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What is the required "customer contribution" for private landlords?

13th February 2026

By Simon Carr

In the world of UK property investment, the term “customer contribution” is a professional way of describing the amount of money a landlord must provide from their own resources to secure a loan. Whether you are looking at a standard Buy-to-Let (BTL) mortgage or a short-term bridging loan, lenders rarely provide 100% of the funds needed to buy a property. The gap between the loan amount and the total purchase price is what you, the landlord, must contribute.

Understanding exactly what is the required “customer contribution” for private landlords is vital for effective cash flow management. This contribution is not just the deposit; it often includes various fees and taxes associated with the purchase. Failing to account for the full scale of this contribution can lead to delays or even the collapse of a property deal.

The Basics of Loan-to-Value (LTV)

The primary factor that determines your required contribution is the Loan-to-Value (LTV) ratio. This is a percentage that represents the size of the loan compared to the value of the property. For example, if a property is worth £200,000 and the lender offers a 75% LTV mortgage, they will lend you £150,000. The remaining £50,000 (25%) is your “customer contribution” or deposit.

For most private landlords in the UK, the standard LTV for a Buy-to-Let mortgage typically sits between 60% and 75%. While some niche lenders may offer up to 80% LTV, these products often come with higher interest rates and stricter eligibility criteria. Consequently, most landlords should prepare to contribute at least 25% of the property’s value in cash.

How Rental Income Affects Your Contribution

Unlike residential mortgages where your personal salary is the main factor, Buy-to-Let lending is primarily driven by the property’s ability to generate rent. Lenders use something called the Interest Cover Ratio (ICR) to determine if the rental income is sufficient to cover the mortgage payments and other costs.

Standard ICRs often require the rental income to be 125% or 145% of the mortgage repayments, calculated at a “stress test” interest rate (which is usually higher than the actual rate you pay). If the property’s expected rent does not meet these requirements, the lender may reduce the amount they are willing to lend. This means you might have to increase your customer contribution to make the deal viable, even if you originally planned for a higher LTV.

Additional Costs to Include in Your Contribution

When calculating what is the required “customer contribution” for private landlords, you must look beyond the deposit. A landlord’s total cash requirement usually includes:

  • Stamp Duty Land Tax (SDLT): In the UK, landlords generally pay a 3% surcharge on top of standard Stamp Duty rates when buying an additional residential property. You can calculate your potential tax liability on the official GOV.UK website.
  • Product Fees: Many lenders charge arrangement fees, which can be a flat fee or a percentage (often 1% to 2%) of the loan amount.
  • Valuation Fees: You will need to pay for a professional to value the property to ensure it is worth the purchase price.
  • Legal Fees: You will need a solicitor to handle the conveyancing and legal aspects of the charge.

The Role of Credit History

Your personal financial history can also influence the required contribution. If you have a lower credit score, lenders may view you as a higher risk. To mitigate this risk, they might require a lower LTV, effectively forcing you to provide a larger customer contribution. Conversely, landlords with an excellent credit history and a proven track record may access higher LTV products.

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Using Equity as a Contribution

Not all customer contributions have to be in the form of physical cash. If you already own other properties with significant equity, you may be able to use a “cross-collateralisation” strategy. This involves the lender taking security over both the new property and an existing one. By using the equity in your current portfolio, you might be able to reduce the amount of actual cash you need to put into a new deal. However, this increases the risk to your existing assets, as multiple properties could be at risk if you fail to keep up with repayments.

Portfolio Landlords vs. Single Property Owners

The required contribution can also change depending on your status as a landlord. If you own four or more mortgaged properties, you are classified as a “portfolio landlord” by the Prudential Regulation Authority (PRA). Lenders must carry out a more in-depth assessment of your entire portfolio, not just the property you are currently buying. If your other properties are highly leveraged (meaning they have high loans relative to their value), a lender may ask for a larger contribution on your new purchase to ensure your overall portfolio remains balanced.

People also asked

Can I get a Buy-to-Let mortgage with a 10% contribution?

It is very rare to find a Buy-to-Let mortgage with only a 10% contribution. Most lenders require a minimum of 20% to 25% to protect themselves against property price fluctuations and rental voids.

Is the customer contribution different for Limited Companies?

Generally, the LTV ratios and required contributions for Limited Company landlords are similar to those for individual landlords, typically around 25%. However, the interest rates and arrangement fees may differ slightly.

Can I use a gifted deposit as my contribution?

Some lenders allow gifted deposits from close family members, but they often prefer the landlord to provide at least some of their own funds. Each lender has specific rules regarding the documentation needed for gifted funds.

Does a “no-deposit” option exist for landlords?

While 100% LTV mortgages for landlords do not typically exist, you may be able to achieve a “no-cash” deal by using equity in other properties as security for the loan.

Do HMOs require a larger customer contribution?

Houses in Multiple Occupation (HMOs) are often seen as more complex risks. While some lenders offer 75% LTV, many prefer a higher customer contribution of 30% to 35% due to the increased management and maintenance costs involved.

Summary of Landlord Contributions

Determining what is the required “customer contribution” for private landlords involves more than just looking at a mortgage headline rate. You must factor in the deposit (usually 25%), the 3% Stamp Duty surcharge, legal fees, and the potential impact of rental stress tests on your borrowing capacity.

Always remember that property investment carries financial risks. Markets can fluctuate, and rental income is not always guaranteed. Ensuring you have a sufficient cash buffer beyond your initial contribution is a hallmark of a responsible and successful private landlord.