How the second income reality check works
Updated September 2026
What “true take-home” actually means
True take-home is the money a second income actually adds to your household after subtracting everything that income costs you to earn: taxes at your marginal rate, childcare, commuting, the day-to-day cost of working, benefits you'd give up, and savings you'd lose by not staying home. For many families the number lands thousands of dollars below the salary on the offer letter. Sometimes it lands below zero.
The five costs that eat a second paycheck
1. Taxes at your marginal rate. A second income is taxed on your last dollar, not your average dollar. A household already earning $80,000 doesn't pay 12% on a new $60,000 salary — those new dollars land in the 22% federal bracket, plus state tax, plus 7.65% FICA. On $60,000 that's roughly $13,200 federal, $3,000 state and $4,590 FICA before a single other cost is subtracted.
2. Childcare. The national average is $13,128 per child per year, up 29% since 2020 (Child Care Aware of America, 2024). Care.com's 2025 survey found parents spending 22% of household income on childcare. Two kids in daycare can erase $25,000 or more of a salary on this line alone.
3. Commuting. At the IRS 2026 rate of 72.5¢ per mile, a 30-mile round trip three days a week costs about $3,393 a year in vehicle costs — before parking.
4. The cost of working. Lunches, coffee, work clothes, the convenience spending that appears when nobody is home to cook. One hundred dollars a week is $5,200 a year, and most working parents underestimate it.
5. Lost benefits and lost stay-home savings. A 401(k) match you walk away from is a pay cut by another name — $4,200 a year at a 7% match on a $60,000 salary. And staying home saves real money: cooking instead of takeout, running one car instead of two.
A worked example: the $60,000 job that pays −$5,623
Take a $60,000 offer, full-time, 52 weeks. Taxes at 22% federal, 5% state, plus FICA: $20,790. Childcare for two: $28,000. A three-day commute at 30 miles round trip: $3,393. About $108 a week in work costs: $5,640. A lost 401(k) match: $4,200. Stay-home savings given up: $3,600.
Add it up: $60,000 − $20,790 − $41,233 in work costs − $3,600 in lost savings = −$5,623 per year. The true hourly rate is −$2.70. You would need a salary of $68,604 just to break even — to add exactly zero. Those are the calculator's default numbers above; change any of them and watch the verdict move.
How to read your result
The verdict comes in three flavors. Not worth it means the income costs you money after everything — the number is negative. Marginal means the total is positive but your true hourly rate is less than half the headline rate; you're working full-time hours for part-time pay. Worth it means the numbers genuinely work.
The break-even salary deserves attention even when the verdict is positive: it's the salary at which the job would add exactly $0. If your offer sits just above break-even, small changes — a rent increase at daycare, an extra commute day — can flip the answer.
What this calculator doesn't do
It answers one scenario for one year. It doesn't model childcare costs falling as children reach school age, compare two offers side by side, or produce a summary you can print and discuss. The full Second Income Reality Check workbook does all three, on the same validated math. And none of this is tax advice — the rates are your assumptions, and the result is only as good as the numbers you type in.
Sources
- IRS, Topic No. 751: Social Security and Medicare withholding rates — 7.65% employee FICA rate.
- Congressional Research Service, IRS Standard Mileage Rates — 2026 rate $0.725/mile (Notice 2026-10).
- Care.com, 2025 Cost of Care Report — parents spend 22% of household income on childcare; 57% paid at least $9,600 in 2024.
- Child Care Aware of America, Child Care in America: 2024 Price & Supply — national average $13,128/year, up 29% since 2020.
Educational information only — not tax, legal or financial advice. Tax rates entered here are your own assumptions. Consider a qualified professional for decisions about your specific situation.