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

Every lender quote on a commercial investment mortgage tests one of two cover ratios. ICR (interest cover ratio) on interest-only structures, DSCR (debt-service coverage ratio) on amortising structures. The thresholds, the stress assumption and the way the calculation handles different income streams all vary by lender. Get the test wrong at indicative-terms stage and the credit committee re-prices the offer down, or declines outright. This piece walks through both ratios using four real-shape Manchester deals, shows the maths at pay rate and at stress, and explains how we engineer the structure so the case clears comfortably rather than scraping over.

ICR vs DSCR: what each ratio actually tests

ICR (interest cover ratio) tests rental income against interest only. On a £1M facility at 7.0% pa interest-only, the annual interest is £70,000. If the rental income is £105,000 pa, the ICR is 150%. Lenders set the threshold between 140 and 160% depending on asset type and tenant covenant.

DSCR (debt-service coverage ratio) tests rental income against the full monthly payment, interest plus capital. On the same £1M facility at 7.0% pa over 20 years amortising, the monthly payment is around £7,750, the annual debt service is £93,000. The same £105,000 rent gives a DSCR of 113%. Most amortising lenders want 130 to 145%.

Two practical implications. First, DSCR is always tighter than ICR on the same facility because you are also covering capital repayment. Second, DSCR is heavily affected by term length, a 25-year term has lower monthly capital than a 15-year term, so the DSCR improves materially on longer terms.

The stress test: notional rate above pay rate

Lenders do not test cover at the pay rate. They test at a notional stressed rate, typically pay rate plus 1.5 to 2.0%, to confirm the deal still covers if rates move against the borrower at the end of the fix.

For a deal pricing at 7.0% pa, the stress rate is 8.5 to 9.0%. The cover ratio at stress is what credit committee actually approves against. We always model both numbers, at-pay and stressed, so the borrower knows whether their deal is comfortable or marginal before any application goes in.

Standard thresholds at mid-2026

Asset / structure	ICR threshold (IO)	DSCR threshold (amortising)
Single-let strong covenant	140%	130%
Single-let mid covenant	150%	135%
Multi-let commercial	155%	140%
Semi-commercial (blended)	145%	135%
Residential blend portfolio	145%	130%
Specialist / trading-style	160%	145%

Worked example 1: Spinningfields single-let office (ICR)

A Manchester investor buys a single floor in a Spinningfields M3 office building, let on a 10-year FRI lease (no break) to a national accountancy firm at £165,000 pa. Purchase price £2.2M, deposit £660,000 (30%), facility £1.54M on interest-only.

Indicative pricing from NatWest Manchester commercial at 6.8% pa, 5-year fixed, interest-only.

• Annual interest at pay rate: £1.54M x 6.8% = £104,720
• ICR at pay rate: £165,000 / £104,720 = 158%
• Stress rate at 8.3%: £1.54M x 8.3% = £127,820
• ICR at stress: £165,000 / £127,820 = 129%

The 129% stressed ICR is below the 140% strong-covenant threshold. NatWest would re-price or restructure. We have two levers: drop the LTV from 70% to 65% (facility falls to £1.43M, stressed ICR rises to 139%), or move the deal to Cynergy Bank which underwrites strong national covenants at a 140% ICR on a 5-year fixed at 7.0%. We typically take the second route, the rate is 20 basis points wider but the case clears cleanly.

Worked example 2: Rusholme Wilmslow Road parade (blended ICR)

A four-unit retail parade on Wilmslow Road in M14, ground floor only, three independent restaurants and one barber. Combined rent £88,000 pa, leases ranging from 3 to 8 years remaining. Purchase price £1.15M, deposit £345,000 (30%), facility £805,000 on interest-only.

Indicative pricing from Shawbrook at 7.5% pa, 5-year fixed.

• Annual interest at pay rate: £805,000 x 7.5% = £60,375
• ICR at pay rate: £88,000 / £60,375 = 146%
• Stress rate at 9.0%: £805,000 x 9.0% = £72,450
• ICR at stress: £88,000 / £72,450 = 121%

The stressed ICR of 121% is well below the 155% multi-let threshold. The deal does not work at 70% LTV. To clear:

• Drop LTV to 60% (facility £690,000, stressed ICR 142%, still short)
• Drop LTV to 55% (facility £632,500, stressed ICR 155%, clears)

Or move to amortising and run as DSCR. On a 25-year amortisation at 7.5%, monthly payment around £5,950, annual debt service £71,400, stressed DSCR runs differently and often clears multi-let deals that fail interest-only ICR.

The lesson: multi-let secondary parades on short leases need either materially lower LTV or amortising structures. Pretending otherwise wastes weeks.

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

A south Manchester landlord with four assets across M20 and M21, two commercial investment units in Didsbury Village and two semi-commercial parades on Beech Road in Chorlton. Combined value £4.1M, combined rent £278,000 pa across commercial and residential income. Refinancing existing facilities into a single portfolio facility at 65% LTV, total £2.665M, amortising over 25 years.

Indicative pricing from Shawbrook portfolio desk at 7.3% pa, 5-year fixed.

• Monthly payment: around £19,400
• Annual debt service: £232,800
• DSCR at pay rate: £278,000 / £232,800 = 119%
• Stress rate at 8.8%: monthly payment rises to around £22,000, annual £264,000
• DSCR at stress: £278,000 / £264,000 = 105%

That fails. Portfolio DSCR thresholds at Shawbrook sit at 130%. To clear:

• Term extension to 30 years: monthly £18,300, stress £20,900, stressed DSCR 133%, clears
• Or LTV reduction to 60% (facility £2.46M), monthly at stress £20,300, stressed DSCR 137%, clears

We usually run both and let the borrower choose. The 30-year term route keeps more capital invested for other deals; the 60% LTV route is cheaper on total interest paid.

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

A mixed-use block off Cutting Room Square in Ancoats M4, ground floor restaurant and bar (commercial), six apartments above (AST residential). Commercial rent £58,000 pa, residential rent £93,600 pa, total £151,600. Value £2.4M, refinance facility £1.68M at 70% LTV, amortising over 25 years.

Lenders treat residential blend differently. InterBay Commercial weights residential AST income at 100% for ICR purposes but applies a notional residential void of 5%. Shawbrook runs the residential leg at a residential ICR stress (typically 125%) and the commercial leg at a commercial ICR stress (145%), then blends.

At InterBay Commercial, 7.2% pa over 25 years amortising, monthly payment around £12,100, annual debt service £145,200, DSCR at pay rate 104%. Fails 130% threshold by a wide margin. To clear: LTV to 60% (£1.44M facility, monthly £10,400, DSCR 121%, still short).

This case does not work at 70%. We would either run it at 55-60% LTV, or split the building (refinance the residential element separately as a buy-to-let portfolio with a resi-specialist, refinance the commercial element on a smaller commercial facility). The split usually delivers more total borrowing capacity and tighter pricing on each leg.

Engineering the cover

Four levers, in order of effectiveness:

1. Term length on amortising structures. Extending from 20 to 25 to 30 years reduces monthly capital meaningfully. The rate is broadly flat across these terms.
2. LTV reduction. Every 5% LTV reduction typically improves cover by 10 to 15 percentage points.
3. Interest-only structure. If the lender permits IO, cover is calculated against interest only, which is easier to clear than DSCR. Cynergy Bank, InterBay Commercial and Shawbrook will run interest-only on the right asset.
4. Lender selection. A 145% ICR lender will clear a deal that fails a 155% ICR lender at the same rate.

Lender threshold table

The thresholds vary lender-by-lender. The ranges below reflect indicative behaviour we see across the panel on Manchester deals at mid-2026.

Lender	ICR threshold	DSCR threshold	Stress assumption
Lloyds Manchester commercial	150%	135%	Pay + 1.5%
NatWest Manchester	145%	130%	Pay + 1.5%
Barclays Manchester	150%	135%	Pay + 2.0%
Santander	155%	140%	Pay + 2.0%
Shawbrook	145%	130%	Pay + 1.5%
InterBay Commercial	145%	130%	Pay + 1.5%
Cynergy Bank	140%	130%	Pay + 1.5%
LendInvest	150%	135%	Pay + 2.0%

The headline ICR figure is the published policy; on individual cases each lender flexes around the central number for stronger covenants, longer leases or lower LTV. A 10-year unbroken FRI lease to an investment-grade tenant will often clear at the policy threshold even where the at-pay numbers look marginal.

A note on residential blend portfolios

Mixed residential and commercial portfolios are common across south Manchester landlords, particularly along Wilmslow Road through M14 and M20, and the Stockport Road spine through M19. Three modelling traps worth knowing:

1. AST void assumption. Lenders apply a notional residential void of 5 to 10% on the AST income leg. The headline rent roll is not the income used in the calculation.
2. Commercial rent demand history. Where commercial units have been re-let in the last 24 months at lower rents than the schedule suggests, expect the underwriter to take the lower trading number, not the schedule.
3. Service charge leak. Where the freehold structure has the landlord responsible for repair and insurance on a non-FRI basis, lenders deduct an assumed 10 to 15% leakage from gross rent before testing cover.

These adjustments often turn a 145% headline ICR into a 125% policy-adjusted ICR. We model them up front so the borrower knows the realistic number.

Send us the deal

Send the lease, the rent roll and the LTV target. We model ICR and DSCR at pay rate and at stress across the relevant lenders, and tell you which structure clears comfortably. Contact us or use the calculator for an indicative monthly figure.

For the wider commercial investment lender panel behind the Manchester desk, see the Manchester page on Commercial Mortgages Broker.

Cover ratios and stress assumptions reflect Manchester market lender behaviour in May 2026.