DSCR (偿债备付率) 商业地产贷款完全指南

DSCR measures whether a property earns enough to pay its mortgage. It compares the property's net operating income (NOI) with its annual debt service — the total principal and interest payments due on the loan over a year.

DSCR = Net Operating Income ÷ Annual Debt Service

A DSCR of 1.25x means the property produces $1.25 of operating income for every $1.00 of loan payments. A DSCR of 1.00x means the property earns exactly enough to cover the mortgage, with nothing left over. Below 1.00x, the property does not earn enough from operations to pay its own loan.

Two inputs matter, and both are easy to get wrong:

• Net operating income (NOI) is the property's income after operating expenses — property taxes, insurance, maintenance, management, and utilities — but before mortgage payments, income tax, and depreciation. It is not gross rent. If you are unsure how NOI is built, start with our NOI calculator.
• Annual debt service is the full year's mortgage payments: principal plus interest. If your loan has a monthly payment, multiply it by 12. Do not use a monthly payment against annual income, or the ratio will look twelve times better than it is.

Lenders care about DSCR because it is a cushion. If a tenant leaves, a roof needs replacing, or rents soften, the cushion is what keeps the loan payments coming. The bigger the cushion, the safer the loan looks to the lender.

Take a 20-unit apartment building. Here is the calculation, step by step.

Step 1: Gross potential rental income. 20 units × $1,500 per month × 12 months = $360,000 per year.

Step 2: Subtract a vacancy allowance. Not every unit is full every month. At a 5% vacancy allowance: $360,000 × 5% = $18,000. Effective gross income is $360,000 − $18,000 = $342,000.

Step 3: Subtract operating expenses. Suppose annual operating expenses total $92,000: property tax $28,000, insurance $12,000, maintenance and repairs $18,000, property management $20,000, and utilities $14,000.

Step 4: Net operating income. $342,000 − $92,000 = $250,000 NOI.

Step 5: Annual debt service. The loan requires $15,000 a month, so annual debt service is $15,000 × 12 = $180,000.

Step 6: Divide. DSCR = $250,000 ÷ $180,000 = 1.39x.

That means the building produces $1.39 of operating income for every $1.00 of loan payments, leaving a $70,000 annual cushion ($250,000 − $180,000) before the mortgage is at risk.

Two quick sensitivity checks show why the cushion matters. If NOI fell 10% — say a few units sat empty — NOI would drop to $225,000, and DSCR would fall to $225,000 ÷ $180,000 = 1.25x, right at the threshold many agency multifamily lenders require. And working backwards: if a lender required 1.25x, the most debt service this property could support would be $250,000 ÷ 1.25 = $200,000 a year. The current $180,000 passes with $20,000 of headroom.

Try your own numbers with our DSCR calculator — it runs the same calculation and shows how the ratio changes as income, expenses, or loan terms move.

There is no single required DSCR. The minimum depends on the property type, the lender, the market, and the strength of the borrower. But the ranges below are the ones lenders commonly work with for stabilized properties, and they are a good starting point for any first deal.

Multifamily has the lowest floor because its income is spread across many units and demand is relatively steady. Office and hotels sit at the top because their income is more volatile — office leases roll over in large blocks, and hotel income can swing with the season and the economy.

A few program benchmarks worth knowing:

• Agency multifamily (Fannie Mae / Freddie Mac): Fannie Mae's conventional multifamily term sheets list a minimum DSCR of 1.25x. That is why 1.25x is the number you will hear most often in apartment deals.
• Agency affordable-housing and green programs: published program summaries put these lower, around 1.15x–1.20x, in exchange for affordability or efficiency commitments.
• SBA 504 and 7(a) loans: for owner-occupied commercial property, lender guidance typically points to a minimum DSCR of around 1.15x–1.25x, depending on the lender and the borrower's overall financial picture.

Treat every number above as a typical range, not a guarantee. A strong sponsor with a long track record can sometimes borrow at a lower DSCR; a weak market, a single-tenant property, or a loan with near-term lease expirations can push the requirement higher. The only number that matters for your deal is the one your lender quotes — confirm it before you go under contract.

Knowing the formula is not the same as knowing how a lender applies it. Four things surprise first-time borrowers:

Lenders use their own NOI, not the seller's. The seller's numbers are a starting point. An underwriter will strip out one-time income, apply a market vacancy rate instead of the seller's optimistic one, add a management fee even if you plan to self-manage, and deduct replacement reserves for roofs, appliances, and other capital items. The lender's NOI is almost always lower than the seller's — and the DSCR they calculate is lower too. Expect the gap and underwrite to the lender's version, not the marketing package.

DSCR and LTV are tested together. A property can pass the loan-to-value test and still fail on cash flow. Lenders size the loan to whichever test produces the smaller number. If the value supports a $2.5 million loan but the DSCR only supports $2.2 million, the loan is $2.2 million.

Some lenders stress-test the ratio. Instead of today's rate and occupancy, they may test DSCR at a higher interest rate, a higher vacancy rate, or both. A deal that passes at 1.30x today but only 1.10x under stress may still get a smaller loan or a higher rate.

DSCR is often a loan covenant, not just an approval test. Many commercial mortgages require the borrower to maintain DSCR above a threshold — often 1.20x or 1.25x — tested quarterly for the life of the loan. Falling below it can be a technical default even if every payment was made on time, and can let the lender freeze distributions or demand a paydown. Check the covenant language before you sign, not after.

One more caution: interest-only periods make DSCR look better than it is, because the payment is lower while no principal is being repaid. Agency guidance generally requires DSCR to be calculated on the fully amortizing payment even during an interest-only period. If a deal only works on interest-only payments, it does not really work.

DSCR has only three levers: raise income, cut expenses, or reduce the debt service. Using the apartment building from the worked example — NOI $250,000, debt service $180,000, DSCR 1.39x — here is what each lever does.

Raise the income. A $150-per-month rent increase across all 20 units adds $36,000 a year to gross income. After the 5% vacancy allowance, NOI rises by about $34,200, to roughly $284,000. DSCR becomes $284,200 ÷ $180,000 = 1.58x. Rent increases are the most powerful lever, but only if the market supports them — check comparable rents before assuming the increase sticks, and remember a lender will want to see the higher rents actually collected before crediting them.

Cut operating expenses. Reducing expenses by $12,000 a year — renegotiating insurance, cutting a wasteful service contract, fixing a leak that was driving up water bills — raises NOI to $262,000. DSCR becomes $262,000 ÷ $180,000 = 1.46x. Expense cuts work immediately, but do not cut maintenance that protects the building's value; deferred maintenance shows up later as capital spending or lower rents.

Reduce the debt service. A larger down payment means a smaller loan and a smaller payment. A longer amortization schedule spreads the same loan over more years and lowers the annual payment. Refinancing to a lower rate does the same. For example, if the monthly payment fell from $15,000 to $13,500, annual debt service would drop to $162,000, and DSCR would rise to $250,000 ÷ $162,000 = 1.54x. The trade-off is real: longer amortization means slower equity build-up and more total interest paid, so weigh the higher DSCR against the long-term cost.

The honest version of "improving DSCR" is improving the property or the loan — not reworking the spreadsheet. Lenders underwrite to their own income assumptions, so a DSCR that only exists in your model will not survive their review.

First-time buyers make the same errors again and again. Avoid these six:

1. Using gross income instead of NOI. Gross rent is not what services the loan. Subtract vacancy and operating expenses first, or the ratio is meaningless.
2. Forgetting replacement reserves. Roofs, HVAC systems, and appliances wear out. Many lenders deduct a reserve — often a set amount per unit per year — before calculating NOI. A deal that ignores reserves overstates DSCR.
3. Trusting the seller's pro forma. Seller projections assume full occupancy, no surprises, and the cheapest possible expenses. Underwrite to the trailing twelve months of actuals, then adjust for what you can verify.
4. Mixing monthly and annual figures. The most common arithmetic error in DSCR is dividing annual NOI by a monthly payment. Keep both sides of the formula annual.
5. Ignoring the balloon payment. Many commercial loans amortize over 25 or 30 years but come due in 5, 7, or 10 years. DSCR tells you whether you can make the monthly payments — it says nothing about whether you can refinance or repay the balloon when it comes due. Check the exit, not just the coverage.
6. Treating 1.25x as a universal pass mark. It is a common floor for stabilized multifamily, not a rule for every property type, lender, or market. Office, retail, and hotels typically need more, and any lender can ask for more on a specific deal.

DSCR is one of several ratios lenders watch, and it answers a different question from each of the others:

• Loan-to-value (LTV) asks how much of the property's value is borrowed. It is about the collateral; DSCR is about the cash flow.
• Debt yield (NOI divided by the loan amount) is another cash-flow test, and some lenders prefer it because it does not depend on the interest rate or amortization schedule.
• Cash-on-cash return measures the return on your equity — the cash left after debt service, divided by the cash you invested. DSCR tells you whether the loan is safe; cash-on-cash tells you whether the deal is worth it to you.

A good deal usually passes all of them. A deal that passes DSCR but fails debt yield, or passes LTV but fails DSCR, is a deal to look at more closely before committing.