Buy-to-let mortgage criteria 2026: what UK landlords need to qualify

Typical BTL mortgage requirements with a high-street lender in 2026:

- **Minimum deposit**: 25% of property value (75% LTV).

- **Stress test rate**: 5.5 to 7.5% depending on lender and product. Five-year fixed deals can sometimes stress-test at the product rate plus 1%.

- **Interest Cover Ratio (ICR)**: rental income must cover 125% to 145% of the stressed monthly interest, depending on lender and tax band.

- **Minimum personal income**: £25,000 in most cases, sometimes waived for portfolio borrowers.

- **Property minimum value**: £75,000 to £100,000.

- **Maximum age at end of term**: 75 to 85 depending on lender.

Suppose you want to borrow £150,000 against a flat letting at £900 per month.

**Stress test**: lender assumes 5.5% rate. Annual interest on £150,000 = £8,250. Monthly = £687.50.

**ICR at 125%**: rent must cover £687.50 × 125% = £859. You're at £900 — passes.

**ICR at 145%** (higher-rate taxpayer with most lenders): rent must cover £687.50 × 145% = £997. You're at £900 — fails.

Outcome: as a higher-rate taxpayer at this LTV, you either need to find a 145%-ICR lender (Foundation, The Mortgage Works, Paragon), put more deposit down to reduce the loan, or buy a property letting at £1,000+.

Several BTL lenders, including The Mortgage Works, Foundation and Aldermore, now decline new applications on properties at EPC band F or G outright. Others (Paragon, Kent Reliance) discount the rental income they're prepared to count by 10-20% on D-or-below properties.

From early 2027, expect mainstream BTL lenders to require minimum EPC C on new lending, anticipating the proposed 2028 regulation. The [EPC band C 2028 deadline](/guides/epc-band-c-2028-landlord-deadline) is now showing up as a lender criterion, not just a regulatory one.

Section 24 of the Finance Act 2017 phased out mortgage interest as a deductible expense for personal BTL landlords. By 2020-21 the deduction was replaced with a 20% tax credit. Higher-rate taxpayers saw effective tax on rental income rise significantly.

Result: roughly 70% of new BTL purchases in 2024-26 are made via Special Purpose Vehicle (SPV) limited companies, where mortgage interest remains a fully deductible business expense.

Limited company BTL mortgage rates run 0.3 to 0.8% above equivalent personal products. ICR requirements are typically lower (125% across the board, regardless of personal tax band). Set-up cost for an SPV: £15 to £30. Annual accountant cost: £500 to £1,500 per company.

If you're a higher-rate taxpayer building a portfolio from scratch, SPV makes financial sense from the first property. If you already own personally-held properties, transferring them into an SPV triggers Stamp Duty Land Tax + Capital Gains Tax events; the maths rarely makes sense unless the portfolio is large.

A 'portfolio landlord' under PRA rules is any borrower with four or more mortgaged BTL properties (including in joint names with anyone else).

Portfolio landlords face additional underwriting:

- Lender must consider the affordability of the entire portfolio, not just the new property.

- Most lenders cap portfolio LTV across all properties at 75%.

- Some require a minimum aggregate ICR across the portfolio (often 125% on average).

- A business plan, asset and liability statement, and full rent schedule must be provided.

Practical implication: every new BTL purchase after your fourth requires roughly 3x the underwriting paperwork.

**Refresh the EPC.** If your current rating is D or below and the property qualifies for cheap insulation upgrades, do the upgrade and re-EPC before applying. The improved rating can unlock 50-100 basis points off your rate.

**Increase the rent if the market supports it.** Higher rental income improves your ICR. Even a £50/month uplift can shift you from a 145% ICR fail to a pass.

**Reduce other debt before applying.** Some lenders apply a personal affordability layer on top of the rental ICR test. Paying down credit cards before application improves the calc.

**Use a specialist broker.** [Habito](/api/go/checkatrade?cert=eicr), L&C, Mojo and others specialise in BTL. The £400 to £800 broker fee usually returns 10x in better rate access.