Pay Cash or Finance? It's a Decision, Not a Default

Most people don't decide whether to finance a rental — they default. One camp treats a loan as an automatic step ("of course you leverage — that's how real estate works"); the other treats debt as something to avoid ("pay cash and sleep at night"). P23 says both are wrong the same way: borrowing is a decision, not a step. It has costs and benefits that depend on the specific deal, and you make it on purpose. Here's the framework, assembled from the Financing guides you've already read.

Start by killing the false symmetry. Financing isn't free — it costs interest, carries LLPAs and reserve requirements, and (as the leverage guide showed) can drag your return when the debt costs more than the asset yields. But paying cash isn't free either: that cash had an opportunity cost — the same dollars could go to other acquisitions, investments, or reserves — and paying cash also forgoes leverage's potential amplification of equity returns when the spread is favorable. Neither choice is costless. So the question isn't "is debt bad?" — it's "does borrowing pay, on this deal, for my objective?"

P23 answers it with two current-income hurdles the money has to clear — plus your cash's opportunity cost as a separate input, not a third hurdle. The two hurdles are different bars:

• The cash-flow-spread hurdle — the loan (debt-service) constant. This is the annual loan payment as a percent of the loan (interest and principal). For borrowing to add to your current cash flow, the property's unlevered yield — its cap rate — has to beat this constant. If the cap rate is above it, positive leverage lifts your cash return; if below, financing drags it (that's the negative-leverage case from the leverage guide). This hurdle is about current cash.
• The borrowing-cost hurdle — the interest rate. This is a first-pass measure of what the borrowed money costs. It's a lower bar than the constant (interest only, no principal). Treat it as a starting point, not the whole cost: the full economic cost of the debt also includes points and LLPAs (Node 18) and depends on how long you hold the loan — and clearing or missing it still does not settle total return.

Keep one more number separate from both hurdles: your cash's opportunity cost — what those dollars could earn or do if you didn't sink them into this property. That is a different figure from the mortgage rate (people sometimes collapse the two, but the rate is what the debt costs; the opportunity cost is what your cash could earn elsewhere), and you weigh it alongside the hurdles rather than inside them. A deal can clear one hurdle and miss the other, which is exactly why this is a judgment and not a formula.

Run the canonical deal through both. Its unlevered yield is 5.5% (the cap rate). Its loan carries a 6.0% interest rate and a 7.2% debt-service constant. Line them up: 5.5% < 6.0% < 7.2%. The property's yield is below both current-income hurdles — under the interest rate and under the loan constant. So the canonical thin deal clears neither current-income financing hurdle: financing it drags current cash flow (we saw exactly this as the negative cash-on-cash and the negative leverage). Concretely, on a current-cash-flow basis the all-cash structure produces true cash flow of about $14,196 (NOI $15,516 − the $1,320 CapEx reserve, before financing and tax), while the financed structure produces about −$913. The all-cash structure therefore produces stronger current cash flow on this property. That is a negative current-income spread, not a statement that financing is inferior overall — and whether the all-cash structure is the better use of the capital is not answered here.

Current cash flow is not the only thing that matters, and this is where the honest answer gets more interesting — and where this hub hands off. Three considerations sit outside the current-income read:

• Liquidity and scale. The two structures tie up very different amounts of capital. Financing uses roughly $75,000 of cash to close, and the $210,000 loan supplies the purchase-price capital the investor would otherwise have to bring — leaving the rest of their cash free for reserves (which lenders require anyway), for other acquisitions, or for emergencies. Paying all cash commits substantially more capital to this one property. Leverage isn't just about return; it's about not tying your whole balance sheet up in a single asset.
• Total return, not just cash flow. The two hurdles above are a current-income test. They say nothing about principal paydown or appreciation, which a financed deal captures for a much smaller cash outlay — an equity-return effect. Whether the total return favors financing is a real question — but it's a Wealth question (ROE, the wealth engines), and this hub deliberately doesn't answer it. Don't let a current-cash-flow verdict masquerade as a total-return verdict.
• Risk tolerance. Debt amplifies both directions and adds a payment you must make in bad months. During a vacancy the leveraged owner still owes the full debt service with no rent coming in; the all-cash owner has no such payment to cover. That's a real, personal input, not a number.

So the honest verdict on "cash or finance?" is the same shape as the "does it pencil?" decision: it depends on your objective. For this thin canonical deal judged purely on current cash flow, the all-cash structure produces the stronger result — the yield clears neither hurdle. For an investor optimizing liquidity, scale, or total return, financing can still be the better call despite the negative current-income spread, because it preserves liquidity that may enable a larger portfolio and greater optionality — a case that has to be made in the Wealth guides, not here. What you don't do is treat either one as automatic.

So the plain-English version: don't default — decide. Put the money to the two current-income hurdles (does the yield beat the loan constant? beat the interest rate?), keep your cash's opportunity cost in view as a separate input, then weigh liquidity, scale, total return, and your own risk tolerance against your actual objective. The canonical deal clears neither hurdle, so on current cash flow the all-cash structure is stronger; whether financing wins on the bigger picture is a Wealth question. Borrowing is a decision, not a step — so make it.

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The bottom line

Whether to pay cash or finance a rental is a decision, not a default. Put the money to two current-income hurdles — the loan constant (cash-flow spread) and the interest rate (borrowing cost) — keep your cash's opportunity cost in view as a separate input, then weigh liquidity, scale, total return, and your own tolerance for debt against what you're trying to do. The canonical deal clears neither hurdle, so on current cash flow the all-cash structure produces the stronger result (~$14,196 vs. −$913); whether financing wins on scale or total return is a Wealth question, not this one. Borrowing is a decision, not a step — so make it on purpose.

About the author

Matt Nunn is the founder of Builders Finance. He has spent two decades working with the financial side of real estate businesses, and started Builders Finance to give short-term-rental operators the financial systems, frameworks, and plain-language education that most hosting advice skips over. Builders Finance publishes educational content for STR owners; it is not legal, tax, or investment advice, treatment depends on your facts and circumstances, and it is not a substitute for guidance from your own qualified professionals.

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This resource provides general educational information and is not individualized investment or lending advice. The cash-vs-finance decision depends on your yields, costs, liquidity, and objectives; decide for your own situation.

Primary sources / provenance: BFC Financing P23 (borrowing is a decision, not a step; two current-income hurdles — the loan/debt-service constant as the cash-flow-spread hurdle and the interest rate as the borrowing-cost hurdle, plus the investor's cash opportunity cost as a separate input). Note: the deployed registry currently labels hurdle (2) the "economic hurdle"; this node flags a recommended P23 wording amendment to "borrowing-cost hurdle" (governance ruling not made here). Assembles Node 15 (leverage), Node 18 (pricing/reserves), and the canonical metrics (cap 5.5%, rate 6.0%, constant 7.2%; all-cash true CF ~$14,196 vs. financed −$913); routes total return to Wealth. Canonical figures from the locked assumptions/roll-forward; a specific investor's rate/liquidity/objective are their own.