Simple definition
A DSCR loan is a mortgage for investment property where the lender qualifies you primarily based on the rental income the property generates, rather than relying on your personal income, W-2s, or tax returns.
DSCR stands for debt service coverage ratio. The lender divides the property's monthly rental income by the total monthly payment (principal, interest, taxes, insurance, and HOA if applicable). If that ratio meets their threshold, the deal can move forward.

