Second Job Withholding Calculator (OBBBA)
Enter your full-year picture below. The estimate shows the annual and per-paycheck gap between withholding and the OBBBA-adjusted tax — no signup.
The short answer: Kai — at the scenario numbers pre-loaded below, the OBBBA deduction is $3,080, worth about $678 in federal income tax at a 22% marginal rate ($26 per biweekly paycheck). Exact figures update live as you change the inputs.
⚠️ This calculator provides estimates for informational and educational purposes only. It is not tax advice. Results are based on the One Big Beautiful Bill Act (OBBBA) and IRS Schedule 1-A. Consult a qualified tax professional for your specific situation.
Withholding vs. What You Actually Owe
Two W-2s is the classic under-withholding setup — both jobs apply their own standard allowance — and OBBBA cuts both ways: the second job's OT premium is deductible, softening the bracket creep of stacked income. The fix is putting all adjustment on one W-4. The deduction stacking across jobs is per-taxpayer: combined OT premium, one $12,500 cap, regardless of how many employers paid it.
The full rules, caps and phase-outs for every deduction are in one table on the OBBBA rules page.
Worked Example
Kai's weekend job pays the overtime, but each employer withholds as if it were the only one.
- • Deductible amount: $3,080
- • Federal income tax savings: $678 (at the 22% marginal rate)
- • Per biweekly paycheck: $26
Adjust once on your W-4 and that gap shows up in your paychecks instead of waiting for refund season.
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Frequently Asked Questions
Do two jobs mean two overtime deductions?
No — the cap is per taxpayer, not per employer. Overtime premium from both W-2s sums and shares the single $12,500 (single) / $25,000 (MFJ) cap.
Does adjusting my W-4 change how much tax I owe?
No. Withholding only changes when you pay — per paycheck versus at refund time. Your actual tax is set by the OBBBA deductions themselves, which this calculator estimates.