DSCR Explained
the one ratio commercial lenders actually care about.

The Definition

DSCR is net operating income divided by annual debt service:

DSCR = NOI ÷ Annual Debt Service

NOI is the property's income after operating expenses but before the mortgage payment, taxes, and depreciation. Annual debt service is the total of twelve monthly principal-and-interest payments. A DSCR of 1.00x means the property exactly breaks even. Anything above 1.00x means there's cushion; anything below means the owner has to feed the property out of pocket.

Why 1.25x Is the Magic Number

Most commercial lenders require a minimum DSCR of 1.20x to 1.25x at origination. The logic: if rents drop 20%, the property still covers the mortgage. Stricter products want 1.30x or higher; aggressive lenders go to 1.15x. Multifamily and stabilized retail typically sit at 1.25x. Hotels, restaurants, and self-storage — anything with volatile cash flow — get pushed to 1.40x or above.

If your underwriter says the deal "doesn't pencil," they almost always mean DSCR came in below their threshold.

A Worked Example

Six-unit apartment building. Gross rents $96,000/year. Vacancy and credit loss 5% ($4,800). Operating expenses (taxes, insurance, maintenance, management, utilities) $32,000.

• Effective gross income: $96,000 − $4,800 = $91,200
• NOI: $91,200 − $32,000 = $59,200
• Loan: $600,000 at 7.25%, 25-year amortization → annual debt service ≈ $52,040
• DSCR: $59,200 ÷ $52,040 = 1.14x

That deal fails a 1.25x test. Either the loan size has to come down, the rate has to come down, or the income has to go up.

The Three Levers

1. Loan size. The fastest fix. Drop the loan from $600k to $545k and DSCR jumps to 1.25x at the same rate. This is why "lower the LTV" and "raise the DSCR" are often the same conversation.
2. Amortization term. Stretching from 20-year to 30-year amortization lowers the monthly payment by 15–20%. Some commercial lenders allow this, most don't — bank loans cap at 25 years on income property.
3. NOI. Either raise rents toward market, or strip operating expenses. Underwriters won't credit "pro forma" rents that haven't actually been collected — they use trailing 12-month actuals or a market rent study.

Global vs. Property-Level DSCR

Some lenders calculate global DSCR — combining the subject property's NOI with the borrower's personal income and other property cash flows, divided by all debt service. This helps when one property runs thin but the borrower has a strong portfolio. Others insist on property-level DSCR only, treating each loan as if it had to stand alone. Ask which method the lender uses before you submit; it changes which deals are viable.

DSCR Loans (No-Doc Investor Loans)

"DSCR loans" — sometimes called investor cash-flow loans — are a non-QM product where the lender qualifies the property based on rent vs. payment, not the borrower's tax returns. They typically want DSCR ≥ 1.00x or 1.10x, charge 0.5–1.5% above conventional investor rates, and cap at 75–80% LTV. Useful for investors who write off enough on their personal returns to look "broke" on paper.

Common Mistakes

• Forgetting reserves. Some lenders pull replacement reserves (typically 3–5% of gross income) out of NOI before computing DSCR. That haircut sinks borderline deals.
• Using debt service before taxes and insurance. If the loan is escrowed, T&I are part of the monthly payment but not part of debt service for DSCR. Don't double-count them as expenses too.
• Trusting the broker's NOI. Listing-broker pro formas habitually understate management, vacancy, and capex. Underwrite with realistic numbers before you fall in love.

Sources

Fannie Mae Multifamily Selling and Servicing Guide; SBA SOP 50 10 7.1; OCC Comptroller's Handbook on Commercial Real Estate Lending.