How DSCR and ICR actually work, explained with real Leeds examples

Every lender quote on a commercial investment mortgage tests one of two cover ratios. ICR (interest cover ratio) or DSCR (debt-service coverage ratio). Get the test wrong on the indicative model and the offer prices down at credit committee, or falls over entirely. This piece walks through both ratios using real-shape Leeds investment deals, works the numbers at pay rate and at stressed rate, and shows where each lender sets the threshold.

Definitions: ICR vs DSCR, what each ratio actually tests

ICR measures gross rent against interest only. The lender takes the rent (or the lower of rent and ERV), divides by the stressed interest cost, and wants the answer to clear a percentage threshold (typically 140 to 160%).

DSCR measures net operating income against the total monthly debt-service cost: interest plus capital repayment. Because amortisation is included, DSCR thresholds are lower in headline terms (130 to 145%) but the test is meaningfully tougher because the denominator is bigger.

Most single-asset, interest-only commercial investment mortgages run ICR. Most amortising portfolio facilities and larger single-asset capital-and-interest loans run DSCR. The choice often follows the lender's standard form rather than borrower preference.

The standard thresholds and the stress test

Lender desk archetype	Test	Threshold	Stress applied
High-street commercial (NatWest, Lloyds)	ICR	150–160%	pay rate + 2.0%
Challenger investment desk (Shawbrook, Cambridge & Counties)	ICR	140–150%	pay rate + 1.5–2.0%
Specialist semi-commercial (InterBay Commercial, YBS)	Blended ICR	140–145%	pay rate + 1.5%
Portfolio facility (Shawbrook, Cynergy Bank)	DSCR	130–140%	pay rate + 1.5%
Mixed-use with resi blend	DSCR	135–145%	pay rate + 1.5–2.0%

The stress is the part borrowers underestimate. A 7.5% pa pay rate stressed at +2.0% gives a 9.5% notional, and the cover test is run on the higher number. Plan the cover at the stressed rate, not the headline rate, every time.

Worked example 1: Wellington Place single-let office (ICR)

LS1, 8,400 sqft Grade A floor at Wellington Place. Let to a national professional services firm on a 10-year FRI lease, gross rent £210,000 pa, three years unexpired at indicative-terms stage with a tenant option to renew.

Purchase price £3.0M, loan £1.95M at 65% LTV interest-only on a 5-year fix. Pay rate 7.6% pa, stressed at +1.5% to 9.1%.

Annual interest at stressed rate: £1,950,000 x 9.1% = £177,450. Rent £210,000. ICR = £210,000 / £177,450 = 118%.

That fails a 140% threshold. To clear, the borrower needs to either reduce the loan or extend the cover differently. Drop the loan to £1.55M (52% LTV) and stressed interest falls to £141,050, ICR jumps to 149%. Shawbrook offered terms at the lower leverage, 7.6% pa, 5-year fix. The lesson: ICR caps the leverage on tight-rent assets, headline LTV is a ceiling not a target.

Worked example 2: Headingley semi-commercial parade (blended ICR)

LS6, Otley Road parade. Three units, each with a flat above. Retail rent £58,000 pa combined, residential AST income £42,000 pa combined. Gross blended rent £100,000 pa.

Purchase price £1.25M, loan £900,000 at 72% LTV interest-only on a 5-year fix. Pay rate 8.1% pa, stressed at +1.5% to 9.6%. InterBay Commercial is the natural desk.

Annual interest at stressed rate: £900,000 x 9.6% = £86,400. Blended rent £100,000. ICR = 116%. Marginal at a 145% threshold. The lender applies a haircut to residential income, typically 5%, so usable rent drops to £97,900 and ICR slides further.

To clear, the borrower agrees a switch to a 25-year capital-and-interest profile (the ICR test is interest-only, so this doesn't help ICR directly) and reduces leverage to £760,000 (61% LTV). Stressed interest: £72,960. ICR: 134%. Still light. The deal eventually lands at £700,000 (56% LTV), ICR 143%, on a 5-year fix at 8.1% pa.

Semi-commercial blended ICR almost always pulls the leverage well inside the headline LTV ceiling. Plan for it.

Worked example 3: Roundhay 4-asset portfolio (DSCR)

LS8, four mid-market investment assets: two retail units, one office, one industrial. Aggregate rent £285,000 pa, weighted average lease term 6.2 years.

Portfolio facility £2.5M at 65% aggregated LTV, 5-year fix, 25-year capital-and-interest amortisation. Pay rate 7.9% pa, stressed at +1.5% to 9.4%.

Monthly debt-service at 9.4% over 25 years on £2.5M: roughly £21,600/month, £259,200 pa. Rent £285,000.

DSCR = £285,000 / £259,200 = 110%. Fails a 130% threshold.

To clear, the borrower extends the amortisation to 30 years. Monthly debt-service at 9.4% over 30 years on £2.5M: roughly £20,750/month, £249,000 pa. DSCR climbs to 114%. Still light.

The fix in practice is a combination: leverage drops to £2.1M (55% LTV), amortisation extends to 30 years, monthly debt-service falls to roughly £17,400/month or £208,800 pa. DSCR: 137%. Clears 130%. Shawbrook wrote the facility at 7.9% pa on a blanket charge across the four assets.

DSCR caps leverage harder than ICR on amortising structures. Investors planning portfolio refinances should model DSCR at the stressed rate before they commit to a target loan number.

Worked example 4: South Bank mixed-use block (DSCR with residential blend)

LS3, South Bank. Five-storey block, ground-floor commercial (cafe and shop), four floors of residential ASTs (12 flats total). Commercial rent £58,000 pa, residential gross £168,000 pa. Total £226,000 pa.

Purchase price £2.95M, loan £2.0M at 68% LTV. 25-year capital-and-interest, 5-year fix at 8.3% pa, stressed at +1.5% to 9.8%.

Monthly debt-service at 9.8% over 25 years on £2.0M: roughly £17,750/month, £213,000 pa. Headline DSCR: £226,000 / £213,000 = 106%. Fails.

Residential income gets a 5% management/voids haircut, so usable resi income drops to £159,600. Total usable rent: £217,600. DSCR: 102%. Worse.

Resolution: leverage drops to £1.55M (53% LTV). Monthly debt-service falls to roughly £13,750/month, £165,000 pa. DSCR: 132%. Clears the 130% threshold on a mixed-use facility. Cynergy Bank wrote the deal at 8.3% pa.

Mixed-use blocks with heavy residential weight are DSCR-bound. The leverage you can actually get is meaningfully tighter than the headline LTV ceiling suggests.

Engineering the cover: term length, LTV, structure

Three levers move the cover test:

1. Extend amortisation (DSCR only). 25 to 30 years drops monthly debt-service and clears DSCR. No effect on ICR because ICR is interest-only.
2. Reduce leverage. The most reliable way to clear either test. Every 5% LTV reduction typically lifts ICR by 10 to 15 points and DSCR by 8 to 12 points at current rate levels.
3. Switch to interest-only at indicative stage. Where the lender allows IO, the test runs against interest only (ICR not DSCR), and the headline cover improves materially.

The lever that rarely helps: switching from fixed to tracker. The stress rate is applied either way, so the indicative cover is broadly the same.

The lender-by-lender threshold table

Indicative thresholds across the active Leeds investment desks at mid-2026, useful for sanity-checking which desks your deal is even worth approaching.

Lender	Test	Threshold	Stress	Typical max LTV
Shawbrook investment	ICR	140%	pay + 1.5%	70%
Shawbrook portfolio	DSCR	130%	pay + 1.5%	65%
InterBay Commercial	Blended ICR	145%	pay + 1.5%	75%
Cynergy Bank investment	ICR	145%	pay + 1.5%	70%
Cynergy Bank mixed-use	DSCR	140%	pay + 1.5%	65%
LendInvest commercial	ICR	145%	pay + 1.5%	70%
Cambridge & Counties	ICR	145%	pay + 1.5%	70%
Aldermore semi-commercial	Blended ICR	145%	pay + 1.5%	75%
YBS Commercial	Blended ICR	150%	pay + 2.0%	70%
NatWest investment	ICR	160%	pay + 2.0%	65%
Lloyds investment	ICR	160%	pay + 2.0%	65%

Two patterns worth noting. High-street commercial (NatWest, Lloyds) test tighter on threshold and stress, but the headline rate is usually 25 to 50 basis points keener for the right covenant. Challenger desks (Shawbrook, InterBay, Cynergy) run lighter cover tests and accept higher leverage, but price 25 to 50 basis points wider.

A common mistake at indicative-terms stage

The mistake we see most often: borrowers model their target loan against the headline LTV ceiling (say, 75%) without running the cover test. Then they go to offer expecting £900,000 against a £1.2M asset, only to find the cover test caps the loan at £720,000.

The fix is to model the cover test first and the LTV ceiling second. Take the rent, divide by the stressed threshold (e.g. £100,000 / 1.45 = £68,966 stressed interest budget), then back-solve to the maximum loan at the stressed rate (e.g. £68,966 / 9.5% = £726,000 maximum loan). Compare against the LTV ceiling (£900,000 at 75%) and take the lower. That is the actual loan number.

On most Leeds semi-commercial and mixed-use deals at mid-2026, the cover test caps the loan well inside the headline LTV ceiling. Build that into the model from day one.

Send us the deal

If you are modelling a Leeds commercial investment purchase or refinance and want the cover test run at indicative-terms stage before you commit to a loan size, send the rent roll, lease details and target loan amount. We will run ICR and DSCR at pay rate and at stressed rate across three to five lender thresholds inside 48 hours, so you know what is actually fundable.

Contact us to discuss your investment case.

For the wider commercial investment lender panel and how the Leeds desk plugs into it, see the Leeds page on Commercial Mortgages Broker.