{
  "slug": "nanny-share-split",
  "title": "Nanny Share Split Calculator",
  "heading": "Nanny Share Cost-Split Calculator",
  "category": "financial",
  "url": "https://www.revenuelab.fyi/toolbox/nanny-share-split",
  "summary": "Fair per-family cost when two households share one nanny.",
  "description": "Nanny shares cut cost per family versus solo care, but splitting the bill fairly gets messy once families have different kid counts, different hours, or one family uses a spare bedroom for care. This calculator splits total weekly cost using a base rate per family plus a per-child add-on, which is the most common real-world structure — it avoids the trap of splitting straight down the middle when one family has one child and the other has three, or when hours differ significantly between families.",
  "formula": "Per-family base = total wage × base share ÷ number of families; per-child add-on = remaining pool ÷ total children; family total = base + (add-on × that family's kids), scaled by hours share if hours differ.",
  "dateModified": "2026-09-30",
  "run_url": "https://www.revenuelab.fyi/api/public/calc?tool=nanny-share-split",
  "inputs": [
    {
      "id": "totalWage",
      "label": "Nanny's total weekly wage",
      "kind": "number",
      "hint": null,
      "default": 1000,
      "unit": "$",
      "min": 0,
      "max": null
    },
    {
      "id": "families",
      "label": "Number of families",
      "kind": "number",
      "hint": null,
      "default": 2,
      "unit": null,
      "min": 2,
      "max": 4
    },
    {
      "id": "childrenA",
      "label": "Children — Family A",
      "kind": "number",
      "hint": null,
      "default": 1,
      "unit": null,
      "min": 1,
      "max": 5
    },
    {
      "id": "childrenB",
      "label": "Children — Family B",
      "kind": "number",
      "hint": null,
      "default": 2,
      "unit": null,
      "min": 1,
      "max": 5
    },
    {
      "id": "hoursA",
      "label": "Hours per week — Family A",
      "kind": "number",
      "hint": null,
      "default": 45,
      "unit": null,
      "min": 1,
      "max": null
    },
    {
      "id": "hoursB",
      "label": "Hours per week — Family B",
      "kind": "number",
      "hint": null,
      "default": 45,
      "unit": null,
      "min": 1,
      "max": null
    },
    {
      "id": "baseShare",
      "label": "Share of cost that's a flat per-family base",
      "kind": "number",
      "hint": null,
      "default": 50,
      "unit": "%",
      "min": 0,
      "max": 100
    }
  ],
  "outputs": [
    {
      "id": "familyA",
      "label": "Family A weekly share",
      "format": "currency",
      "hint": null,
      "primary": true
    },
    {
      "id": "familyB",
      "label": "Family B weekly share",
      "format": "currency",
      "hint": null,
      "primary": false
    },
    {
      "id": "perFamilyBase",
      "label": "Flat base per family",
      "format": "currency",
      "hint": null,
      "primary": false
    },
    {
      "id": "addonPerKid",
      "label": "Add-on per child",
      "format": "currency",
      "hint": null,
      "primary": false
    },
    {
      "id": "total",
      "label": "Total weekly wage",
      "format": "currency",
      "hint": null,
      "primary": false
    }
  ],
  "worked_example": {
    "inputs": [
      "Nanny's total weekly wage: 1000 $",
      "Number of families: 2",
      "Children — Family A: 1",
      "Children — Family B: 2",
      "Hours per week — Family A: 45",
      "Hours per week — Family B: 45",
      "Share of cost that's a flat per-family base: 50 %"
    ],
    "outputs": [
      "Family A weekly share: $416.67",
      "Family B weekly share: $583.33",
      "Flat base per family: $250.00",
      "Add-on per child: $166.67",
      "Total weekly wage: $1,000.00"
    ]
  },
  "how_to": {
    "title": "How to use this",
    "steps": [
      "Enter nanny's total weekly wage ($).",
      "Enter number of families.",
      "Enter children — family a.",
      "Enter children — family b.",
      "Enter hours per week — family a.",
      "Enter hours per week — family b.",
      "Enter share of cost that's a flat per-family base (%).",
      "Read your family a weekly share on the right — it updates as you type.",
      "Hit Share to keep the scenario or send it to someone."
    ]
  },
  "scenarios": [
    {
      "name": "Conservative",
      "description": "Lower-end numbers — what if things land soft?",
      "values": {
        "totalWage": 600,
        "families": 2,
        "childrenA": 1,
        "childrenB": 1,
        "hoursA": 27,
        "hoursB": 27,
        "baseShare": 30
      }
    },
    {
      "name": "Typical",
      "description": "Defaults — the most common real-world setup.",
      "values": {
        "totalWage": 1000,
        "families": 2,
        "childrenA": 1,
        "childrenB": 2,
        "hoursA": 45,
        "hoursB": 45,
        "baseShare": 50
      }
    },
    {
      "name": "Ambitious",
      "description": "Higher-end numbers — what if things really pop?",
      "values": {
        "totalWage": 1600,
        "families": 3,
        "childrenA": 2,
        "childrenB": 3,
        "hoursA": 72,
        "hoursB": 72,
        "baseShare": 80
      }
    }
  ],
  "limitations": [
    "Results are estimates before tax, fees, and inflation unless an input explicitly covers them.",
    "Rates are treated as fixed for the whole period — variable-rate products will drift from this projection.",
    "This is educational maths, not financial advice. Check anything contractual with the lender or your accountant."
  ],
  "faq": [
    {
      "q": "Why not just split 50/50?",
      "a": "Straight 50/50 works only when both families have equal kids and equal hours. The moment one family adds a second child or uses fewer hours, a flat split either overcharges or undercharges — the base-plus-per-child model reflects that a nanny watching three kids works harder than watching one, without penalizing the smaller family for the whole gap."
    },
    {
      "q": "Who's the legal employer in a nanny share?",
      "a": "Usually each family should be a co-employer with its own payroll and tax filing for its share of wages, or one family is the primary employer and the other pays them directly as a shared-cost arrangement. Get this in writing — the IRS doesn't recognize an informal split as two separate 'part-time' jobs automatically."
    },
    {
      "q": "How do we handle sick days or when one family's kid is absent?",
      "a": "Most shares still pay the nanny full daily rate regardless of which kids show up, since she's on the clock either way. Build this expectation into the written agreement up front so nobody argues over a $40 day after the fact."
    }
  ],
  "related": [
    "https://www.revenuelab.fyi/toolbox/nanny-total-cost",
    "https://www.revenuelab.fyi/toolbox/babysitter-rate"
  ],
  "license": "CC-BY-4.0",
  "citation": "RevenueLab — Nanny Share Split Calculator (https://www.revenuelab.fyi/toolbox/nanny-share-split)"
}