Hiring a full-time nanny means bringing someone into your home 40+ hours per week—which is why understanding legal requirements by state matters before you offer the job. Employment laws, tax obligations, and background check standards vary significantly across the U.S., and getting them wrong can expose you to costly penalties and liability. This guide walks you through what you actually need to know and do.
Federal Requirements That Apply Everywhere
The IRS classifies full-time nannies as household employees, which triggers federal payroll obligations regardless of where you live. You must withhold and pay Social Security and Medicare taxes (FICA), plus file Form W-2 at year-end if your nanny earned $2,400 or more in 2024 (amounts adjust annually). Federal tax withholding is also required unless your employee explicitly claims exempt status—and you're responsible for the employer portion of FICA taxes, typically around 7.65% of wages.
You'll need an Employer Identification Number (EIN) from the IRS even if you're a sole household. Many families use a nanny payroll service like Care.com, Bambino, or SurePayroll to handle these calculations and filings; expect to pay $100–$200 monthly for this service, which is often worth the compliance peace of mind.
State-by-State Variations
Minimum Wage and Overtime Rules
California, New York, and Massachusetts have notably higher minimum wages for household employees than the federal baseline of $7.25/hour. California requires at least $16.05/hour (2024), while New York mandates $15/hour, and Massachusetts $15/hour. More importantly, many states now require overtime pay after 40 or 45 hours per week; California requires time-and-a-half after 8 hours in a day or 40 hours in a week, making full-time nanny costs substantially higher. Check your state's Department of Labor website or use the U.S. Department of Labor's household employment guide to confirm current rates.
Workers' Compensation Insurance
About 30 states require household employers to carry workers' compensation insurance for full-time nannies. States like Illinois, New Jersey, and Connecticut mandate it; others like Florida and Texas do not. Policies typically cost $600–$1,500 annually for a single household employee, depending on your state and the nanny's wage. Not carrying required insurance can result in fines of $500–$10,000 or more if your nanny is injured on the job.
Background Checks and Screening
While no federal law mandates nanny background checks, many states encourage or require them through licensing programs. Some states (New York, California) have streamlined fingerprint and criminal history check processes specifically for household employees. Even where not required, a standard background check—criminal history, sex offender registry, driving record—typically costs $30–$75 and is a realistic safety step most families take.
Tax Withholding and Reporting
Your responsibilities include:
- Withholding federal income tax based on a W-4 your employee provides
- Calculating and paying FICA taxes (Social Security and Medicare)
- Reporting unemployment tax if your nanny's annual wages exceed your state's threshold (often $1,000–$1,500)
- Filing Form W-2 by January 31st for wages paid in the prior year
- Maintaining payroll records showing hours, wages, and deductions for at least three years
Many families underestimate how much this adds to the actual cost of hiring a full-time nanny. If you're paying $18/hour for 40 hours per week ($37,440 annually), factor in another $2,800–$3,200 in employer taxes and insurance.
Setting Up Legally: Step-by-Step
- Verify your state's wage and overtime rules via your state's labor department website
- Obtain an EIN from the IRS (free; takes 15 minutes online)
- Confirm workers' compensation requirements with your state or a household employment insurance broker
- Set up payroll processing through a nanny payroll service or your accountant
- Request a completed W-4 from your new employee
- Arrange background checks if desired (not required federally but strongly recommended)
- Draft an employment agreement outlining hours, wages, benefits, and house rules
If navigating this independently feels overwhelming, platforms like Mercoly help you compare and find trusted full-time nanny providers in one place, many of whom understand employment compliance.
Frequently Asked Questions
Q: Do I need an employment contract with a full-time nanny? While not legally required in most states, a written employment agreement protects both you and your employee by clarifying expectations around wages, hours, vacation, and termination notice—it's a best practice that prevents costly misunderstandings.
Q: Can I pay a full-time nanny in cash to avoid taxes? No; doing so is illegal wage evasion that can result in IRS penalties, interest, and potential criminal charges if the IRS audits you; the cost of proper payroll processing ($100–$200/month) is far cheaper than the legal consequences.
Q: What's the typical hourly rate for a full-time nanny in 2024? Rates range from $16–$25/hour depending on your state, experience level, certifications (CPR, early childhood education), and whether the role includes light housekeeping; coastal urban areas and states with high minimum wages push rates toward $20–$28/hour.
Ready to hire legally and confidently? Start by verifying your state's requirements today, then connect with vetted nanny providers who understand employment compliance.