Debt service cover ratio

The debt service cover ratio (DSCR) compares the cash a business generates in a period with the interest and capital repayments it must make on its borrowing in the same period. A ratio of 1.0 means every pound of cash available goes on debt service; lenders set a higher minimum in the facility agreement and test it at regular intervals, so the exact definitions of “cash flow” and “debt service” in that agreement decide whether the covenant is met.

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What does the debt service cover ratio measure?

DSCR asks whether the business can pay its lenders out of what it earns, without selling assets, raising new money or running down cash. The basic form is:

DSCR = cash flow available for debt service ÷ (interest + scheduled capital repayments)

The key difference from interest cover is the capital element. HMRC’s International Manual at INTM516010 describes interest cover as a measure of a borrower’s ability to service its debt, to pay the interest and other regular costs of borrowing, rather than its ability to repay the principal. DSCR adds the principal. A business with comfortable interest cover can still fail a DSCR test if its loans amortise quickly.

How do lenders calculate the cash flow figure?

There is no statutory definition; each facility agreement sets its own. HMRC’s guidance at INTM516080, written for thin capitalisation agreements but drawing on bank practice, describes two common routes:

Start from EBITDA and adjust it to cash. Deduct capital expenditure, increases in working capital, tax paid, dividends paid, acquisitions and non cash credits; add reductions in working capital, dividends received, non cash debits and provision increases. HMRC says the resulting surplus should at least cover expected interest and scheduled debt repayments.
Start from net operating cash flow in the cash flow statement, which is operating profit adjusted for non cash items such as depreciation, amortisation and working capital changes, and agree a covenant for cash flow cover of interest plus all debt repayments.

INTM516080 adds two practical points. Where debt is a bullet loan repayable in full at the end of the term, a notional annual repayment may be included, probably on a straight line basis. And the ratio should be greater than 1:1 because there will be other calls on cash flow, such as dividends.

Many agreements simply use EBITDA, sometimes less capital expenditure and tax, as the numerator. HMRC notes at INTM516070 that lenders may require both EBITDA and cash flow covenants, and that EBITDA is often used as a rough substitute for cash flow. See EBITDA explained for why that substitute can flatter the position.

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What does a worked example look like?

Illustration only. A company has a five year term loan of £500,000 repayable in equal annual instalments of £100,000, plus interest of £30,000 in the year. Its figures for the year are:

Item	£
EBITDA	260,000
Less capital expenditure	(40,000)
Less tax paid	(30,000)
Less increase in working capital	(15,000)
Cash flow available for debt service	175,000
Debt service (£100,000 capital + £30,000 interest)	130,000

DSCR is £175,000 ÷ £130,000 = 1.35. On an EBITDA only definition it would be £260,000 ÷ £130,000 = 2.0. Interest cover on EBITDA would be £260,000 ÷ £30,000, nearly 9 times. If the facility required a minimum DSCR of 1.25 on the cash flow definition, the company would pass with limited room; a £15,000 shortfall in cash flow would take it to 1.23 and into breach.

How do lenders set the covenant level?

Covenants are promises in the loan agreement that are applied to the borrower’s results at intervals to check it is maintaining its ability to service and repay the borrowing; INTM516010 notes that a breach will normally trigger close attention from the lender. The level a lender will accept depends on the business. HMRC’s guidance at INTM516050, on arm’s length interest cover, lists the kind of factors a third party lender weighs:

the cover typical for that type of business, since figures vary considerably between sectors;
whether the group is acquiring a business, in which case a lender may accept lower cover for several years before a return to a steady state;
whether realisable property is available as security, which may make lenders more relaxed about cover.

Lenders also build in headroom. INTM515060 explains that covenants should have room for manoeuvre so that normal setbacks such as a downturn can be absorbed without a breach, and that neither bank nor borrower expects the borrower to run up against the limit. ACCA’s article on analysing financing alternatives makes the borrower’s side of the point: directors must consider whether they are willing to live with the covenants before taking on the debt.

Which definitions in the facility agreement change the answer?

Most DSCR disputes come from definitions rather than arithmetic. Points to check include:

Test period. Rolling twelve months, financial year or a shorter period, and whether forecast as well as historical cover is tested.
Accounting basis. INTM515070 explains that when accounting standards change, covenant compliance is often monitored on the original basis, so called frozen GAAP. The IASB’s IFRS 16 effects analysis likewise notes that covenants are often based on the accounting requirements in place when the facility was signed. This is relevant now that FRS 102 brings most leases onto the balance sheet for accounting periods beginning on or after 1 January 2026 (paragraph 1.37); ACCA advises an early impact assessment where covenants are in place.
Lease payments. Whether they count as debt service, which lowers DSCR, or as operating costs within the cash flow figure.
Netting. Whether interest receivable is deducted from interest payable. HMRC’s example at INTM516040 shows cover of 2.6 on a gross basis rising to 3.9 on a net basis with the same results.
Exceptional items and equity cures. Whether one off costs are added back and whether shareholders can inject cash to cure a breach.

How does this compare with buy to let interest cover tests?

Residential buy to let mortgages use a simpler cousin of DSCR. The Prudential Regulation Authority’s supervisory statement SS13/16 expects lenders to define the interest coverage ratio as expected monthly rental income divided by monthly interest payments, allowing for likely future rate increases (paragraph 2.3). It records the industry standard minimum as 125% (paragraph 2.7) and expects lenders to assume a borrower interest rate of at least 5.5% for the stress test (paragraph 2.14). This test covers interest only, not capital, and SS13/16 excludes corporate lending conducted through banks’ commercial divisions, where DSCR style covenants are more usual.

What should a business do if DSCR is getting tight?

Prepare a rolling cash flow forecast on the covenant definitions, not just the accounts, so a potential breach is visible before the test date. Options include reducing working capital through faster collection (see debtor days), deferring discretionary capital expenditure or dividends, and asking the lender for a reset or waiver before the breach occurs. ACCA’s lease factsheet makes the same point about accounting changes: highlight issues to lenders sooner rather than later.

What mistakes are common?

Testing DSCR on EBITDA when the agreement defines cash flow after tax and capital expenditure, or the reverse.
Leaving out lease payments or hire purchase instalments that the agreement treats as debt service.
Confusing DSCR with interest cover, which ignores capital repayments; see gearing ratio for the related balance sheet tests.
Ignoring a bullet repayment because no capital falls due in the test period.
Reading a single year’s ratio without the trend; cover that falls each quarter is a warning even while above the minimum.

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Reviewed by Christine Anderson, Broker, Solar Protect. Last reviewed 8 October 2026. Part of Accountapedia, the Solar Protect guide to UK tax and accounting. This page is general information, not personalised advice.