Should I Pay Cash or Finance My STR?

The question, in plain terms

Should you buy this short-term rental with cash or finance it? The answer really is "it depends," but it depends on things you can actually measure, not on a rule of thumb about leverage. This guide turns "it depends" into a short list of questions you can answer for your deal.

Most advice gives you one of two reflexes: "always leverage — that's how you build wealth," or "debt is risk — pay cash if you can." Both are sometimes right and often wrong, because they skip the actual analysis. The real decision starts with one check: does the property earn enough to cover its own debt? If it doesn't, financing it on the proposed terms fails the coverage floor (set out in the recommendation below), and the answers to the other questions don't change that. If it does, the decision comes down to three questions:

• Does debt add to or subtract from your return on this specific property?
• What else could your cash do if you didn't sink it into the purchase?
• How much safety are you buying or giving up?

Work through those three and the answer becomes clear: sometimes it points to cash, sometimes to financing, and either way the reasoning is yours to defend.

Factor 1: the spread — does debt add or subtract here?

Start with what the debt does to the return on this property, which comes down to one subtraction: the property's cap rate minus the loan's constant. Cap rate is the property's yearly NOI divided by its price. The loan constant is a year's loan payments as a share of the original loan amount. This is the leverage test from How Debt Changes the Economics of an STR, and it's the first of the three factors to run.

If the property's cap rate is above the loan constant, the modeled leverage spread is positive: debt can increase the return on the equity you leave in the deal. That makes financing more attractive on return. But a positive spread tells you the direction of the effect, not how much debt to take, because more leverage also raises your fixed payment, your break-even, and your downside. If the cap rate is below the constant, the spread is negative and leverage drags your return down: each borrowed dollar takes more in yearly loan payments than it earns in the property.

Take the example deal these guides use, an illustration rather than a forecast, whose full assumption set is listed in The Assumptions Behind Every Model. Its cap rate is 4.05% on NOI after a management allowance (6.23% before it) and its loan constant about 8.0%, so the spread is negative: −3.9 points after the allowance, and −1.8 even before it. The management allowance is a market management fee, counted even if you manage the property yourself. Financed, its cash-on-cash return (the year's cash flow as a share of the cash you put in) falls from about 1.8% all-cash to about −11.4%. On spread alone, this deal says pay cash.

But spread alone doesn't end the decision — because paying cash has a cost of its own, and that's the next factor.

Factor 2: opportunity cost — what else could the cash do?

Paying cash isn't free: it locks up capital that could be earning elsewhere. Financing frees that capital, and if it can earn more than the spread costs you, financing can be the right call even on a negative-spread deal, once the property covers its own debt. This is the factor the "just pay cash" camp skips.

Here's that cost in concrete terms. It comes as two hurdles worth keeping separate, because collapsing them into one number is where most analysis goes wrong. On the example deal, financing instead of paying cash preserves about $487,500 of capital (you put in $227,000 rather than $714,500). Keeping that capital free costs you roughly $38,920 a year in debt service, so the first hurdle, the cash-flow hurdle, is that payment divided by the preserved capital: about 8%, essentially the loan constant. That's what the freed $487,500 would have to earn in cash each year just to replace the mortgage's cash outflow. It's a liquidity question.

But that 8% overstates the loan's real cost, because part of every payment is principal, and principal doesn't vanish. It pays down your loan and becomes your equity: cash moving from one pocket to another, not an expense. Take it out and you're left with the loan's true economic cost, which is mostly the interest: roughly the note rate (the loan's stated interest rate), about 7% here, and lower still after the interest deduction. That gives you the second, lower hurdle.

The example deal makes this comparison unusually clean. The capital financing frees ($487,500) is almost exactly the loan itself, so the wealth comparison is direct: you're investing ~$487,500 elsewhere while paying ~7% interest on ~$487,500. Financing builds more wealth than paying cash whenever the freed capital reliably beats that economic hurdle (≈ the interest rate), even though the spread is negative; below it, cash wins. That comparison only counts once the property covers its own debt, and on this deal it doesn't: the coverage floor, below, settles it first.

So use both, for different questions. The cash-flow hurdle (~8%) asks whether the freed capital can cover the payment: can you carry it? The economic hurdle (≈ the interest rate) asks whether financing actually makes you wealthier. For that, the freed capital only has to beat the loan's real cost, not the full payment. (Taxes and liquidity sit on top of this and are taken up next.)

Factor 3: liquidity and risk — how much safety are you buying?

Beyond the math, cash and debt buy different kinds of safety, and the right answer depends on which you value more. This is where the decision stops being purely arithmetic.

Paying cash buys resilience. With no mortgage, the property's break-even occupancy drops dramatically, so it can weather a brutal season without threatening you. On the example deal, with management at 22% and the capital reserve (money set aside each year for major replacements) funded as a fixed cost, break-even falls from 98.4% financed to 43.5% debt-free. There's no fixed payment due in the empty months, no risk of a loan resetting to a higher payment, no lender.

Financing buys the opposite kind of safety: liquidity. Your cash stays available for emergencies, opportunities, and reserves rather than being locked in a single illiquid asset, and it lets you spread the same capital across more properties instead of concentrating it in one. The trade is real and personal: cash lowers this deal's risk; financing lowers your concentration risk and keeps you flexible, at the price of a payment that lands every month regardless of the season. How Loan Structure Interacts With Seasonal STR Cash Flow shows how to size a reserve for the slow months. (One modest point in financing's favor: mortgage interest on a rental is generally deductible against rental income, a small after-tax offset to the cost. Treat it as a footnote, not a driver, and confirm with your CPA.)

The recommendation: how to actually decide

Check the coverage floor first, then work the three factors in order and let them point you: cash when the spread is negative, your capital has no better use, and you want the safety; financing when the spread is positive, or the freed capital earns more elsewhere, or you need the liquidity and can carry the payment. Among the three factors, no single input decides it; the combination does. But the floor comes first. It's a planning test these guides use, not the DSCR a lender calculates to approve a loan: if the property's analytical DSCR (NOI after a management allowance ÷ debt service) is at or below 1.00, financing fails it, and no return on the freed capital turns that into a healthy financed deal. On the example deal, analytical DSCR is about 0.68, so financing it on these terms fails the floor. The answer is cash, a smaller loan the property can carry, or a deliberate exception: financing it anyway as a portfolio decision, with adequate liquidity, a stated strategic reason and a clear acknowledgment that the property doesn't support its own debt.

Once the floor clears, run the spread: if it's clearly positive, financing is likely your answer and the rest confirms it. If it's negative, as on many high-price STR deals today, don't stop there. Ask what the freed capital would genuinely earn in your hands, and hold it to the two hurdles. If it can reliably beat the loan's economic cost (roughly the interest rate), financing can still build more wealth despite the negative spread; if it would just sit, paying cash to capture the debt-free return and the lower break-even is the stronger move. Then check the cash-flow side: can that freed capital, or your reserves, actually carry the payment through the year? Finally, factor in liquidity and risk. If paying cash would leave you thin on reserves, that argues for financing even at a cost; if you value riding out a bad season with no lender, that argues for cash. The point is to make sure you weigh all three factors rather than defaulting to one.