Buy-to-Let Mortgages UK — Grow Your Property Portfolio

Buy-to-let mortgages are designed specifically for properties you intend to rent out rather than live in. They work differently from residential mortgages in several important ways.

The most significant difference is how lenders assess affordability. Rather than focusing primarily on your personal income, BTL lenders look at the expected rental income from the property. Typically, the rent needs to cover 125-145% of the monthly mortgage payment at a stress-tested interest rate.

BTL mortgages also typically require a larger deposit — usually a minimum of 25%, though some lenders offer 20% LTV products. Interest rates are generally slightly higher than residential mortgages, and most BTL mortgages are offered on an interest-only basis, meaning you only pay the interest each month and repay the capital at the end of the term.

The BTL market has become increasingly sophisticated, with products designed for different types of investors and properties.

Standard BTL — For individual landlords purchasing a single property in their personal name. This is the most straightforward option and typically offers the best rates.

Limited company BTL — Increasingly popular due to tax changes introduced in 2017. Purchasing through a Special Purpose Vehicle (SPV) limited company can be more tax-efficient, especially for higher-rate taxpayers. We work with lenders who specialise in limited company lending.

Portfolio landlord mortgages — If you own four or more mortgaged BTL properties, you're classified as a portfolio landlord. This triggers additional underwriting requirements, but we know which lenders handle portfolio applications efficiently.

HMO mortgages — Houses in Multiple Occupation can generate higher rental yields, but require specialist mortgage products. We have access to lenders who understand HMO licensing and rental calculations.

Multi-unit freehold blocks (MUFBs) — For investors purchasing entire blocks of flats. These require specialist lenders and we can guide you through the process.

The tax landscape for buy-to-let investors has changed significantly in recent years, and it's important to understand how these changes affect your investment strategy.

Section 24 mortgage interest relief — Since April 2020, landlords can no longer deduct mortgage interest from rental income before calculating tax. Instead, you receive a 20% tax credit. This particularly affects higher-rate taxpayers and is one of the main reasons many investors now purchase through limited companies.

Stamp Duty Land Tax (SDLT) — Additional properties attract a 3% SDLT surcharge on top of the standard rates. This applies to any property purchase where you already own another property (with some exceptions).

Capital Gains Tax (CGT) — When you sell a BTL property, you'll pay CGT on any profit. The current rates are 18% for basic-rate taxpayers and 28% for higher-rate taxpayers on residential property gains.

We always recommend speaking to a qualified tax adviser about your specific circumstances. We can help with the mortgage side, and we're happy to explain how different mortgage structures might interact with your tax position.

The minimum deposit for a buy-to-let mortgage is typically 25% of the property value, giving you a 75% LTV mortgage. However, some lenders offer products at 80% LTV (20% deposit), and a few specialist lenders even go up to 85% LTV.

As with residential mortgages, a larger deposit will give you access to better interest rates. The rate improvements are particularly noticeable at 60% and 50% LTV thresholds.

If you're purchasing through a limited company, deposit requirements are generally the same, though some lenders may require a slightly larger deposit for company purchases.

For portfolio landlords, some lenders look at the overall equity across your portfolio rather than just the deposit on the new property, which can sometimes work in your favour.