Rental Arbitrage Profitability and Breakeven Math

Rental arbitrage profit is what is left after nightly booking revenue covers your fixed rent and your monthly operating costs. The model earns money when your ADR and occupancy rate push gross revenue above the cost stack by enough margin to pay back your startup outlay in a reasonable window. This page walks the unit economics on one consistent example so you can judge a lease before you sign it.

The math runs on a 30.44 day month, the calendar average once you spread 365 days across 12 months. That number matters because rent is billed as a fixed monthly amount while your revenue is priced per night. Multiply your nightly rate by 30.44 and you get the revenue ceiling at 100 percent occupancy; every real month lands below it.

One figure decides a deal: break-even occupancy, the share of nights you have to book at your nightly rate to cover rent and expenses. Below that line you lose money, above it you keep the difference. Pin this number down before furniture, photography, or software enter the budget.

Revenue drivers: ADR, occupancy, and stay length

Three inputs set your top line. ADR is the average daily rate a guest pays across a month, net of discounts. Occupancy rate is the percentage of available nights that sell. Stay length sits underneath both: longer bookings cut cleaning turnovers and vacancy gaps but often trade away the premium a two or three night stay commands.

Raising ADR lifts revenue faster than chasing the last few points of occupancy, because each booked night earns more without adding cost. Dynamic pricing adjusts your rate by day of week, season, and local demand, so you are not leaving money on high-demand dates or sitting empty on soft ones. A realistic target pairs a defensible ADR with an occupancy rate the local market supports, not a headline rate you can hit only two weekends a month.

The cost stack

Your costs split into fixed monthly, variable per stay, and one-time.

• Fixed monthly: rent under your master lease, renter's or short-term rental insurance, utilities, internet, and any parking or amenity fees.
• Variable per stay: restocking consumables and, for most operators, cleaning. Cleaning is a pass-through when the guest pays a cleaning fee that matches what you pay the cleaner, which keeps it profit-neutral rather than a drag on margin.
• Platform fees: these vary by channel and change over time, so treat them as a haircut on gross revenue rather than a fixed line. Airbnb is moving hosts from a roughly 3 percent split fee to a host-only fee of about 15.5 percent during 2026, so check which structure applies to your account, Vrbo charges a 5 percent commission plus 3 percent payment processing, and Booking.com commission varies by market. Confirm the current structure for your channels before you model them.

One-time startup costs (furniture, housewares, photography, the security deposit, and first-month setup) do not hit monthly profit, but they set the payback clock the next sections cover.

Break-even occupancy: the go or no-go metric

Break-even occupancy is the cleanest go or no-go test for a unit. The formula is:

break-even occupancy = (monthly rent + other monthly expenses) / (nightly rate x 30.44)

Take the calculator defaults: $2,000 rent, a $150 nightly rate, and $200 in other monthly expenses. That gives (2,000 + 200) / (150 x 30.44) = 2,200 / 4,566, or 48.2 percent. You need to sell just under half your nights to break even. If the local market comfortably supports 60 to 70 percent occupancy at that rate, the unit has room to profit. If you would be fighting for every night to clear 48 percent, the lease is too expensive for the rate you can charge, and no software fixes that.

Payback on startup costs

Monthly profit is nightly revenue minus rent minus other expenses. Run the same example at 65 percent occupancy: 0.65 x 30.44 gives 19.79 booked nights, and 19.79 nights at $150 is $2,968 in nightly revenue. Subtract $2,000 rent and $200 expenses and you keep $767.90 a month, before platform fees, which this example and the calculator leave out.

Now bring in startup costs. At $15,000 to furnish and launch, payback is $15,000 / $767.90, or just under 20 months of steady operation. That horizon is why a one or two year master lease with a thin margin is fragile: a few soft months early can push payback past the point where the lease comes up for renewal. The calculator below lets you flex rent, rate, occupancy, and startup spend to see how the payback window moves.

What breaks the model

Three forces turn a working unit into a losing one.

• Seasonality: a market that supports 70 percent occupancy in summer can fall to 40 percent in winter. Model the low season, not the annual average, and confirm the weak months still clear break-even.
• Rate compression: when new supply floods a neighborhood, ADR and occupancy fall together. Your rent is locked by the lease while revenue slides, squeezing margin from both sides.
• Fee and cost changes: platform fee structures shift, utilities rise, and a landlord can raise rent at renewal. Because arbitrage margin is thin relative to owning, a 10 to 15 percent swing in costs can erase the profit the numbers showed on day one.

Underwrite each unit at conservative occupancy and a defensible ADR, keep a cash buffer for soft months, and re-check break-even whenever a major cost moves. The unit that survives a weak season is the one you underwrote on the low season in the first place.