A portfolio landlord is defined by the PRA as any borrower with four or more mortgaged buy-to-let properties. Portfolio landlords face additional underwriting: whole-portfolio stress tests, business plans, cash-flow forecasts and asset & liability statements.
The scenario
Mr K from Kettering held six BTL properties in an SPV limited company, all on 2-year fixes taken in 2024. Three fixes matured within the same 90-day window. Total portfolio value £1.42m, total outstanding debt £980k, gross monthly rent £6,850. Personal income (salary + dividends) £62,000.
Why this case was awkward
On the current stressed ICR of 145% at 8.49% pay-rate, two of the three maturing properties failed rental cover — the achievable rent would only pay 128% and 134% respectively. Simply product-transferring with the existing lender was possible but locked the landlord out of £142k of equity he wanted to release for a seventh property purchase.
How different lenders treated the case
- Lender A — 145% ICR at 5.5% for 5-year fix. All three properties passed. Portfolio review required.
- Lender B — 125% ICR at pay-rate for 5-year fix, plus top-slicing up to £30k p.a. from surplus personal income.
- Lender C — 145% ICR at 8.49% pay-rate on 2-year fix. Two properties failed.
- Lender D — Portfolio lender: single facility covering all six properties, blended stress test.
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Our approach
We prepared a portfolio schedule, 3-year cash-flow forecast and asset & liability statement. Lender B's 5-year fix combined with top-slicing bridged the ICR shortfall on the two weaker properties by allocating £11,400 of surplus personal income against them. The remaining property met ICR comfortably. Total equity released across the three refinanced properties: £142,000, deployed as deposit and stamp duty on property seven.
Outcome
All three refinances offered within 28 days on 5-year fixed products at 5.34%. Portfolio LTV moved from 69% to 71% (equity release factored in). Broker fee: £299 per case, agreed in writing before application.
Learnings for other portfolio landlords
- Longer fixes typically have a lower stressed rate — often decisive at high LTV.
- Top-slicing can rescue an ICR shortfall without needing to inject cash.
- Have a portfolio schedule, cash-flow forecast and A&L ready before application.
- Don't drift into a product transfer if equity release is a real goal — it's usually cheaper to refinance once than remortgage twice.
Frequently Asked Questions
- What is a portfolio landlord?
- Any borrower with four or more mortgaged buy-to-let properties. PRA rules require the lender to underwrite the whole portfolio, not just the subject property.
- What is top-slicing on a buy-to-let mortgage?
- Top-slicing allows surplus personal income to plug a shortfall in rental cover (ICR). Not our panel of 90+ lenders offers it and caps vary from £20k to £50k p.a.
- Is a limited company (SPV) better for BTL?
- It depends on tax position, portfolio size and long-term plans. For higher-rate taxpayers holding four or more properties it often is — but you should take independent tax advice.
Sources & References
- PRA buy-to-let underwriting standards (SS13/16) — Bank of England
Anonymisation & consent
Client name, location and identifying details have been changed. Income figures, lender names and dates are indicative of the actual case handled by our advisers. Written and published with the client’s consent as an illustrative example — individual outcomes will vary based on your circumstances, lender criteria and market conditions at the time.
Published 24 July 2026 · Last reviewed 26 July 2026 by Matty Stevens · Compliance oversight: Primis Mortgage Network. Your home may be repossessed if you do not keep up repayments on your mortgage.
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