Nanny Cost Calculator

The hourly rate is the smallest part of what a nanny actually costs

Families comparing a nanny’s hourly rate against daycare’s weekly tuition often make an apples-to-oranges comparison, because the hourly rate alone leaves out real costs that daycare pricing already bundles in: overtime for hours beyond 40 in a week, the household’s own employer-side payroll tax obligations, and backup care for the days a nanny is out sick or on vacation and daycare’s built-in staff redundancy isn’t there to cover the gap. This calculator builds the full annual figure so a nanny-versus-daycare comparison is actually comparing equivalent numbers.

Overtime isn’t optional, and it’s a common compliance gap

Most nannies are non-exempt employees under the federal Fair Labor Standards Act, meaning hours worked beyond 40 in a single workweek generally must be paid at 1.5 times the regular rate — this applies even though the arrangement is informal and happens inside a private home rather than a business. It’s a genuinely common area where well-intentioned families fall out of compliance without realizing it, often because “salary” gets discussed informally without translating it into an effective hourly rate and checking the overtime math. This calculator applies standard 1.5x overtime automatically to hours beyond 40 so the number reflects what’s actually owed, not just a flat weekly estimate.

The “nanny tax”: what it is, and what this calculator does and doesn’t do

Once a household pays a nanny or other household employee above a federal wage threshold in a year, the household itself becomes an employer for tax purposes — responsible for its own share of Social Security and Medicare tax, and often federal and state unemployment tax, with real filing obligations (commonly Schedule H with the household’s federal tax return, plus a W-2 for the employee). This calculator’s employer-tax line is deliberately a rate you supply, not a hardcoded figure — get the actual current combined rate from a household payroll service or accountant, since it depends on federal rates, your state’s unemployment tax rules, and whether you’re above or below relevant wage thresholds. Treat this calculator’s employer-tax line as a budgeting placeholder, not a compliance calculation.

Why most families with a nanny use a household payroll service

Given the compliance surface — overtime rules, employer tax withholding and matching, quarterly or annual filings, generating a proper W-2 at year end — most families who employ a nanny long-term use a dedicated household payroll service rather than handling it manually. These services typically cost a modest monthly fee and substantially reduce the risk of getting the household-employer obligations wrong, which carries real financial and legal risk if discovered later, whether through an audit, an unemployment claim, or the nanny’s own tax filing surfacing a mismatch. This calculator helps you budget the all-in cost before hiring; it isn’t a substitute for that service once you actually have an employee.

Backup care: the cost daycare quietly bundles in that a nanny arrangement doesn’t

A daycare center has staff redundancy built in — if one teacher is out sick, another covers the room, and your child’s care continues uninterrupted without any action on your part. A nanny arrangement doesn’t have that built-in redundancy: when your nanny is out sick or on vacation, you need a backup plan, whether that’s a backup care service, a family member, or a one-off babysitter, and that has its own real cost that a bare hourly-rate comparison against daycare leaves out entirely. Budgeting a realistic number of backup care days per year, as this calculator does, closes that gap. See the babysitting cost calculator for occasional or backup childcare specifically, and the daycare cost calculator for a full, comparable center-based cost projection.