If you find that too little federal income tax is being withheld from your paycheck, you risk owing money or facing penalties when you file your taxes. To fix this quickly, update your withholding by submitting a new Form W-4 to your employer. You can also make estimated tax payments if needed to cover any shortfall before year-end.
How can I tell if too little tax is being withheld from my paycheck?
You can tell if too little tax is being withheld by comparing the federal income tax amount on your pay stub to what you expect based on your income and filing status. Signs include your withholding being lower than last year’s tax liability or not increasing after a raise or second job. Also, if you owed money when filing last year despite regular withholding, your current withholding might be too low. Use the IRS withholding guidelines or the IRS Tax Withholding Estimator to estimate the correct amount.
What causes too little tax withholding and when does it usually happen?
Too little withholding often happens when your W-4 form doesn’t reflect changes in your life or job. Common causes are starting a second job, getting a raise, a change in filing status like marriage or divorce, or claiming too many allowances or deductions on your W-4. Sometimes people forget to update their W-4 after major events or fill it out incorrectly, including claiming exempt when they shouldn’t. These issues usually become apparent mid-year or when filing taxes if you review your paycheck withholding carefully.
How do I adjust my tax withholding to fix the problem?
To fix under-withholding, submit a new Form W-4 to your employer with updated details. Follow these steps:
- Use the IRS Tax Withholding Estimator online. It asks about your income, filing status, dependents, and other tax factors to estimate the correct withholding.
- Based on the estimator’s results, complete the new Form W-4, especially steps 3, 4, and 5, to account for dependents, additional income, and extra withholding.
- Submit the updated Form W-4 to your employer’s payroll or HR department promptly.
Your employer will adjust your withholding according to the new form, increasing the amount withheld if it was previously too low. This method helps avoid a large tax bill later and is easier than making a lump sum payment at tax time.
What if adjusting withholding mid-year isn’t enough?
If updating your withholding won’t cover your tax liability—especially late in the year—you can make estimated tax payments directly to the IRS. These payments reduce the chance of underpayment penalties and lower your tax bill at filing.
Make estimated payments using IRS Form 1040-ES or through the IRS Direct Pay website. While estimated payments are generally made quarterly, if you’re correcting withholding late, pay as soon as possible to cover the shortfall.
Keep track of how much tax you’ve already paid through both withholding and estimated payments to avoid overpaying. If unsure how much to pay, use the IRS withholding estimator or tax software to calculate the right amount.
How can I verify that my new withholding is correct?
After submitting a new W-4, check your next few paychecks to see if the federal income tax withheld has increased as expected. Compare the amounts withheld with the IRS estimator’s recommendations.
You can also rerun the IRS Tax Withholding Estimator mid-year to see if your withholding matches your projected tax liability. If it still doesn’t, you can update your W-4 again or make estimated payments.
Regularly reviewing your pay stubs against your tax estimates helps you stay on track and avoid surprises when filing.
How do I prevent too little tax withholding in the future?
Review your withholding whenever your life or financial situation changes—like getting a new job, a raise, marriage, or having children—and update your W-4 promptly.
Use the IRS Tax Withholding Estimator at least once a year or whenever your circumstances change significantly. Keep your pay stubs handy and compare the withholding amounts to your tax projections so you catch problems early.
By adjusting your withholding proactively, you can avoid unexpected tax bills or penalties.
Conclusion
Start by reviewing your recent pay stubs and comparing your withholding to your estimated tax liability. Submit a new Form W-4 to your employer using the IRS withholding estimator to guide your updates. If you still expect a shortfall, make estimated tax payments before the end of the year. Keep checking your withholding regularly to stay on track and prevent future issues.
Frequently Asked Questions
Can I submit a new W-4 anytime during the year?
Yes. You can submit a new Form W-4 to your employer at any time, and they are required to adjust your withholding based on the new form. This lets you correct under-withholding as soon as you notice it.
What happens if I don’t fix too little withholding?
If you don’t fix under-withholding, you could owe a large tax bill plus penalties and interest when you file your return. Adjusting your withholding or making estimated payments helps avoid surprises and extra costs.
How does claiming too many allowances on the W-4 affect withholding?
Claiming more allowances lowers the amount of tax withheld from each paycheck. If you claim more allowances than you’re entitled to based on your tax situation, your withholding will be too low, which can lead to owing taxes later.