Conventional investment lending eventually stops working for people who are good at it. Every mortgage you take counts against your debt-to-income ratio whether the property covers it or not, Fannie Mae’s Selling Guide caps a borrower at ten financed properties, and a schedule of depreciation that is doing exactly what your accountant intended makes your tax return look like a smaller income than you have. DSCR lending exists because underwriting the borrower is the wrong question when the borrower is not the one paying the mortgage.
The ratio, and nothing else
DSCR is debt service coverage ratio:
DSCR = gross monthly rent ÷ PITIA
PITIA is the full monthly obligation — principal, interest, taxes, insurance and any association dues. Not the principal-and-interest figure a rate sheet quotes. Above 1.00 the property covers itself; below 1.00 it does not and the shortfall comes out of your pocket.
That is the entire qualifying test. No tax returns, no W-2s, no employment verification, no personal debt-to-income calculation. The lender still checks your credit, your reserves and your experience, and it will want a personal guarantee — but the yes or no comes from the property.
Worked, on one purchase
A $340,000 single-family rental, 25% down ($85,000), $255,000 borrowed over 30 years at a placeholder 7.75%. That rate is a starting number, not a quote; investor pricing carries a spread over owner-occupied pricing and this site publishes no rates.
- Principal and interest: $1,826.85
- Property tax at 1.25% of value: $354.17
- Insurance at $1,500 a year: $125.00
- HOA: none
- PITIA: $2,306.02
Now put three rents against it:
- $2,500 a month → DSCR 1.08. The property covers itself with $194 a month to spare. Most programmes will lend, and not at their best pricing.
- $2,800 a month → DSCR 1.21. Comfortably financeable and close to where the better tiers start.
- $3,100 a month → DSCR 1.34. Strong.
To clear a 1.25 threshold on this purchase the property must produce $2,882.52 a month. If market rent is $2,650, no amount of enthusiasm closes that gap — but $20,000 more down payment does, by cutting the payment rather than raising the rent. That is the lever DSCR underwriting actually gives you, and it is worth modelling before you make the offer. Build the PITIA on the payment calculator and divide.
What you are giving up
A DSCR loan is a non-QM loan. It sits outside the Qualified Mortgage definition in Regulation Z (12 CFR 1026.43), and that is a substantive difference rather than a labelling one. Three consequences matter:
Prepayment penalties are permitted, and normal. QM rules restrict them severely on owner-occupied loans. On a DSCR loan a stepped penalty across the first three to five years is common. If your model is buy, renovate, season, refinance, price that clause first — it can outweigh every rate you shopped.
The ability-to-repay presumption does not apply the same way. The consumer protections built around QM loans were written for owner-occupied borrowing. Investment lending is a commercial transaction and is treated as one.
Terms vary by lender in ways agency lending does not. There is no Fannie Mae rulebook behind DSCR. Ratio floors, reserve requirements, minimum loan sizes, permitted entity structures, short-term-rental treatment and interest-only options differ from one programme to the next, and the same property can get materially different answers from three lenders in one week. Shop it.
Beyond that: expect a larger down payment than a conventional investment loan, a rate above agency pricing, and reserves measured in months of PITIA.
Where DSCR fits, and where it does not
It fits when the tax return understates you, when your debt-to-income ratio is full of performing rentals, when you are past the financed-property cap, when speed matters more than the last quarter-point, or when the purchase belongs in an LLC for reasons that have nothing to do with the loan.
It does not fit when you would qualify conventionally without strain. If the ratios work, the agency loan is normally cheaper and carries no prepayment penalty. Nobody should pay non-QM pricing for a file that a conventional underwriter would have approved.
It also does not fit a property whose numbers only work on assumptions. Underwriting to the appraiser’s Form 1007 market rent rather than to a spreadsheet’s projected rent is a discipline worth keeping even where the lender is relaxed about it.
Reading the deal properly
Four numbers decide whether a DSCR loan is a good one, and only the first is on the rate sheet:
- The rate, which sets the payment and therefore the ratio.
- The points, which are a cash cost with a break-even measured in months — the same calculation as any buy-down. Run it against how long you will hold the loan, not against the term.
- The prepayment penalty schedule, priced against your actual exit plan.
- What the balance looks like at your exit. An interest-only period keeps the ratio healthy and builds no equity; the amortisation schedule shows exactly what the balance will be in the year you intend to sell or refinance.
The programme is a genuinely useful tool for people whose finances have outgrown a W-2 underwriting box. It earns its keep by asking a better question than “what does your tax return say”. It just happens to ask that question in a market with fewer rules in it, so read the note before you sign it.