Nanny Share Legal Guide: Contracts, Liability & Tax Implications

A nanny share — where two families share one nanny and split costs — can be one of the smartest childcare arrangements available. You get professional, individualized care at a lower per-family cost than hiring a nanny solo, and your nanny earns more than they would working for a single family. But the legal and tax structure of a nanny share is more complex than a standard nanny arrangement.

This guide covers the essential legal, contractual, and tax considerations for setting up a nanny share that protects both families and the nanny. For an overview of different care arrangements, see our guide to types of nannies.

How Nanny Share Employment Works

The most common structure is for both families to be co-employers. Each family has their own EIN and pays the nanny directly for the hours their children are present. Alternatively, one family serves as the primary employer and the second family reimburses their share.

Cost Structure Example

Each family saves roughly $7/hour compared to hiring solo, while the nanny earns $11/hour more. This is a win for everyone, which is why nanny shares are increasingly popular in high-cost cities. Factor this into your overall childcare budget planning.

Tax Obligations in a Nanny Share

Both families in a nanny share have separate nanny tax obligations:

• Each family needs their own federal EIN
• Each family registers separately for state unemployment insurance
• Each family withholds and pays their share of FICA taxes
• Each family is responsible for FUTA on the wages they pay
• The nanny receives either one W-2 (if one family handles all payroll) or two W-2s (if each family pays separately)

The cleanest approach is usually for one family to handle all payroll through a payroll service, with the second family reimbursing their share of wages and taxes each pay period. This reduces the nanny's administrative burden and keeps records consistent.

The Family Agreement

Beyond the employment contract with the nanny, the two families need their own written agreement covering:

1. Cost split: How wages, taxes, benefits, bonuses, and reimbursements are divided (typically 50/50 or proportional to hours)
2. Schedule: Days and hours each family's children are present, and how schedule conflicts are resolved
3. Location: Where care takes place (alternating homes, one primary home), and any compensation for the host family
4. Sick child policy: What happens when one family's child is ill (the well children continue care; the sick child stays home)
5. Vacation coordination: How family vacations affect scheduling and payment
6. Exit clause: How much notice is required if one family wants to leave the share (typically 30 to 60 days), and who retains the nanny
7. Dispute resolution: A process for handling disagreements between families
8. Insurance and liability: Who carries homeowners or renters insurance that covers the care location, and how liability for injuries is handled

Liability Considerations

When children from two families are cared for together, liability questions become more complex. Consider these protections:

• Homeowners/renters insurance: Verify your policy covers household employees and children of non-residents on your property
• Umbrella insurance: An umbrella policy provides additional liability coverage above your homeowners limits
• Workers' compensation: Required in many states and should cover the nanny regardless of whose home they are working in

The families that succeed with nanny shares are the ones who invest time upfront in thorough written agreements. Every scenario you address in advance is a potential conflict you avoid later.