BTL mortgage criteria — deposit, LTV, and rental coverage stress tests
Buy-to-let mortgages typically require a minimum 25% deposit (75% LTV) and pass a rental coverage stress test of 125%-145% at a notional interest rate of 5.5%-6.5%.
- Minimum deposit 25% (75% LTV): most BTL lenders; some specialist lenders offer 80% LTV at higher rates for experienced landlords
- Rental coverage ratio: rent must exceed 125%-145% of the mortgage payment at a stress test rate of 5.5%-6.5% — regardless of the actual mortgage rate
- Higher-rate taxpayer uplift: lenders apply 145% coverage ratio (not 125%) for higher-rate taxpayer landlords borrowing in a personal name — PRA guidance from 2017
- Interest-only BTL: widely available from most BTL lenders — unlike owner-occupied residential mortgages; interest-only maximises cash flow but capital must be repaid at end of term
Portfolio landlord rules — PRA underwriting standards
Landlords with 4 or more mortgaged BTL properties are 'portfolio landlords' under PRA standards introduced September 2017, triggering additional underwriting requirements.
- Portfolio landlord definition: 4 or more mortgaged residential BTL properties across all lenders — unencumbered properties do not count
- Additional requirements: full portfolio schedule (all properties, values, rents, mortgages); ICR assessment across the whole portfolio; business plan or landlord declaration
- Specialist lenders: Paragon and Foundation Home Loans are experienced portfolio landlord lenders; high street banks typically less experienced with complex portfolios
- Broker advantage: specialist BTL brokers access lenders' specific portfolio criteria and exclusive products; strongly recommended for 4+ property portfolios
Section 24 and the personal vs limited company BTL mortgage decision
Section 24 limits higher-rate income tax relief on mortgage interest to the basic rate (20%) for individual landlords — making limited company SPV BTL mortgages tax-efficient for higher-rate taxpayers.
- Section 24 cost: higher-rate (40%) taxpayer paying £20,000/year in mortgage interest loses £4,000 in tax relief vs full deduction — significant at scale
- Limited company SPV: company can fully deduct mortgage interest against corporation tax (25%); 125% rental coverage ratio regardless of director's personal tax rate
- Company BTL mortgage costs: typically 1%-3% arrangement fees (vs 0%-1% personal); slightly higher rates; dividend/salary extraction creates personal tax on withdrawal
- Consent to let: landlords renting a property with a residential mortgage need consent from the lender before letting — breach risks immediate repayment
Remortgaging BTL properties — triggers, equity release, product transfers
Proactive remortgage planning at least 3-6 months before fixed rate expiry prevents reversion to SVR and enables equity release for portfolio growth.
- Fixed-rate expiry: BTL mortgages revert to SVR (typically 2%-4% above available fixed rates) — begin remortgage planning 3-6 months before expiry
- Equity release: remortgage at same LTV on increased property value releases equity as cash for further deposits or renovation — must still pass rental coverage test
- Company transition: transferring personal BTL portfolio to a company requires sale to the company (triggering SDLT and CGT) — typically economic only for new purchases
- RRA 2025 (England): periodic tenancy from 1 May 2026 — lenders have updated BTL criteria; confirm periodic tenancy structure acceptable to new lender on remortgage