review your withholding or estimated payments rather than trying to file.
Schedule a tax and accounting consultation: statewidetaxservices.com/calendar
Author: Penny, Statewide Tax Services