Real Estate Tax Calc
The formula is the same — the inputs are not
Cash-on-cash return is annual pre-tax cash flow divided by total cash invested, the same as for any rental. What changes with a short-term rental (STR) is both halves of that fraction. Revenue per night is usually far higher than a long-term lease would produce, but the expense load is heavier and the cash you must put in up front is larger.
On the investment side, STRs require furnishing and setup — beds, kitchenware, linens, decor, smart locks, and a starter stock of supplies — often $10,000 to $30,000 that a long-term rental never needs. That cash belongs in your denominator and can meaningfully lower the return, so do not leave it out.
Model the real operating costs
STR expenses that quietly erode cash flow include: cleaning between stays, platform fees (which vary by platform and fee model), management (STR managers commonly charge 20–30% of revenue, versus 8–10% for long-term rentals), utilities and internet (you pay them, not the tenant), consumables (toiletries, coffee, paper goods), plus higher maintenance and wear from frequent turnover.
Seasonality is the biggest trap. A property that rents 90% of nights in summer may sit at 40% in the off-season. Model a realistic annual occupancy and average daily rate rather than annualizing a peak month, and hold back a reserve for the slow season.
A quick example
Suppose you buy with $60,000 down, $9,000 in closing costs, and $21,000 to furnish — $90,000 of cash invested. The property grosses $70,000 a year at a realistic 55% occupancy. Subtract about $37,000 in operating costs (cleaning, fees, management, utilities, supplies, and maintenance) and $24,000 in annual mortgage payments, and you are left with roughly $9,000 of pre-tax cash flow. That is $9,000 ÷ $90,000 = a 10% cash-on-cash return.
Run your own figures in the calculator below, and stress-test the occupancy assumption first — a 55% year versus a 70% year can swing the return by half. On the tax side, remember cash-on-cash is a pre-tax metric; STRs with an average stay of seven days or less can unlock cost segregation and non-passive loss treatment that improves your after-tax result well beyond the headline number.
Build the pro forma from the bottom up
The single biggest error in STR underwriting is starting from a peak-month figure and annualizing it. Build the revenue line the other way: estimate a realistic average daily rate (ADR) and a full-year occupancy, then multiply. Annual revenue = ADR × 365 × occupancy. A $220 ADR at 55% occupancy is $220 × 365 × 0.55 ≈ $44,200 — a number you can defend, not a summer weekend extrapolated across twelve months. Pull comparable ADR and occupancy data from your market rather than the listing you hope to beat.
On the expense side, list every recurring cost as its own line: cleaning (per turnover, so it scales with bookings), platform service fees, management, utilities and internet, consumables restock, licensing and lodging-tax filing costs, insurance (short-term rental coverage costs more than a landlord policy), HOA dues, repairs, and a capital-expenditure reserve. STRs suffer more wear than long-term rentals because guests turn over constantly, so a reserve of a few percent of revenue is prudent, not optional.
Furnishing and startup cash change the denominator
Cash-on-cash is only as honest as its denominator. Beyond the down payment and closing costs, an STR needs a full furnishing and setup budget — beds, sofas, a stocked kitchen, linens in multiples, outdoor furniture, electronics, smart locks, a starter supply of consumables, and often professional photography. This routinely runs $15,000 to $35,000 and is real out-of-pocket cash, so it belongs in total cash invested.
Two other startup items are easy to forget: the ramp-up period before your listing gains reviews and ranking (budget for a few slow months of below-target occupancy), and any permit or licensing fees your city charges up front. Underwriting that ignores the furnishing check and the review-building ramp will overstate the first-year return, sometimes dramatically.
Regulation risk is a return risk
Short-term rental returns depend on rules that can change overnight. Many cities cap the number of nights a property may be rented, require the owner to live on-site, ban non-owner-occupied STRs in certain zones, or impose permit lotteries. A regulatory change can cut a property's legal operating nights in half — or force a conversion to long-term rental at a much lower rent. When you model an STR, ask what the property earns as a long-term rental as your downside case; if the deal only works at STR revenue and would be underwater as a standard lease, you are taking concentrated regulatory risk.
Also confirm the local occupancy or lodging tax obligations. Most jurisdictions require STR operators to collect and remit a transient occupancy tax; platforms sometimes collect it for you and sometimes do not. Getting this wrong creates a liability that has nothing to do with income tax but can erase a year of profit.
The tax layer that changes the after-tax return
Cash-on-cash is a pre-tax metric, but STRs have a tax profile that can make the after-tax number look very different. If the average guest stay is seven days or less, the activity is not a 'rental activity' under the passive activity rules — it is treated more like a business. If you also materially participate, losses are non-passive and can offset your W-2 or business income. Pair that with a cost segregation study and bonus depreciation and the first-year paper loss can be large, sheltering other income and boosting your after-tax return well beyond the headline cash-on-cash figure. This combination is what people mean by the 'short-term rental loophole.'
There is a catch few pro formas mention: an STR business with substantial personal services may generate self-employment income, and even without material participation you may owe lodging and sales taxes. And when you sell, the accelerated depreciation is recaptured — the 1245 components at ordinary rates. Model the deferral honestly rather than treating the tax loss as free money.
A downside-case example
Return to the earlier deal — $90,000 invested, projected $9,000 of pre-tax cash flow, a 10% cash-on-cash return. Now stress it. Suppose occupancy comes in at 45% instead of 55% because of a new registration cap, dropping gross revenue by roughly $12,000. Operating costs fall only slightly (cleaning scales with bookings, but utilities, insurance, and management minimums do not), so cash flow might drop to around $2,000 — a 2.2% cash-on-cash return before you have paid a dime of income tax. The same property as a long-term rental might net $4,000. This is why the honest STR analysis always carries three scenarios — base, upside, and a regulation-or-recession downside — rather than a single optimistic line.
Leverage, financing, and the debt-service trap
Because STR income is volatile, the loan you place on the property has an outsized effect on cash-on-cash return — and on survival. A higher loan balance lifts the return in a strong year (you control more property with less of your own cash) but magnifies the pain in a weak one, because the mortgage payment is fixed while revenue swings with occupancy. A property that clears a 12% cash-on-cash return at 65% occupancy can turn cash-flow-negative at 45% occupancy purely because of the debt-service load.
Financing an STR is also harder than a long-term rental: many lenders will not underwrite to projected nightly income and instead qualify the property on its long-term rental value or require a larger down payment. That larger down payment raises your cash invested (lowering the return) but also lowers the debt-service risk — a genuine tradeoff to model, not a free choice. Run your cash-on-cash at your actual loan terms, then re-run it at a stressed occupancy to see whether the debt is a lever or a liability.
Frequently asked questions
Do short-term rentals have higher cash-on-cash returns?
They can, because nightly revenue is higher — but only after accounting for cleaning, platform and management fees, utilities, furnishing costs, and seasonal vacancy. Some underwrite well and some do not.
What ADR and occupancy should I use?
Use market-specific comparables for average daily rate and a realistic full-year occupancy, then multiply ADR × 365 × occupancy. Never annualize a peak month. Model a base, upside, and downside occupancy so you can see how sensitive the return is.
Is the short-term rental 'loophole' real?
Yes, within limits. If your average guest stay is seven days or less and you materially participate, losses are non-passive and can offset ordinary income — and cost segregation with bonus depreciation can create a large first-year loss. It is a real deferral, but the accelerated depreciation is recaptured at sale, so it is not free money.
How does regulation affect the return?
Local caps on rental nights, owner-occupancy requirements, permit limits, and zoning bans can sharply cut legal operating nights or force a conversion to long-term rental. Always model the property's long-term-rental income as your downside case.
Should furnishing costs count as cash invested?
Yes. Furniture, appliances, and setup supplies are real out-of-pocket cash and belong in the denominator of your cash-on-cash calculation, alongside the down payment and closing costs.
What occupancy rate should I use for a short-term rental?
Use a realistic full-year average for your market, not a peak-season figure. Blending strong and slow months — often somewhere around 50–65% depending on location — keeps the return estimate honest.
How does leverage change a short-term rental's return?
More debt raises the return in a strong year but magnifies the downside, because the mortgage payment is fixed while nightly revenue swings with occupancy. A property that cash-flows well at 65% occupancy can turn negative at 45% purely from the debt load, so always stress-test the return at a lower occupancy and your actual loan terms.
Sources
Educational information and estimates only. Not tax advice. Tax rules change and vary by situation; consult a qualified tax professional before acting.