You have organized your records—great! Now it’s time to make sure the IRS isn’t taking too much or too little out of each paycheck.
Most people set their W-4 once and never touch it again. But life changes—marriage, kids, raises, side income, new deductions—and withholding should change with them. If it doesn’t, you either:
- Over-withholding giving the IRS a year-long, interest-free loan, or
- Under-withholding results in owing a surprise tax bill—and possibly penalties—next April.
March is the best time to check this for 2026, so adjustments flow smoothly for the rest of 2025.
Your 5-Minute 2026 W-4 Checkup
- Review last year’s numbers
Look at your 2025 tax return for:
- Total Tax
- Total withholding
- Whether you received a refund or owed
- Use the IRS Withholding Estimator
Go to irs.gov/W4app. You’ll need:
- Your most recent pay stub
- Estimate of 2026 income (including bonuses, raises, and side gigs)
- Non-wage income (Interest, dividends, retirement distributions)
- Expected deductions and credits for 2026
The tool will tell you exactly how to update your W-4
- Adjust your W-4 before April 15
Submit changes early to keep the rest of 2026 on track. Pay attention to:
- Dependents (Line 3)
- Other Income (Line 4a)
- Itemized Deductions (Line 4b)
- Extra withholding per paycheck (Line 4c)
Pro tip: If you freelance or have big investment income, adding a small amount of extra withholding per paycheck can reduce or eliminate the need for quarterly estimated payments.
Special situations that require an “update your W-4”
- Marriage or divorce
- Birth or adoption
- Started or stopped a side gig
- Paying off or refinancing your mortgage
- Turned 65 (higher extra standard deduction)
- Started taking Social Security or RMDs
If any of these apply, rerun the estimator.
Your Target: Keep it within $1,000
Aiming for a refund or balance due of less than $1,000 is usually ideal:
- A refund under $1,000 means more money remains in your pocket during the year.
- Owing under $1,000 generally avoids underpayment penalties
Take 15 minutes this week, run the estimator, and give yourself a raise in every 2026 paycheck. You’ve earned it!
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