DSCR calculator: debt-service coverage ratio for UK SMB term loans
Debt-service coverage ratio is normalised EBITDA divided by total annual debt service including the proposed new loan. UK SMB term lenders want 1.25 or above for clean credit, 1.10 or above stressed, and an automatic decline below 1.0. This page walks through the calculation with worked examples at four common bands.
What this calculates
Debt-service coverage ratio (DSCR) is the multiple of annual debt service that a business covers from its trading cashflow. The numerator is normalised EBITDA from the last filed accounts. The denominator is the sum of every committed debt repayment for the next 12 months plus the proposed new loan repayment. Above 1.0 the business covers its debt; below 1.0 it does not. UK lenders use DSCR as the central affordability test on term-loan and asset-backed underwriting, with stress tests applied to test resilience to a rate rise or revenue dip.
The maths in plain English
The formula is simple: DSCR equals annual EBITDA divided by annual debt service. The quality is in the inputs.
Numerator: normalised EBITDA. Start with EBITDA from the latest filed Ltd accounts: profit before tax plus interest, plus depreciation, plus amortisation. Then normalise. Add back one-off costs (legal settlements, reorganisation, unusual write-downs). Add back owner remuneration above market rate. Strip out revenue that is not recurring (project income from a one-time contract that will not repeat).
Denominator: total annual debt service. Sum every committed debt repayment over the next 12 months. Existing term-loan instalments. Asset-finance instalments. Property-mortgage interest if owner-occupier. Director loans that are being serviced. The proposed new loan. Do not net off the company side of the directors loan account; that is not commercial debt.
Divide. Numerator over denominator. The result is a multiple. 1.0 means EBITDA covers debt service exactly. 1.25 means EBITDA exceeds debt service by 25 percent. 2.0 means EBITDA is twice debt service.
Worked example: DSCR of 1.0
Trading Ltd has £180,000 normalised EBITDA. Total committed annual debt service after the proposed new loan is £180,000 (existing £60,000 plus new £120,000). DSCR is 180,000 divided by 180,000, which equals 1.0.
At 1.0 the company covers its debt service exactly with nothing for tax, dividends, owner reinvestment or working-capital movement. Mainstream UK SMB lenders decline at 1.0. The business has no headroom for a rate rise, a slow month or an unexpected cost. Specialist post-decline lenders may engage at 1.0 if the asset cover is strong, but pricing reflects the risk: top of the band, often 5 to 10 percentage points above mainstream APRs.
Worked example: DSCR of 1.25
Same Trading Ltd with £180,000 normalised EBITDA. The proposed new loan is smaller: £80,000 annual repayment instead of £120,000. Total annual debt service is £140,000. DSCR is 180,000 divided by 140,000, which equals 1.29 (rounded to 1.25 for underwriting purposes when filed against a stress test).
1.25 is the standard UK SMB term-loan threshold for clean credit. The business has 25 percent headroom, enough to absorb a rate rise of around 200 basis points or a revenue dip of 15 percent before debt service consumes EBITDA. Funding Circle, iwoca, Allica Bank, Aldermore and Shawbrook all use 1.25 as the working floor for their core term-loan products. Below 1.25 the application moves to specialist routes or higher pricing; at 1.25 with clean credit and 2 plus years trading, mainstream pricing is on the table.
Worked example: DSCR of 1.5
Trading Ltd grows EBITDA to £225,000. Total annual debt service stays at £150,000 (existing £60,000 plus new £90,000). DSCR is 225,000 divided by 150,000, which equals 1.5.
1.5 is the band where mainstream UK SMB lenders compete on price. The headroom comfortably absorbs the standard stress test (rate plus 200 bps, revenue haircut 15 percent) and still leaves cover for tax, dividends and working-capital movement. Lender pricing tightens at this DSCR: applicants in this band often see headline rates 1 to 2 percentage points below the published "from" rate. Asset-backed lenders (Allica Bank, OakNorth, Aldermore Commercial) benchmark larger ticket sizes at 1.5 and above.
Worked example: DSCR of 2.0
Trading Ltd has £400,000 normalised EBITDA. Total annual debt service is £200,000. DSCR is 2.0.
2.0 puts the applicant inside the cleanest underwriting band. Multiple lenders compete; the rate is meaningfully below the published headline. Asset-backed and commercial-mortgage lenders engage on long-term structures (5 to 25 years) at this level. The practical question shifts from "will the lender say yes" to "which lender offers the best total cost of credit", which is rarely the lowest headline rate (arrangement fees, prepayment economics and security requirements vary materially at this band). For a quick comparison, see UK business loan rates 2026.
When this number matters
DSCR matters most on term-loan and asset-backed underwriting. It is the central number on a lender's affordability calculation. Three points where it bites hardest. First, refinancing existing debt: the new loan replaces existing facilities, so DSCR moves materially based on the new rate, term and capital structure. Refinancing onto a longer term often unlocks DSCR alone. Second, taking on additional debt while keeping existing facilities: the new debt stacks, total debt service rises, DSCR drops. Some applicants are surprised when an additional £100k facility takes DSCR below the underwriting floor because existing committed debt is heavier than they remembered. Third, growth-stage funding where forecast EBITDA is genuinely higher than filed EBITDA: lenders discount forecasts unless backed by signed contracts. A 1.25 forecast DSCR backed by a 0.95 filed DSCR is a hard sell.
Edge cases
Seasonal businesses. Annual DSCR can mask intra-year cashflow gaps. Lenders often run a separate "lowest-quarter DSCR" test for seasonal applicants (hospitality, retail with strong Christmas weighting, agricultural). Pass annual but fail lowest-quarter and the lender often requires a higher annual DSCR (e.g. 1.5) or asks for an overdraft alongside the term loan.
Holdco and group structures. Lenders calculate DSCR at the borrower level. If the borrower is a trading subsidiary of a holdco, only the trading subsidiary's EBITDA and debt service count. If the borrower is the holdco, consolidated EBITDA is used but only consolidated debt service can be netted against it. See holdco vs trading-co loan structures for how lenders treat the choice.
Negative-EBITDA businesses. A loss-making business has DSCR below zero, which is uncalculable in the standard sense. Mainstream UK SMB lenders decline. Asset-backed lenders may engage if the asset value covers the loan, but pricing is at the top of the band. Specialist routes (Bizcap, JPM Capital, Bolton Finance) consider cases on the merits.
Director-loan-account drawings. Drawings to clear an overdrawn DLA do not reduce EBITDA but do consume cash. Lenders flag this at underwriting. See the overdrawn DLA options guide for the S455 implications.
Multiple-facility blended view. When the borrower runs a term loan plus an MCA plus asset finance, a flat DSCR across the three understates cost. Use a blended cost of capital calculator alongside DSCR for a fuller picture.
FAQ
What DSCR do UK lenders want to see?
Most UK SMB term lenders set 1.25 as the floor for clean-credit applicants. Asset-backed and commercial-mortgage lenders often want 1.30 to 1.50 over a stress-tested rate. Specialist post-decline lenders accept 1.10 to 1.20 at higher pricing. Below 1.0 is an automatic decline because the cashflow does not cover the proposed debt service.
EBITDA or operating cashflow in the numerator?
Mainstream UK SMB lenders use EBITDA or normalised EBITDA (EBITDA adjusted for one-off items, owner remuneration above market and non-recurring revenue). Larger commercial-mortgage and asset-backed lenders move to operating cashflow or free cashflow because it captures working-capital movement. The number changes materially between EBITDA and FCF for businesses with growing receivables.
Total debt service or proposed debt service only?
Total. The denominator must include every existing committed debt repayment plus the proposed new repayment. Hidden facilities (unreported MCAs, asset-finance contracts in trading names, director loans being serviced from the company) are the most common cause of a calculated DSCR landing materially above the lender-calculated DSCR at offer stage.
How do lenders stress-test DSCR?
A typical stress test runs DSCR at the offered rate plus 200 basis points and at a 10 to 20 percent revenue haircut. Pass at 1.25 normally and 1.10 stressed is a common bar. Some asset-backed lenders run a 25 percent revenue haircut against base-case DSCR.
Does DSCR matter for an MCA?
Less directly. Merchant cash advance underwrites against daily card flow rather than DSCR. The equivalent measure is "fixed percentage of card take" (typically 8 to 18 percent) and lenders test that the resulting daily settlement is supportable from the card-flow trend. DSCR still matters indirectly because most MCA applicants also hold term debt.
How do I improve DSCR before applying?
Three levers. First, raise normalised EBITDA: cut owner remuneration above market, reverse one-off costs, recognise recurring revenue conservatively. Second, lower total debt service: refinance shorter-term debt onto longer terms before the new application or settle small expensive balances. Third, lengthen the proposed term: longer terms lower monthly debt service which lifts DSCR mechanically.
Is DSCR the same in commercial real estate underwriting?
Same name, slightly different inputs. Commercial real estate DSCR uses Net Operating Income (rental income less property operating costs but before depreciation, interest and tax) over annual debt service. Owner-occupier commercial mortgages add back the trading EBITDA the property generates. UK BTL DSCR is calculated on rental income alone, typically 125 percent at stress rate for higher-rate-tax landlords.
Should I use my forecast EBITDA or last year filed?
Lenders trust filed accounts more than forecasts. Most UK SMB underwriting models use the most recent filed full-year accounts as the primary input, with management accounts up to a recent quarter as the corroboration. A forecast-led DSCR calculation that beats the filed-accounts DSCR will be discounted unless the forecast is supported by signed contracts or hard pre-orders.
Get matched to lenders that fit your DSCR
Two-minute application. Asset-backed and commercial mortgage routes for DSCR 1.0+. Soft search only.
Get matched now →Editorial review next steps
If your DSCR calculation lands above 1.25 and the lender pool is mainstream, the next step is reading the relevant editorial reviews. Start with Funding Circle, iwoca and Allica Bank for term loans, or Aldermore and Shawbrook for asset-backed structures. If your DSCR sits in the 1.0 to 1.25 band, see the post-decline lender reviews: Bizcap, JPM Capital and Bolton Finance. BestBusinessLoans is editorial; for matched-lender introductions use our /get-quotes/ form.
By Oliver Mackman, Director, Best Business Loans Ltd. Last reviewed 10 May 2026.