What the ratio measures
DSCR stands for debt service coverage ratio, and it asks one question: does the property produce enough rent to cover what it costs to carry? Divide the rent by the payment and you have it. A result above 1.0 means the property covers itself with room to spare; below 1.0 means it doesn’t, and the file needs something else to work.
That’s the whole concept. What makes DSCR useful to an investor is what it leaves out, your job, your tax returns, your personal debt-to-income. The property is the borrower, in effect.