Why a short-term rental needs its own arithmetic
A long-term rental has one revenue line and a handful of expenses. A short-term rental has revenue built from a nightly rate and an occupancy percentage, a cleaning fee that is income and a cleaning cost that is not, a platform taking a cut, and a management fee several times what a long-term manager charges. Run it through a standard rental calculator and the answer will be wrong in both directions at once.
This page builds the month from the pieces: nights booked, turnovers, what each produces and what each costs. The figure it works toward is the one that actually governs a short-term rental — the occupancy you need to break even, rather than the occupancy you hope for.
Reading the example this page loads with
The defaults describe a furnished property at a plausible nightly rate and a realistic occupancy. These figures are illustrative — a teaching example, not market data for any particular city.
| Input | Value |
|---|
| Purchase price · closing · furnishing | $310,000 · $7,000 · $18,000 |
| Down · rate · term | 20% · 7.25% · 30 yrs |
| Nightly rate · occupancy | $195 · 58% |
| Average stay · cleaning fee / cost | 3.5 nights · $120 / $110 |
| Platform · management | 3% · 20% |
| Taxes · insurance (annual) | $3,600 · $2,400 |
| Utilities · supplies (monthly) | $280 · $90 |
At 58% occupancy the property books 17.6 nights of an average 30.4-night month, which at $195 produces $3,438 of rental revenue. Those nights come in stays averaging 3.5 nights, so there are about 5 turnovers, generating $605 of cleaning fees against $554 of cleaning cost.
The deductions are where it diverges from a long-term rental. Management at 20% of rental revenue is $688 — the single largest operating line, more than taxes and insurance combined. The platform takes $103, maintenance and capital reserves take $172 each, and taxes, insurance, utilities and supplies add $670. Net operating income is $1,484 a month. The $248,000 loan costs $1,692, so monthly cash flow is -$208, a cap rate of 5.74% and a cash-on-cash return of -2.87% on $87,000 invested.
The breakeven occupancy is the number to remember
This property needs 63.2% occupancy to cover its costs, and the example runs it at 58%. That five-point gap is the whole deficit, and it is a more useful way to hold the risk than a cash flow figure, because occupancy is the input that moves most and that you control least.
Treat it as the question to research before buying: not "can this property achieve 58%?" but "what does a comparable listing in this specific area actually sustain across a full year, including the off-season?" Annual averages hide a great deal — a market that runs 85% in summer and 30% in winter averages 58% while producing months that cannot pay the mortgage, and the mortgage arrives monthly regardless. A property that breaks even at 63% in a market that averages 65% is not a comfortable margin.
Cleaning is not a profit centre
The cleaning fee and the cleaning cost nearly cancel: $605 collected against $554 paid, leaving about $50 a month. Guests experience the cleaning fee as part of the price, so it suppresses bookings like a price increase, while the money passes almost entirely to the cleaner.
The field worth attention is average length of stay, because turnovers scale inversely with it and every turnover is a cleaning. Drop the average stay from 3.5 nights to 2 and the same booked nights produce nearly nine turnovers instead of five, adding cost and work for identical revenue. Shorter stays also mean more guest communication, more wear and more risk of a bad weekend. Pricing and minimum-stay rules are the levers, and they are worth modeling here before setting them on the platform.
Management at 20%, and what self-managing really swaps
Twenty percent of rental revenue is in the normal range for short-term management and it is the line that most changes the outcome. Set it to zero — self-managing — and the same property swings from -$208 to roughly +$480 a month, which turns a losing deal into a working one on that input alone.
That is a real option and it is not free. Self-managing a short-term rental means guest messaging at unsociable hours, pricing and calendar management, coordinating cleaners between same-day checkouts, and handling the booking that goes wrong while you are at work. It is a part-time job rather than a line item, and the honest way to use this field is to decide first whether you will genuinely do that work for years, then enter the figure that matches the answer. A deal that only works self-managed is a deal that depends on you not getting tired.
The costs that make this a different asset
Furnishing is $18,000 here, which is 21% of the $87,000 of cash required and buys nothing a lender will lend against — it is capital that converts straight into depreciating contents. It also recurs: furniture in a short-term rental is consumed rather than owned, and the capital reserve on this page is sized against the building rather than the inventory.
Two further exposures sit outside the arithmetic entirely. Insurance for short-term letting is a different product from a landlord policy and usually costs more, and a standard policy may not respond to a claim arising from paid guest occupancy — worth confirming with your insurer rather than assuming. And regulation is the larger risk: many cities now cap, license or prohibit short-term letting, and rules can change after you buy. A permit regime that tightens does not reduce your returns, it ends them, and the property then has to work as a long-term rental.
Always check the long-term fallback
Because of that, the most important companion test is whether the property stands up as a conventional rental. Run it through the single-family rental analyzer at a long-term market rent and see what it produces. If the answer is comfortably positive, short-term letting is upside on a sound asset. If the answer is deeply negative, the whole investment rests on a revenue model a city council can change, and you should price that risk rather than ignore it.
Our comparison of short-term versus long-term rentals covers the trade in more depth, and where to find your numbers covers sourcing the inputs. Of these, nightly rate and occupancy deserve the most scrutiny: they should come from what comparable listings in that specific submarket actually achieved over a full year, not from a headline average or a platform's projection.