{
  "slug": "aircraft-partnership-cost-share",
  "title": "Aircraft Partnership Cost Share Calculator",
  "heading": "Aircraft Partnership Cost Share Calculator",
  "category": "financial",
  "url": "https://www.revenuelab.fyi/toolbox/aircraft-partnership-cost-share",
  "summary": "Split fixed and variable ownership costs fairly across partners.",
  "description": "A well-structured partnership can cut per-hour ownership cost by more than half compared to sole ownership, but only if the cost split matches how the airplane is actually used. This calculator splits fixed costs (hangar, insurance, loan, annual) evenly across partners since those exist regardless of who flies more, then allocates variable costs (fuel, maintenance reserve) by each partner's actual hours, producing a fair total and per-hour cost for each partner rather than a flat equal split that penalizes low-hour partners.",
  "formula": "Each partner's fixed share = total fixed costs ÷ number of partners. Each partner's variable cost = their hours × variable cost per hour. Total per partner = fixed share + variable cost.",
  "dateModified": "2026-09-30",
  "run_url": "https://www.revenuelab.fyi/api/public/calc?tool=aircraft-partnership-cost-share",
  "inputs": [
    {
      "id": "partners",
      "label": "Number of partners",
      "kind": "number",
      "hint": null,
      "default": 3,
      "unit": null,
      "min": 2,
      "max": 10
    },
    {
      "id": "fixedAnnual",
      "label": "Total annual fixed costs",
      "kind": "number",
      "hint": null,
      "default": 16000,
      "unit": "$",
      "min": 0,
      "max": null
    },
    {
      "id": "variableRate",
      "label": "Variable cost per hour (fuel + reserves)",
      "kind": "number",
      "hint": null,
      "default": 55,
      "unit": "$/hr",
      "min": 0,
      "max": null
    },
    {
      "id": "myHours",
      "label": "Your hours flown per year",
      "kind": "number",
      "hint": null,
      "default": 60,
      "unit": null,
      "min": 0,
      "max": null
    },
    {
      "id": "totalHours",
      "label": "Total hours flown by all partners",
      "kind": "number",
      "hint": null,
      "default": 180,
      "unit": null,
      "min": 1,
      "max": null
    }
  ],
  "outputs": [
    {
      "id": "myTotal",
      "label": "Your annual cost",
      "format": "currency",
      "hint": null,
      "primary": true
    },
    {
      "id": "fixedShare",
      "label": "Your fixed cost share",
      "format": "currency",
      "hint": null,
      "primary": false
    },
    {
      "id": "myVariable",
      "label": "Your variable (usage) cost",
      "format": "currency",
      "hint": null,
      "primary": false
    },
    {
      "id": "myHourlyCost",
      "label": "Your effective cost per hour",
      "format": "currency",
      "hint": null,
      "primary": false
    },
    {
      "id": "savingsVsSole",
      "label": "Savings per hour vs sole ownership",
      "format": "currency",
      "hint": null,
      "primary": false
    }
  ],
  "worked_example": {
    "inputs": [
      "Number of partners: 3",
      "Total annual fixed costs: 16000 $",
      "Variable cost per hour (fuel + reserves): 55 $/hr",
      "Your hours flown per year: 60",
      "Total hours flown by all partners: 180"
    ],
    "outputs": [
      "Your annual cost: $8,633",
      "Your fixed cost share: $5,333",
      "Your variable (usage) cost: $3,300",
      "Your effective cost per hour: $143.89",
      "Savings per hour vs sole ownership: $0.00"
    ]
  },
  "how_to": {
    "title": "How to use this",
    "steps": [
      "Enter number of partners.",
      "Enter total annual fixed costs ($).",
      "Enter variable cost per hour (fuel + reserves) ($/hr).",
      "Enter your hours flown per year.",
      "Enter total hours flown by all partners.",
      "Read your your annual cost 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": {
        "partners": 2,
        "fixedAnnual": 9500,
        "variableRate": 35,
        "myHours": 35,
        "totalHours": 110
      }
    },
    {
      "name": "Typical",
      "description": "Defaults — the most common real-world setup.",
      "values": {
        "partners": 3,
        "fixedAnnual": 16000,
        "variableRate": 55,
        "myHours": 60,
        "totalHours": 180
      }
    },
    {
      "name": "Ambitious",
      "description": "Higher-end numbers — what if things really pop?",
      "values": {
        "partners": 5,
        "fixedAnnual": 25500,
        "variableRate": 90,
        "myHours": 95,
        "totalHours": 290
      }
    }
  ],
  "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": "Is an even fixed-cost split always fair?",
      "a": "It's fair when partners have roughly similar usage and similar say in scheduling priority. If one partner flies far more than others, some partnerships weight part of the fixed cost by hours too, or require the high-usage partner to buy a larger ownership share up front, so a pure even split isn't universal — read your partnership agreement's cost formula carefully."
    },
    {
      "q": "What costs go in the fixed pool versus variable pool?",
      "a": "Fixed: hangar or tie-down rent, insurance premium, loan payment, annual inspection base cost, state registration. Variable: fuel, oil, and reserve funds for engine overhaul and routine maintenance that scale with hours flown. Some partnerships also fund a shared reserve account per hour flown to prevent a scramble when a big bill (like an engine overhaul) comes due."
    },
    {
      "q": "How many partners is optimal?",
      "a": "Three to four is the most common sweet spot — enough to meaningfully cut fixed cost per partner without creating scheduling conflicts that limit each partner to too few available days. Beyond five or six partners, scheduling friction and disagreements over maintenance decisions tend to outweigh the additional cost savings."
    },
    {
      "q": "What happens to the ongoing cost split if a partner leaves?",
      "a": "Most partnership agreements require the buyout of an exiting partner's equity share at appraised value, and the remaining partners then either absorb the higher per-person fixed share or recruit a replacement partner. Building an exit clause into the agreement before it's needed avoids disputes later."
    }
  ],
  "related": [
    "https://www.revenuelab.fyi/toolbox/aircraft-ownership-cost-per-hour",
    "https://www.revenuelab.fyi/toolbox/aircraft-leaseback-roi",
    "https://www.revenuelab.fyi/toolbox/hangar-vs-tiedown-cost"
  ],
  "license": "CC-BY-4.0",
  "citation": "RevenueLab — Aircraft Partnership Cost Share Calculator (https://www.revenuelab.fyi/toolbox/aircraft-partnership-cost-share)"
}