A DSCR loan is an investor mortgage that qualifies on the property's rental income instead of your personal income. The lender divides the property's expected rent by its debt payment, and if that ratio clears their threshold, your W-2, tax returns, and debt-to-income picture mostly stop mattering.
In practice
The number a DSCR lender runs is the debt service coverage ratio: monthly rent divided by the monthly debt payment, where the debt payment is usually principal, interest, taxes, and insurance combined. Say you are buying a duplex that rents for $2,800 a month, and the loan you are quoted carries a $2,240 monthly payment once taxes and insurance are folded in. The ratio is $2,800 ÷ $2,240, which works out to 1.25. A property at 1.25 throws off 25 percent more income than it needs to cover the note, and most lenders treat anything at or above 1.0 as cash-flowing, with stronger pricing as the ratio climbs. Drop the rent to $2,100 against that same payment and the ratio falls to roughly 0.94, meaning the rent no longer covers the debt on paper, and the deal either gets repriced, needs more money down, or gets declined.
Why it matters to a small landlord
DSCR financing exists because conventional underwriting counts your personal debts and caps how many financed properties you can hold. Once you are self-employed, or holding several mortgages, or writing off enough on Schedule E that your tax returns understate your cash flow, qualifying on the property itself can be the path that stays open. The trade is real: rates and fees usually run higher than an owner-occupied loan, and the lender leans hard on the appraised rent, so a soft rent estimate can sink an otherwise sound purchase. If you are weighing it against other structures, the comparison in conventional vs DSCR vs portfolio loans lays out where each one wins. Before you ever apply, know the property's real rent and its real expenses cold, because the loan is only as honest as those two numbers.
DSCR sits next to a few terms worth knowing together. Lenders pair the ratio with a loan-to-value limit that decides your down payment, and many investors first reach for a DSCR product on a cash-out refinance to pull equity out of a property that already cash-flows. Get the rent and the coverage ratio right, and the rest of the file tends to follow.