sfrcalc.comCash vs. Financing: How Purchase Type Changes Your Return
Every calculator on this site has a Cash / Financed toggle above the down payment field. It looks like a small setting, but it changes almost every number below it — not because the property changed, but because the two purchase types measure return in fundamentally different ways.
What actually changes when you switch to Cash
Paying cash removes the mortgage payment entirely. No interest, no principal, no lender fees. That has two effects that pull in opposite directions:
- Monthly cash flow goes up — sometimes dramatically — because there's no debt service eating into rental income.
- Cash-on-cash return usually goes down — because you're now measuring that higher cash flow against the full purchase price instead of a down payment, and the denominator grew by far more than the numerator did.
| Purchase price | $250,000 |
| Financed (20% down): monthly cash flow | $185 |
| Financed: cash invested | $58,000 |
| Financed: cash-on-cash return | 3.8% |
| Cash: monthly cash flow | $1,240 |
| Cash: cash invested | $253,500 |
| Cash: cash-on-cash return | 5.9% |
In this example cash-on-cash return actually went up when paying cash — that won't always be true, and it depends on how favorable the financing terms are. Leverage cuts both ways: cheap debt on a strong deal usually boosts cash-on-cash return above what cash alone would produce, but expensive debt (or a thin spread between rent and the mortgage payment) can drag it below the cash scenario, like the example above.
What doesn't change
Cap rate stays identical either way. Cap rate is NOI divided by purchase price, and NOI is calculated before debt service — financing was never part of the formula. If you toggle Cash vs. Financed on any calculator here and watch cap rate hold steady while everything else moves, that's expected, not a bug. It's a useful way to see the difference between the two metrics on a live number instead of an abstract explanation.
Why an investor would choose either one
Financing
Ties up less capital per property, so the same cash can be spread across more deals. Magnifies both the upside and the downside of a deal's performance. Adds payment risk if rates reset or income drops.
Cash
No mortgage payment, no refinance risk, simpler underwriting. Ties up significantly more capital per property and caps how many deals the same pool of cash can reach. Often used for a fast close, then refinanced later (see BRRRR).
Neither is universally correct. An investor optimizing for portfolio growth on limited capital usually leans toward financing, accepting more leverage risk to control more doors. An investor optimizing for simplicity, or buying in a market where financing terms are unfavorable, may prefer cash — sometimes with a plan to refinance later once the property is stabilized, which is effectively the BRRRR model.