Case study: a Sunreef-70-class catamaran in the Mediterranean
The pre-loaded numbers describe a ~70 ft luxury crewed catamaran (€4.8–7M, Sunreef-70 class) chartering in the Mediterranean on MYBA terms. Modern 70 ft luxury cats list at €50,000–75,000 per week gross; a crewed yacht that books 12 weeks is considered a successful season — 20+ is exceptional. Of the gross, 25–38% goes to brokers and charter management. The owner carries the full programme: 3–4 professional crew (€190–320k/yr), maintenance and refit reserve, insurance, berthing, fuel — typically 8–12% of the yacht's value every year. After a 10-year horizon the yacht sells at 35–55% of her original price, less an ex-charter discount. Unlike a production charter boat, a crewed superyacht's charter income offsets her costs — it very rarely covers them. This analysis shows honestly how much of the bill chartering pays.
1 · Your Assumptions
Pre-filled values are industry-typical figures for a ~70 ft luxury crewed catamaran in Mediterranean charter (sources below). Adjust every field to your yacht and programme. For uncertain inputs you set three values: worst · most likely · best.
Acquisition
Charter Revenue
Annual Running Costs (paid whether she charters or not)
Financial Settings
2 · Results
What chartering is worth to you — total benefit over the full horizon
Each bar counts simulated scenarios by the total advantage of chartering vs. keeping the yacht fully private (in today's euros, after discounting). Green = chartering left you better off · red = it would not have paid.
Chance the charter benefit reaches at least…
Read it like this: "There is an X% chance that chartering improves my position by the shown amount or more."
Typical year — running costs vs. charter income
Median annual figures (year-1 money). Green is what charter puts in; red is what the full crewed programme costs.
What moves the needle — sensitivity
How strongly each assumption drives the charter benefit across all scenarios (rank correlation). Long bars deserve your hardest scrutiny before you sign anything.
3 · Your Report
A self-contained summary of this simulation — ready to print, save as PDF, or hand to your co-owner, bank or tax adviser.
Monte Carlo Simulation Report
How to read these numbers
This report does not predict one future — it maps all plausible futures given the assumptions below. The simulation built complete multi-year scenarios of the same yacht, each one lived twice: once in a professional charter programme, once kept fully private. In every scenario, season quality, rates and costs were drawn at random from the ranges you set (weighted toward the most-likely value — the same method used in project finance and engineering, named after the Monte Carlo casino). The difference between the two lives is the charter benefit: the value chartering adds for you, after commissions, charter wear, set-up costs and the lower resale price of an ex-charter yacht. The crew, like all running costs, is paid in both lives — a crewed yacht keeps her crew whether she charters or not.
Assumptions used in this simulation
All values were set by the user at the time of the simulation. Three-value entries read: worst case · most likely · best case.
Scope & limitations. Educational decision support, not financial, tax or investment advice. Inputs are drawn independently; VAT, the tax treatment of charter income, financing and flag-state specifics are not modelled — consult a maritime tax adviser before committing. Results are exactly reproducible from the assumptions listed above. Generated locally in the browser — no data was transmitted or stored.
How this works — the Monte Carlo method
One number is a lie
Any spreadsheet that tells you "your yacht will earn €X" hides the truth: charter weeks, rates and costs are uncertain. A crewed yacht can book 8 weeks or 18. Pretending to know the average is how owners get disappointed.
We roll the dice — thousands of times
For every uncertain input you give a worst, most-likely and best value. The simulator draws a random value from each range (weighted toward your most-likely figure), builds one complete ownership scenario, and computes the result. Then it repeats this 10,000 times.
You see probabilities, not promises
The result is a distribution: the chance chartering pays, the realistic middle, and what the good and bad tails look like. Named after the Monte Carlo casino, the method is standard practice in project finance, insurance and engineering.
The model, precisely
- Two parallel lives are simulated for every scenario: the same yacht, the same years, once with a charter programme and once kept fully private. The headline numbers are the difference between the two.
- Owner charter income = weekly rate × chartered weeks × (1 − commission) − variable cost per charter week − owner-use opportunity cost. APA and charter VAT are paid by guests and never touch the owner's P&L.
- Running costs (paid in both lives): crew payroll, maintenance & refit reserve, insurance, berthing, fuel, management — escalated by inflation each year. A crewed yacht keeps her crew year-round, chartered or not, so crew cancels out of the benefit but dominates the total cost of ownership.
- Resale: after the horizon the yacht sells at the residual % of price; the charter life additionally carries the ex-charter discount (15–25%) and the initial charter set-up cost — the private life pays neither.
- NPV (net present value) discounts every future cash flow back to today at your discount rate. The charter benefit shown is NPV(with charter) − NPV(private) — positive means chartering paid.
- Uncertain inputs use triangular distributions (worst/most-likely/best); draws are independent across inputs. Each year's charter season is drawn separately, so good and bad seasons mix within one scenario.
Where the default numbers come from
Pre-filled ranges reflect published 2023–2026 market data for ~70 ft luxury crewed catamarans in Mediterranean charter: list prices and brokerage listings (Sunreef, YachtBuyer, itBoat), charter listings (YachtCharterFleet — modern Sunreef 70s at $59–79k/week), MYBA/CYBA commission standards, crew salary surveys (YPI Crew, Dockwalk), operating-cost guidance (BOAT International, Lengers Yachts, 212 Yachts — the verified "10% rule"), depreciation curves (The Multihull Company, YATCO) and the ~12-week "successful season" benchmark (26 North, Lengers). They are starting points, not advice — replace them with quotes for your yacht.
Important. This simulator is an educational decision-support tool, not financial, tax or investment advice. Results depend entirely on your assumptions. VAT, the tax treatment of charter income, financing and flag-state specifics vary by jurisdiction and owner residency and are not modelled — consult a maritime tax adviser before committing. All calculations run locally in your browser; no data is transmitted or stored.