Nanny Share Cost Calculator (2026)

How Nanny Share Costs Are Split

Families agree on one combined hourly rate for the nanny, then decide how to divide it. The calculator supports the four methods families actually use:

• Even split. Each family pays the same share. Simple, and fair when both families have one child and the same schedule.
• By number of children. Each family pays in proportion to its children. With three children, the family with two pays two-thirds. That can leave the larger family paying close to a solo rate, so some shares keep an even split and have the larger family cover any rate increase for the extra child instead.
• By hours of care used. For shares where schedules differ. Hours when two or more families' children are present are billed at the share rate and divided evenly among the families there; hours when only one family's children are present are billed to that family at the nanny's solo rate.
• Custom percentages. For anything else, such as an infant who needs more hands-on care or a family that also wants light housekeeping.

Here's an hours-based example: Family A needs 45 hours a week and Family B 35. The 35 overlapping hours cost each family $14.84 an hour, and Family A's 10 extra hours cost $22.26 an hour. Because the nanny works 45 hours, 5 of them are overtime, paid at an extra half of the nanny's blended regular rate (about $28.03). The calculator splits that premium in proportion to each family's straight-time pay, which comes to about $783 a week for Family A and $548 for Family B. Your contract can allocate overtime differently.

Worked Example: Two Families, One Nanny

Two families with one child each share a nanny for 40 hours a week. The nanny's solo rate is the U.S. average of $22.26 an hour, and the families pay $29.68 an hour combined, so each pays two-thirds of the solo rate. These are the calculator's default inputs.

Each family saves about $16,614 a year (33%), and the nanny earns $61,734, a third more than the $46,301 one family would pay. Two details are easy to miss. First, unemployment taxes are charged per employer, so the share pays $366 more in combined FUTA and state unemployment than a solo job would. That's small against the savings. Second, with three weeks of paid time off, each family uses 49 weeks of care. That makes the real cost $17.14 per hour of care used, not the $14.84 headline rate.

Setting the Share Rate

In a two-family share, each family typically pays about 60–75% of the nanny's solo rate. Care.com's rule of thumb is two-thirds. That means the nanny's combined rate is 20–50% higher than their rate for one family: the nanny cares for more children, but each family still pays well under a solo salary. An infant or a child with extra needs can justify a higher rate or a larger portion for that family. To see typical local solo rates, check nanny share costs by city and the nanny salary by state guide. Then agree on the combined rate before you discuss the split, so the nanny's pay doesn't get negotiated down family by family.

Taxes and Payroll in a Nanny Share

Both families pay the nanny and direct the nanny's work, so each family is generally a separate household employer for the wages it pays. Each family needs its own EIN and state unemployment account, runs its own payroll, files its own Schedule H with its Form 1040, and gives the nanny a W-2 by January 31. The nanny gets one W-2 from each family. The 2026 rules from IRS Publication 926 apply to each family separately:

• Social Security and Medicare: owed once a family pays the nanny $3,000 or more in cash wages in 2026. The family pays 7.65% and withholds another 7.65% from the nanny's pay.
• Federal unemployment (FUTA): owed once a family pays $1,000 or more in any calendar quarter. The rate is 6.0% of the first $7,000 per employee, reduced to 0.6% by the state credit. California employers had a 1.2% credit reduction for 2025, which raises their FUTA cost.
• State unemployment: each family registers with the state and pays its assigned rate on its own wage base. Some states add paid family leave, disability insurance or workers' comp requirements for household employers.
• Mileage: reimbursing the actual miles the nanny drives for the share at or below the IRS rate is generally not taxable wages.

The nanny tax calculator shows withholding and take-home pay from one family's wages. The nanny taxes & payroll guide covers deadlines and payroll services. Paying on the books also lets each family use a Dependent Care FSA or the child care tax credit on its own share.

What a Nanny Share Contract Should Cover

A share needs everything in a standard nanny contract, plus terms between the two families. Settle these points before the first day:

• Rate and split: the combined rate, each family's portion, and how both change if a new baby joins or a child starts preschool.
• Location: one host home or rotating homes, who stocks food and supplies, and any host-family credit for utilities and wear.
• Guaranteed pay and absences: whether a family keeps paying when its child is sick or away, and what happens when the nanny is out.
• Overtime and late pickups: who pays when one family runs late and pushes the nanny past 40 hours.
• Payroll: confirm both families are registered employers. If only one family reports wages, the nanny's unemployment record is incomplete and the other family risks penalties.
• Exit terms: a notice period (two to four weeks, for example) and what happens to the nanny's job if one family leaves.

Still searching for the right person? Start with how to hire a nanny. Both families should take part in the interviews.

Frequently Asked Questions