An au pair costs a host family $27,000–$30,000 a year all-in; a nanny share costs each family roughly $40,000–$50,000 a year in the big metros. Those are the two serious answers to the same question — how do you get dedicated, in-home care without paying $70,000+ for a solo nanny — and almost nobody compares them directly, because one lives in the cultural-exchange world and the other in the nanny world. They deserve the head-to-head.
To be clear about what this page is not: if you are weighing an au pair against a solo nanny, that is our au pair vs nanny guide. This one assumes you have already ruled out paying full freight and are choosing between the two budget paths — the J-1 exchange visitor living in your guest room, or the experienced professional splitting her week between your child and another family's. The mechanics of each live in our nanny share guide and au pair cost guide; this page is the decision.
An au pair runs $27,000–$30,000 a year ($195.75/week stipend + $9,000–$12,500 program fee + room and board) and works up to 45 hours a week, 10 per day — about $12–$13 per used hour at full schedule. A nanny share runs each family $17–$22 an hour plus employer taxes ($40,000–$50,000 a year at 45 hours) but brings a career professional. The dividing lines: an au pair needs a private bedroom and cannot be the sole caregiver for a baby under 3 months (under 2 requires 200 documented hours of infant experience); a share needs no bedroom, works for infants, but depends on a partner family staying in. Au pairs turn over by design at 12–24 months; shared nannies, earning roughly 30% above solo rates (a 1.3x–1.4x combined rate), tend to stay.
The Fast Comparison Table
| Factor | Au pair | Nanny share |
|---|---|---|
| Annual cost (per family) | $27,000–$30,000 all-in | $40,000–$50,000 at 45 hrs/week in major metros |
| Effective hourly cost | ~$12–$13 at a full 45-hour schedule | $19–$25 loaded (wage + employer taxes) |
| Hours | Hard caps: 45/week, 10/day | Whatever you contract — overtime at 1.5x past 40 |
| Infants | Never sole care under 3 months; under 2 requires Infant Qualified (200 hrs) | Yes — shares routinely start at the end of parental leave |
| Caregiver profile | 18–26, cultural exchange, screened but early-career | Experienced professional, often 5–10+ years |
| Whose kids | Yours only | Yours plus one other family's |
| Space required | Private bedroom, room and board | None beyond hosting duty (rotating or fixed) |
| Term / stability | 12 months, extendable to 24 max; rematch risk | Open-ended; partner-family exit is the risk |
| Payroll | Stipend; no FICA or FUTA withholding | Full household payroll: W-2, FICA, state accounts |
The Cost Math, Properly Done
The au pair number is genuinely lower, and the gap is bigger than it looks per hour. The all-in $27,000–$30,000 — weekly stipend of $195.75 ($195.75 × 52 = $10,179), program fee of $9,000–$12,500, the $500 education allowance, car and food costs — covers up to 45 hours a week. Use the full schedule and you are near $12–$13 an hour; no share, and no daycare in a major metro, touches that.
But the honest ledger has two more lines. First, the bedroom: an au pair requires a private room, and in the cities where this comparison is live — San Francisco, New York, Boston, DC — a spare bedroom is precisely the thing many families do not have. The share's entire premise is that it works in a two-bedroom life. Second, utilization: the au pair's $12/hour assumes you actually need 45 spread hours. A family that needs 50 guaranteed hours of Monday–Friday coverage cannot get them from an au pair at any price — the caps are federal regulation, not negotiation — while a share simply prices the extra five hours at overtime.
The share's $40,000–$50,000 per family, meanwhile, buys a different product: a professional at the top of her market — shares pay nannies roughly 30% above solo rates (a 1.3x–1.4x combined rate), which is why experienced candidates seek them out — plus a built-in playmate for your child. Per-family split math for your metro is in the pillar guide; each family also brings its own $7,500 Dependent Care FSA, which softens both options about equally.
Scheduling: Hard Caps vs. Negotiated Hours
The au pair schedule is flexible inside its box and immovable at the edges: any pattern you like up to 10 hours a day and 45 a week, plus mandatory time off — a day and a half each week, one full weekend a month, two weeks of paid vacation. Evening and weekend hours are available in a way no share offers, which is why au pairs suit rotating-shift households (physicians, most famously). But the box is the box: no 11-hour Tuesday, ever, and overnight newborn duty does not fit inside it.
A share flips it: the hours are whatever two families negotiate and guarantee — 45, 50, occasionally more, priced with overtime built in — but they must be hours both families can live with. The two-family negotiation is the share's real scheduling tax: every schedule change, sick day, and vacation week needs a counterparty's agreement. Families with matched, stable, weekday-anchored jobs barely feel it; families with volatile calendars feel nothing else.
The logistics behind those hours differ too. An au pair adds a person to your household — meals, a car to insure and share, a housemate's rhythms — but zero daily transport, since care happens where she lives. A share adds a commute-scale constraint instead: the families need to be at stroller distance (a mile is the practical ceiling), someone hosts, and drop-off friction is a daily line item. City families consistently underrate the first and overrate the second — the housemate adjustment is bigger than the drop-off one.
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If you are comparing for a baby, the regulation may decide for you. An au pair can never be the sole caregiver for an infant under 3 months — a parent or responsible adult must be present — and caring for any child under 2 requires an Infant Qualified au pair with 200 documented hours of infant-care experience. Those au pairs exist, but the pool shrinks, and 200 hours is still a fraction of what a professional brings.
Shares were practically invented for this window. Two families with babies a few months apart, one experienced infant nanny — often with newborn-care-specialist chops — starting the week parental leave ends. If your child is under one, the share is usually the stronger answer on merit, not just eligibility; the calculus reopens at toddler age, when the au pair pool fully qualifies and the energy match starts to favor a 22-year-old.
Stability and the Two Exit Doors
Both options carry a structural fragility; they are just different ones. The au pair's is the calendar: matches run 12 months, extendable to a maximum of 24, so turnover is designed in — you will re-match, re-train, and re-bond on a schedule. Mid-year rematch also happens when a match sours; sponsors run a defined process for it, but it can leave you uncovered for weeks. The share's fragility is the other family: a job loss, a move, a second baby, and your childcare halves overnight. Well-run shares price this in with 60-day exit notice and a solo-rate bridge clause — the share legal guide covers the language — and the nanny herself is the stable element, since she is earning more than any solo family would pay her.
Administratively, the au pair is the lighter lift by far: a stipend, no FICA or FUTA, sponsor-handled visa and insurance scaffolding. The share means running a real household payroll — W-2, state accounts, workers' comp where required — twice over across the two families; our nanny tax guide maps it.
Which One Should You Pick?
Choose the au pair when: your children are 2+ (or you can source Infant Qualified with real depth), you have the spare bedroom, your hours are moderate but oddly shaped — evenings, weekends, rotating shifts — and your family genuinely wants the cultural-exchange relationship, annual goodbyes included. At $27,000–$30,000 for up to 45 flexible hours, nothing else is close on price.
Choose the nanny share when: you have an infant, no spare room, a compatible family within a mile, and weekday hours two households can agree on — and you want a professional's experience rather than an exchange visitor's enthusiasm. You will pay $13,000–$20,000 a year more than the au pair path and still save $20,000+ against a solo hire.
One triangulation point before you commit: both options should also beat your local daycare math to earn the extra logistics. In the metros where shares thrive, an infant room runs $1,700–$3,200 a month depending on the city — usually below both paths on price, and behind both on hours, flexibility, and sick-day resilience. Our au pair vs daycare comparison runs that side of the triangle.
And if the honest answer is "neither cleanly" — volatile hours, an infant, and no candidate partner family — price a solo nanny before contorting your life around either structure. Services like Beverly coordinate all three searches at once, which is the fastest way to find out what your actual market offers rather than what the averages promise.
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