What is the minimum BTL deposit?
The minimum deposit for a buy to let mortgage in the UK is typically 25% of the property's purchase price. This means you need to fund at least a quarter of the property value yourself, with the lender providing the remaining 75% as a mortgage. On a property costing £200,000, that translates to a minimum deposit of £50,000.
Some specialist lenders will accept deposits as low as 20%, although these products come with higher interest rates and stricter criteria. At the other end of the scale, putting down 40% or more opens the door to the most competitive rates available in the market.
Why are BTL deposits larger than residential?
Residential mortgages are available with deposits as small as 5% to 10%. Buy to let deposits start at 25% because the risk profile is fundamentally different. Lenders know that investment properties carry additional risks that owner-occupied homes do not:
- Void periods — The property may sit empty between tenants, meaning no rental income to cover the mortgage
- Tenant risk — Tenants may default on rent or cause damage to the property
- Market sensitivity — Landlords are more likely to sell in a downturn than owner-occupiers, increasing the lender's exposure to falling prices
- Regulatory changes — Tax and regulatory shifts can reduce a landlord's ability to service the debt
A larger deposit gives the lender a bigger buffer against these risks. If property values fall by 15%, a lender with 75% LTV still has equity protecting their loan, whereas a 95% LTV residential mortgage would already be in negative equity.
How deposit size affects your rate
Your deposit directly determines your loan-to-value ratio, which is the single most important factor in the rate you are offered. BTL mortgage rates are structured in tiers based on LTV:
- 75% LTV (25% deposit) — Standard rates, widest product choice
- 70% LTV (30% deposit) — Slightly better rates than 75% LTV
- 65% LTV (35% deposit) — Noticeably improved pricing
- 60% LTV (40% deposit) — Best available rates from most lenders
- 50% LTV (50% deposit) — Marginal improvement over 60% LTV
The biggest rate improvement comes between 75% and 65% LTV. Dropping from 75% to 65% LTV might save you 0.3% to 0.6% on your rate, which on a £150,000 mortgage amounts to hundreds of pounds per year in reduced interest payments.
Example: On a £200,000 property with a £150,000 mortgage at 5.0%, monthly interest payments are £625. At 4.5% (achievable with a larger deposit), payments drop to £562.50 — saving £750 per year.
Can I use equity from another property?
Yes. If you already own a residential property or another buy to let, you may be able to use the equity in that property to fund your deposit. There are two common approaches:
Remortgaging your home
You can remortgage your existing home to release equity, then use the released funds as a cash deposit on the BTL purchase. This is one of the most popular strategies for first-time landlords. However, it increases the debt secured against your home, so you need to be comfortable with the additional risk.
Cross-charge or portfolio lending
Some lenders will accept a charge over another property in lieu of a cash deposit. This is more common with specialist or portfolio lenders and is typically only available to experienced landlords with multiple properties.
Gifted deposits for buy to let
Unlike residential mortgages where gifted deposits from family members are common, most BTL lenders do not accept gifted deposits. They expect the deposit to come from your own savings, equity release, or the sale of another asset. A few specialist lenders may consider gifted deposits on a case-by-case basis, but these are the exception rather than the rule.
Deposit requirements for different property types
Standard residential BTL
A standard single-let residential property — a house or flat let to a single household — requires the minimum 25% deposit from most mainstream lenders. This is the simplest and most competitive end of the BTL market.
HMO properties
Houses in multiple occupation usually require a larger deposit of 25% to 35%. Lenders view HMOs as higher risk because they involve multiple tenancies, more complex management, and additional licensing requirements. However, the higher rental yields from HMOs can offset the larger deposit requirement.
Holiday lets
Holiday let mortgages typically require 25% to 30% deposits. The seasonal nature of holiday rental income means lenders apply more conservative stress tests, which can limit your borrowing relative to the property value.
Commercial or mixed-use properties
Properties with a commercial element generally need 30% to 40% deposits and fall under commercial mortgage rather than BTL mortgage criteria. These products have different underwriting processes and are typically arranged through specialist brokers.
Strategies to build your deposit faster
Saving 25% of a property's value is a significant undertaking. These strategies can help accelerate the process:
- Start with a cheaper property — A £120,000 terraced house in a northern city requires a £30,000 deposit versus £75,000 for a £300,000 property in the South East. Yields in lower-value areas are often higher too
- Leverage existing property equity — If your home has increased in value, remortgaging to release equity is the fastest route to a BTL deposit
- Consider joint ventures — Buying with a partner, family member, or through a property investment club can reduce the individual deposit required
- Use a LISA for first property — If you have never owned property, a Lifetime ISA can provide a 25% government bonus on savings up to £4,000 per year, although this only applies to your first home purchase
Warning: Never borrow your deposit on an unsecured basis (such as a personal loan or credit card) and fail to disclose this to the lender. All mortgage applications require you to declare the source of your deposit, and non-disclosure is mortgage fraud.
How a broker can help with deposit planning
A specialist buy to let mortgage broker can help you understand the minimum deposit required for your target property, identify lenders whose criteria best match your situation, and calculate whether releasing equity from an existing property is a viable option. They can also model different scenarios showing how increasing your deposit by even a few thousand pounds could reduce your rate and improve your monthly cash flow.
Nesto matches you with experienced BTL mortgage brokers who understand the investment property market inside out. Get Matched Free to find out exactly what deposit you need and which rates you could access.