Most short-term rental models fit on a single screen. Nightly rate, occupancy, 365 nights, a mortgage line, and a figure at the bottom that makes the purchase look sensible. The arithmetic is rarely wrong; what is missing is everything sitting between gross booking value and the money that lands in the account.
Owners two seasons in already know this, usually because a January bank statement taught them. Owners still modelling a purchase tend to price that gap at zero, which is the main reason projected property investment returns and realised ones part company in the first year.
Airbnb’s Fee Change Rewrites the Commission Maths
Airbnb has spent the past year retiring the fee structure most owners built their numbers around. Under the old split, hosts paid about 3% and guests paid a separate 14.1% to 16.5% at checkout. In its place is a single service fee of 15.5% taken out of the host payout, and Airbnb’s own guidance puts the deadline for adjusting prices at September 15 for hosts outside the European Economic Area and October 13 for hosts inside it or in Switzerland. The worked example Airbnb uses is unsentimental: leave a listing at $100, and the payout is $84.50.
What damages a model is not the headline percentage but the fee base. Airbnb calculates the service fee on the nightly price plus any fees the host adds, taxes excluded, which makes a cleaning fee commissionable revenue rather than a cost recovered from the guest. Set cleaning at $120 and around $19 of it is gone before it reaches you.
Booking.com is structured differently and lands in a similar place. Commission is a set percentage agreed per property, charged on the reservation and on additional charges such as cleaning though not on local city taxes, and optional visibility programmes lift the effective rate in exchange for ranking. The contract rate is rarely the rate you actually pay; that number only appears when a year of commission invoices is divided by a year of channel revenue.
Why the Second Property Changes the Cost Model
Short-term rental business costs change shape rather than simply doubling when a second unit arrives, and the shift catches out owners who modelled property two as a copy of property one. Occasional tasks become scheduled ones. Guest messaging that fitted around a job now arrives across two calendars. Cleaner availability becomes a rota rather than a phone call, and pricing decisions made on instinct for one property turn into a weekly job across three. Owners at that point end up making a straight cost comparison, whether or not they frame it that way.
A management company charges a percentage of revenue and absorbs the work. A co-host takes less and does less. Moving calendars, messaging, payments and channel sync into vacation rental software turns a variable claim on revenue into a fixed monthly cost. The comparison only works once the owner’s own hours carry a number, and most first-time models leave that cell empty. Rental operating expenses at two properties are not twice those at one; the owner’s hours very nearly are, and those hours are the only line in the model with no invoice behind them.
Turnover Is Priced per Departure, Not per Night
Cleaning is booked against checkouts, which is where occupancy stops being a useful headline. Two three-night stays and one six-night stay produce identical occupancy and identical revenue at the same rate, and the first costs twice as much to service. That single fact is the whole argument for minimum stays, and it explains how a city apartment can lead its market on occupancy and trail it on margin.
The labour underneath that line has a floor. US federal wage data put the median hourly wage for maids and housekeeping cleaners at $17.07 in May 2025, and a turnover is not one hour of work: strip, launder, restock, inspect, photograph, report.
Contract cleaners price it as a job rather than an hour, and the job costs more when it has to fit between an 11am checkout and a 3pm check-in. Most guides on how to start an Airbnb business treat cleaning as a fee charged to the guest when it behaves like a scheduling constraint with a wage attached. The cleaner, not the calendar, decides whether a same-day turn is possible, and one late checkout in July costs a night of revenue rather than an hour of labour.
Your Fixed Costs Do Not Have an Off-Season
Seasonality gets priced into revenue forecasts and almost never into the cost side. Eurostat’s platform data shows that 33.1% of all guest nights booked through Airbnb, Booking and Expedia across the EU in 2025 fell in July and August alone, 15.7% in July and 17.5% in August, while January, February, March and November each accounted for 4% to 5% of the year. Croatia was the extreme case, with 57% of its year landing in those two months. Mortgage interest, insurance, broadband, standing utility charges and any service charge ignore that curve completely.
A heated property in a cold market can cost more to keep empty in February than to run full in August, because an empty home still has to stay above freezing. Ownership structure matters here too. Condos as rental property carry HOA or service charges that behave like a second, smaller mortgage, and a special assessment for a roof or an elevator arrives with no interest in your booking calendar. Property investment returns modelled on a peak-season nightly rate rarely survive a full year of that arithmetic.
Compliance Costs More Than the Licence Fee
Compliance has become a recurring operating line rather than a one-off setup task. Regulation (EU) 2024/1028 has applied across the European Union since 20 May 2026: units need a national registration number, platforms verify that number before a listing goes live, and activity data flows to a single digital entry point in each member state. Cities and states elsewhere have moved in the same direction with registration schemes, night caps and tourist tax collection.
None of that is expensive in cash, but it is expensive in attention, and it is hard to delegate at precisely the point in the year when the property is busiest. Registration renewals, tax filings and guest data submissions do not respect the calendar the revenue sits on.
FAQs
What Share of Revenue Goes to Rental Operating Expenses?
No universal figure is reliable, and any number quoted without a market attached should be treated with suspicion. What can be modelled is the structure: commission takes a percentage of every booking, turnover costs scale with the number of stays rather than nights, and fixed costs run for twelve months regardless of what the calendar looks like. Build the figure from a full year of your own costs rather than relying on an industry average.
Does Charging a Cleaning Fee Cover the Cost of Cleaning?
Only partly. On Airbnb, the cleaning fee sits inside the booking subtotal used to calculate the service fee, so the platform takes its percentage of that too. High cleaning fees also weigh disproportionately on short stays, where they can push the total cost of a two-night booking beyond what a guest is willing to pay.
Is Direct Booking Actually Cheaper?
It can be, but it moves the cost rather than removing it. Commission is replaced by payment processing, a website, marketing and the admin of handling bookings and cancellations yourself. It becomes cheaper when repeat guests and referrals reduce the acquisition cost the platform previously absorbed.
What Changes Most When a Second Property Arrives?
The owner’s time, well before any cash line. Guest messaging, pricing, turnovers and maintenance now have to be managed across two calendars, but two properties rarely justify a manager on the numbers alone. That is why the second property is often where operators either systemise or stall.
What the Next Two Months Will Surface
The fee migration deadlines in September and October are a hard date, and they separate owners who reprice from owners who take the difference out of their own margin without noticing for a quarter. Every cost line above existed before that change, but a repricing deadline forces the whole stack into view at once, and a portfolio that only worked at the old commission rate was never really working.
