Debt service coverage ratio (DSCR): what it is and how lenders use it

The formula, and what goes on each side

DSCR = cash flow available for debt service ÷ debt service. Both sides cover the same period, usually a fiscal year or the trailing twelve months. A ratio above 1 means the business generated more cash than its loan payments required; below 1, it did not, and the difference came from somewhere else: cash on hand, the owners, or more borrowing.

The numerator starts from earnings. Most lenders begin with EBITDA (earnings before interest, taxes, depreciation and amortization), then adjust:

• Add documented one-time and discretionary expenses: see EBITDA add-backs.
• Subtract a market salary for the owner if the owner's pay was added back, or if a buyer will need to hire a manager.
• Often subtract cash taxes, capital spending not funded by other debt, and distributions to owners. Once all three come out, the measure starts to look like a fixed charge coverage ratio.

The denominator is every scheduled payment of principal and interest over the period: the proposed loan, existing term debt, equipment loans and finance leases, interest on the line of credit, and any seller note that is being paid. A seller note on full standby receives nothing, so it is left out. A balloon due at maturity is not counted as a year's debt service; it is a refinancing question, handled separately.

A worked example

A business reports EBITDA of 1,100. It has documented add-backs of 150: a one-time legal settlement and the part of the owner's pay above a market salary. Adjusted EBITDA is 1,250. Its existing equipment loan costs 300 a year, and the proposed new term loan would cost 700 a year in principal and interest.

As presented, the business sits exactly at 1.25x. If the lender will not credit 100 of the add-backs because they cannot be traced to the books, coverage falls to 1.15 and the loan as proposed no longer fits the lender's minimum, whether that is a bank's 1.25x or the 1.25x SBA requires of a change of ownership from 1 October 2026. The lender's answer is usually not a flat no but a smaller loan: at 1.25x, cash flow of 1,150 supports total debt service of 920, so the new loan's payment must fall from 700 to 620.

At a 1.25x minimum, every 1 of cash flow the lender does not credit removes 0.8 of annual payment capacity, and with it a multiple of that in loan size.

How lenders actually calculate it

Historic, then pro forma. A lender first measures coverage on actual results: the last full fiscal year, and often the trailing twelve months if the year-to-date figures are materially different. It then adds the proposed loan's payments to the existing debt service and recomputes. The pro forma ratio, on historic cash flow, is what sizes the loan. Projections matter to the story; banks and SBA lenders generally will not size a loan on earnings the business has not yet produced.

The payment is the amortizing payment. If a loan has an interest-only period, lenders usually underwrite the payment once amortization begins. On a variable-rate loan, some lenders also test coverage at a higher rate than today's to see how much room there is.

SBA lenders add a global view. On an SBA loan, the lender looks at the business's coverage and at global cash flow: the business together with each guarantor's personal income, personal debt payments and living needs. SBA requires at least 1.15x on the business and 1.0x globally, including the owners; from 1 October 2026 a change of ownership must show 1.25x on historical results. Every owner of 20% or more personally guarantees an SBA loan, so a guarantor with heavy personal debt can pull a file below the line even when the business covers comfortably. In an acquisition, the lender also deducts a salary for the buyer if the buyer will run the business and needs to live on it.

Covenants use the credit agreement's definition. After closing, a conventional loan usually tests DSCR, or a close cousin, quarterly on a trailing-twelve-month basis. The definition in the agreement governs, not the one used at underwriting, and small differences, such as whether distributions or capital spending come out, decide whether the test is passed. Read it before signing. See the covenants on a line of credit and what to do after a covenant breach.

What moves DSCR most

The new debt itself. The size, rate and amortization of the proposed loan drive the denominator. A longer amortization lowers the annual payment, which is one reason SBA 7(a) acquisition loans, repaid over up to 10 years, can carry more debt at the same coverage than a conventional loan repaid faster. See SBA 7(a) vs a conventional acquisition loan.

Add-backs. Documented add-backs raise the numerator; add-backs a lender will not credit are the most common reason coverage on the lender's spreadsheet falls short of the borrower's. The lender is not questioning the owner's honesty; it is asking whether each item will really stop recurring and whether the books show it.

Short-term, high-cost debt. Merchant cash advances collect daily or weekly and repay over months, so their annualized debt service is enormous against earnings. A business carrying several can show coverage below 1 even when it is healthy. Refinancing them into term debt can restore coverage at once, though not with SBA while an advance is active: SBA will not refinance an active merchant cash advance, and from 1 October 2026 one becomes eligible only once converted to a term loan that has amortized for at least 24 months with no new advance since; see MCA refinancing.

Seller financing. A seller note that is paid adds to debt service. One on full standby does not, which is why standby matters to coverage as well as to the SBA equity rule.

DSCR beside the other ratios lenders use

DSCR answers whether this year's cash covers this year's payments. Lenders pair it with other tests that answer different questions:

• Leverage, total debt divided by EBITDA, asks how much debt the business carries relative to earnings. Senior cash-flow lenders to lower-middle-market companies commonly lend 2x to 3.5x EBITDA. A business can pass DSCR on a long amortization and still fail leverage.
• Fixed charge coverage subtracts capital spending, taxes and distributions from the numerator, and sometimes adds rent to both sides. It is the usual covenant on asset-based lines.
• Global coverage, on SBA and many bank loans, adds the guarantors' personal finances.

Transparent's underwriting memo computes coverage the way the lenders reviewing the file will, with each add-back tied to its source, so a lender can trace every number in the ratio back to the books instead of rebuilding it. See how we underwrite.