Is the Form W-4 you filled out when you started your job still accurate today? If anything changed in your life during 2026 — a new job or a second job, marriage or divorce, a new baby, or a big change in income — the tax being withheld from your paycheck may no longer be right. The IRS officially urged every worker this year to do a "paycheck checkup," and right now — before the year ends, while a few paychecks remain in 2026 — is the time to correct it instead of waiting for a surprise at filing time.
Why this checkup matters
Federal income tax in the United States is pay-as-you-go: your employer withholds an amount from each paycheck based on your earnings and the information on the Form W-4 you gave them. If too little is withheld, you can face a balance due when you file, possibly with an underpayment penalty. If too much is withheld, you may get a large refund that feels good — but it means your money was tied up all year instead of being available for bills and savings.
The free checkup, step by step (about 15–25 minutes):
- Gather your most recent pay stub from every job you hold — and your spouse's if you file jointly. Having your last tax return nearby helps too.
- Go only to the official IRS tool: irs.gov/W4App (the Tax Withholding Estimator). It is completely free.
- Enter your income, withholding so far, and expected deductions and credits. Important: the tool does NOT ask for your name, Social Security number, address, or bank account — never enter those on any look-alike site.
- The tool shows your projected result: on track, a refund, or a balance due.
- If an adjustment is needed, use the estimator's results to complete a new Form W-4 and give it to your employer or payroll department. Do NOT send Form W-4 to the IRS — it stays with your employer only.
- After one or two paychecks, check your pay stub to confirm the new withholding actually took effect.
What this checkup does not cover:
- Form W-4 and the estimator affect federal income tax only. They do not change state or local tax, or Social Security and Medicare (FICA) withholding, which are fixed percentages.
- If you have no job, pension, or annuity with withholding, the estimator cannot help you. Self-employed workers and others with income that has no withholding instead make quarterly estimated tax payments with Form 1040-ES; see IRS Publication 505 for details.
Final tip: repeat this checkup early each new year, and after any major job, family, or income change — exactly what the IRS recommended in its official reminder issued September 4, 2026 (IR-2026-105).
Sources:
- IRS Newsroom — IR-2026-105 (September 4, 2026): https://www.irs.gov/newsroom/irs-reminder-national-payroll-week-is-time-for-a-paycheck-checkup
- IRS Taxpayer Advocate Service — withholding adjustment tip (2026): https://www.taxpayeradvocate.irs.gov/news/tax-tips/tas-tax-tip-adjust-your-withholding-to-ensure-theres-no-surprises-on-tax-day/2026/04/
- IRS — Tax Withholding Estimator FAQs: https://www.irs.gov/individuals/tax-withholding-estimator-faqs
(General educational information, not personal tax advice; consult a tax professional about your own situation.)
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