One ratio, two different numerators
DSCR always answers the same question: does the cash coming in cover the debt payments going out? The formula never changes.
DSCR = Cash available for debt service ÷ Total debt service for the same period
What changes is whose cash sits on top. In business lending, the numerator is the operating cash flow of the company — usually net income with interest, depreciation, amortization, and non-recurring owner expenses added back. In commercial real estate, the numerator is the net operating income of a single property: rent collected minus operating expenses, before any mortgage payment.
That difference matters more than it sounds. A business DSCR judges a company. A property DSCR judges a building — the owner's other businesses, salary, and personal debts sit outside the calculation entirely. Two underwriters can look at the same borrower and produce completely different ratios because they are measuring different things. Run both versions in the DSCR calculator before you assume which one applies to you.
Worked example: DSCR on business cash flow
A distribution company generates $108,000 of annual cash flow available for debt service. It wants a $250,000 term loan at 10.5% over five years, and it already carries an equipment loan at $2,400 a month.
- Cash available for debt service — $108,000
- Existing equipment loan — $2,400 × 12 = $28,800
- New term loan payment — $5,373 × 12 = $64,482
- Total annual debt service — $93,282
$108,000 ÷ $93,282 = 1.16. Against a 1.25 floor, that is a decline — and the decline has nothing to do with credit, revenue, or the owner. It is arithmetic, which means it is fixable. Retiring the equipment loan first lifts the ratio to 1.67. Dropping the request to $200,000 lifts it to 1.34. Stretching the same $250,000 over seven years instead of five lifts it to 1.36 without reducing the amount funded at all.
Worked example: DSCR on property NOI
A small apartment building produces $180,000 of NOI. The buyer asks for $2,000,000 at 6.75% on a 25-year amortization.
- Net operating income — $180,000
- Monthly principal and interest — $13,818
- Annual debt service — $165,819
$180,000 ÷ $165,819 = 1.09. Under a 1.25 minimum the loan simply does not size to $2,000,000. Run the math backwards instead: the most debt service this property supports is $180,000 ÷ 1.25 = $144,000 a year, which at that rate and amortization funds roughly $1,736,800 — about $263,000 less than requested. That gap gets filled with equity, a seller note, or a lower purchase price.
Notice what never entered the calculation: the borrower. This is why property DSCR always travels with two companions. At $1,736,800 the debt yield rises from 9.0% to 10.4%, and the loan constant of 8.29% tells you whether borrowing more helps or hurts your return.
What it means for you
DSCR is the most common reason a deal shrinks rather than dies. Most borrowers hear "declined" and stop. In practice the underwriter has just told you the size of loan your cash flow supports, and the remaining negotiation is about term length, existing debt, and which add-backs count.
So calculate your own ratio twice before you apply: once at the amount you want, once one step down. If the first fails the floor and the second clears it, you already know what to ask for. When you compare business loan options, ask every lender two questions — what is your minimum DSCR, and how do you define the cash flow on top? The second answer matters as much as the first.
What to watch for
- Every lender defines the numerator differently. Some use EBITDA, some use net income plus depreciation, some subtract a market-rate owner salary, some subtract distributions and capital expenditures. A 1.30 at one lender can be a 1.05 at the next on identical financials.
- Global DSCR pulls in your personal debts. Many bank and SBA lenders calculate a global ratio that adds the owner's home mortgage, car loans, and other personally guaranteed business debt to the denominator. Ask up front whether the test is business-only or global.
- An outstanding cash advance can quietly break the test. Daily and weekly remittances are not amortizing debt, so they may not land in the denominator cleanly — but they absolutely reduce the cash sitting in the numerator.
- Pro forma NOI is not NOI. A property DSCR built on projected rents after renovation rarely survives underwriting. Expect the ratio to be rebuilt on trailing twelve-month actuals.
- Longer amortization improves the ratio and increases total interest. Stretching the term to pass a DSCR test is legitimate, but price what the extra years cost before you use it as the fix.
What is a good DSCR for a business loan?
Most conventional business lenders look for at least 1.20 to 1.25, and SBA lenders commonly work to a similar floor calculated on a global basis. A ratio of exactly 1.00 means every dollar of cash flow is already committed to debt with nothing left for a slow quarter, so underwriters generally treat 1.00 as a decline rather than a pass.
How do I calculate DSCR for a commercial property?
Divide the property's net operating income by the annual principal and interest on the proposed loan. NOI is collected rent minus operating expenses — taxes, insurance, management, maintenance, and reserves — but never the mortgage payment itself. A property producing $180,000 of NOI against $165,819 of annual debt service has a DSCR of 1.09.
Can I still get funded with a DSCR below 1.25?
Often, but at a smaller amount. The realistic paths are borrowing less, extending the amortization, paying off an existing loan first, or adding a co-borrower whose cash flow counts. Some bridge and short-term products will underwrite below 1.00 against a stabilization plan, and they price that risk accordingly.
