W-4 Withholding Checkup for 2027
By Cedar & Ledger
January is a good time to check how much tax your job takes out. A quick W-4 checkup can stop a surprise bill next spring, or a huge refund that was really your money all year.
This is general information, not tax advice. Check the IRS Tax Withholding Estimator on IRS.gov or ask a tax professional. Example numbers are made up.
Quick checklist
- ☐ Grab your most recent pay stub
- ☐ Look at last year's return: refund or amount owed
- ☐ Note any life changes (new job, marriage, baby, side income)
- ☐ Run the IRS Tax Withholding Estimator
- ☐ Give your employer a new W-4 if it suggests one
Step 1: When to check
Check at the start of the year, after a big life change, when you start a second job or side hustle, and if last year's refund or bill was larger than you'd like.
Step 2: Gather what you need
You'll want a recent pay stub for each job, last year's return, and a rough idea of other income like side hustle profit or interest.
Step 3: Use the estimator
The IRS Tax Withholding Estimator walks you through your income and credits and suggests W-4 entries. It's free and doesn't ask for your name or Social Security number.
Step 4: Covering side income
If you have side income, you can ask your employer to withhold a bit more (the "extra withholding" line on the W-4) instead of, or as well as, making quarterly payments.
| (Made-up example) | Amount |
|---|---|
| Expected tax on side profit for the year | $1,300 |
| Paychecks left this year | 26 |
| Extra withholding per paycheck | $50 |
Tools that help
The Paycheck Budget spreadsheet shows what each paycheck can cover after any withholding change, so you can plan around it. Our quarterly estimated taxes guide covers the other option.
Common questions
Is a big refund bad? Not bad, but it means you overpaid during the year. Some people like it as forced savings.
Do I have to file a new W-4 each year? No. Your old one stays in place until you change it.
Where do I send it? To your employer, usually through payroll or HR, not to the IRS.
Related template: Paycheck Budget Planner. Also see: 2027 Budget Planner
See all Cedar & Ledger templates
Try the free side hustle tax set-aside calculator →
Frequently asked questions
What does this guide cover?
Check your paycheck withholding in January with the IRS estimator and cover side income. Example numbers.
What are the steps?
1) When to check; 2) Gather what you need; 3) Use the estimator; 4) Covering side income.
Do I need a template to do this?
No. A notebook or a sheet you build yourself works fine. Cedar & Ledger also sells spreadsheet templates (I'd earn from a purchase); see the template box at the top of this page.
Is this financial advice?
No. It's general information with example numbers only, not financial, tax, legal or medical advice. Use your own numbers and check anything important with a qualified professional or the official source.