UK-Wide, PRA Supervisory Statement SS13/16 (Effective 30 September 2017): Special Underwriting Rules for Portfolio Landlords, Definition: 4+ Mortgaged BTL Properties Across ALL Lenders, Portfolio Questionnaire: All Properties; Balances; Rents; Rates; Values, Individual AND Aggregate ICR Stress Test: 125% at 5.5% Stressed Rate, Specialist Lenders: Paragon; The Mortgage Works; Kent Reliance; Fleet; Foundation, Top-Slicing: Personal Income Can Supplement ICR

Portfolio Landlord Mortgage UK 2026, PRA SS13/16 Rules, 4-Property Definition, ICR Stress Test, Portfolio Questionnaire, Specialist Lenders and Top-Slicing

Portfolio landlord mortgage UK 2026: PRA Supervisory Statement SS13/16 (effective 30 September 2017) introduced specialist underwriting requirements for portfolio landlords, defined as landlords with 4 or more mortgaged BTL properties across ALL lenders (not per lender; properties owned outright do not count). Portfolio questionnaire required: all mortgaged properties (address; value; balance; rent; rate; lender; expiry); aggregate portfolio LTV; aggregate ICR; void periods; business plan. ICR stress test: individual property minimum 125% rental coverage at stressed rate (typically 5.5%); 145% for higher-rate taxpayers (Section 24 impact). Aggregate portfolio ICR also required across all mortgaged BTL properties. Background portfolio assessment: even on a single BTL remortgage, the whole portfolio must be assessed. Specialist lenders dominate post-SS13/16 (Paragon; The Mortgage Works; Kent Reliance; Fleet Mortgages; Foundation Home Loans; Accord). Top-slicing: personal income can supplement ICR where rental income alone does not meet the 125% threshold at stressed rates.

14 min readUpdated 7 June 2026Last reviewed: 2 September 2026portfolio-mortgagePRA-SS13/16ICRbuy-to-let

Written and reviewed byRichard Wood· Founder, LetSafe UKLast reviewed: 2 September 2026

Portfolio landlord definition, portfolio questionnaire requirements and the 4-property threshold

PORTFOLIO LANDLORD DEFINITION (PRA SS13/16): any landlord with 4 or more mortgaged BTL properties at the time of the mortgage application, counted ACROSS ALL LENDERS. Properties owned outright are not counted but are disclosed. For joint applications, the combined portfolio of both borrowers is used. For company-held portfolios, the individual director/shareholder's total combined personal and company portfolio is assessed. PORTFOLIO QUESTIONNAIRE: the lender must obtain a full portfolio questionnaire covering ALL mortgaged BTL properties: address; current market value; outstanding mortgage balance; monthly mortgage payment; interest rate and type; mortgage expiry; lender name; monthly gross rent; annual void period; property management arrangements. Portfolio-level data: total value; total debt; aggregate LTV; aggregate annual rent; aggregate mortgage interest; aggregate ICR; CCJs or mortgage arrears; 2-5 year business plan. Most specialist lenders provide a standard Excel portfolio questionnaire template via their broker portal, applications without a complete portfolio questionnaire are declined outright.

ICR stress test (individual and aggregate), top-slicing, specialist lenders and background portfolio assessment

ICR STRESS TEST, INDIVIDUAL PROPERTY: ICR = annual gross rent, annual mortgage interest at stressed rate. Minimum ICR: 125% (rental income = 125% of stressed interest); 145% for higher-rate taxpayers (Section 24 impact). Stressed rate: typically 5.5% (even if actual product rate is lower). AGGREGATE PORTFOLIO ICR: total annual gross rent from all mortgaged BTLs, total annual mortgage interest at stressed rates, must also meet lender's minimum threshold; some lenders apply the ICR test at portfolio level only (aggregate approach, allows strong properties to offset weaker ones). BACKGROUND PORTFOLIO ASSESSMENT: even on a single BTL remortgage application, if the landlord has 4+ mortgaged BTL properties, the lender must assess the WHOLE portfolio, a common source of surprise for portfolio landlords expecting a straightforward single-property remortgage. TOP-SLICING: some lenders allow the landlord's personal non-rental income to supplement the ICR calculation where rental income alone falls short of the 125% threshold at stressed rates, not available from all lenders; more commonly available for individual BTL or limited company applications. SPECIALIST LENDERS (post-SS13/16): Paragon Bank (UK's largest specialist BTL lender; online portfolio questionnaire); The Mortgage Works, TMW (Nationwide BTL; competitive rates; aggregate approach); Kent Reliance (OneSavings Bank; flexible criteria); Fleet Mortgages (specialist complex BTL); Foundation Home Loans (adverse credit tolerance); Accord Mortgages (Yorkshire BS intermediary arm); Gatehouse Bank (Sharia-compliant); Vida Homeloans; Aldermore; Shawbrook Bank. Specialist BTL broker essential, broker fee typically 0.5-1.5% of loan facility.

Frequently asked questions

What is a portfolio landlord for mortgage purposes in the UK?+

A portfolio landlord is defined by the PRA (Supervisory Statement SS13/16) as any landlord with 4 or more mortgaged buy-to-let properties at the time of the mortgage application, counting across ALL lenders (not per lender). Properties owned outright without a mortgage are not counted towards the 4-property threshold, but are still disclosed in the portfolio questionnaire. Special underwriting rules apply: the lender must assess both the individual property ICR and the aggregate ICR across the whole portfolio.

What ICR stress test applies to portfolio landlord mortgages?+

Individual property ICR: minimum 125% rental coverage at the stressed interest rate (typically 5.5%). For higher-rate taxpayers, many lenders require 145% ICR (reflecting the Section 24 mortgage interest relief restriction). Aggregate portfolio ICR: the whole portfolio's total rental income must also meet the minimum ICR at stressed rates across all mortgaged BTL properties.

Which lenders offer portfolio landlord mortgages in 2026?+

Most high-street banks withdrew from portfolio landlord lending after PRA SS13/16. The market is dominated by specialist lenders: Paragon Bank (UK's largest specialist BTL lender); The Mortgage Works (Nationwide's BTL arm); Kent Reliance (OneSavings Bank); Fleet Mortgages; Foundation Home Loans; Accord Mortgages (Yorkshire BS); Gatehouse Bank (Sharia-compliant); Vida Homeloans; Aldermore; Shawbrook Bank. A specialist BTL broker is essential.

Does the whole portfolio need to be assessed for a single BTL remortgage?+

Yes. Under PRA SS13/16, even when a portfolio landlord (4+ mortgaged BTL properties) applies to remortgage a single property, the lender must assess the WHOLE background portfolio, a full portfolio questionnaire covering all mortgaged BTL properties is required. The application can be declined if the aggregate portfolio ICR falls below the lender's minimum threshold.

Templates recommended in this guide

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