Mid-Year Withholding Checkup
Your last paycheck of the year shouldn’t be the first time you check your withholding. Any income change, job change, or life event that happens mid-year throws off the withholding you set back in January — and it doesn’t correct itself just because your circumstances did.
Why a Mid-Year Change Throws Off January’s Numbers
When you filled out your W-4, it was based on your situation at that time — your expected income, filing status, and any other income you knew about. A raise, a bonus, a new job, a marriage, a new dependent, a spouse starting or leaving work, or a chunk of freelance income arriving mid-year all change what you’ll actually owe for the year. Your withholding, though, keeps running at the rate calculated back in January until someone changes it — which means the gap between what’s being withheld and what you’ll actually owe can grow for months before anyone notices.
The Quick Way to Check If You’re on Track
You don’t need a full tax projection to get a useful read. Pull your most recent pay stub and find your year-to-date federal withholding, then project it forward:
| (YTD Withholding ÷ Pay Periods Elapsed) × Total Pay Periods for the Year, compared against your Projected Annual Tax Liability |
If that projected full-year withholding is roughly in line with what you expect to owe — using last year’s return as a starting point, adjusted for anything that’s changed — you’re on track. If there’s a real gap in either direction, it’s worth digging further before assuming everything will sort itself out by December.
When to Actually Submit a New W-4 vs. Just Monitor
A small gap doesn’t necessarily call for a new W-4. Sometimes the simplest move is to keep an eye on it, or cover the difference with an estimated payment if you’re already making one for other income. A new W-4 makes more sense when the gap is growing, when the change is permanent — a new baseline salary, a lasting change in filing status — or when you’d rather have it corrected automatically than track it manually every pay period.
Timing matters more than people expect here. Catching a real gap in July still leaves five or six paychecks to spread the adjustment across. Catching it in December leaves few or none — which is exactly how a manageable correction turns into an unpleasant surprise on your return.
| Not Sure If Your Withholding Is Still on Track? |
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| If you’ve had any income change, job change, or life event this year and haven’t checked your withholding since January, we’ll run the comparison for you and tell you whether it’s worth adjusting — and if so, help you get the new W-4 right. Reach out to schedule a mid-year withholding checkup. |
Next in this series: “Three Different 1099s, One Income — Here’s How They Fit Together” — once your withholding is on track, the next place gig and side-business income gets tangled is at tax form reconciliation. Read Blog Post 26.38.