Interest-only buy-to-let mortgages have long been an attractive choice among landlords and property investors in the UK, offering low monthly costs that allow landlords to maximise rental income on their investments.
Buy-to-let mortgages that offer interest-only options have their own set of advantages and drawbacks that should be explored prior to making property investment decisions. This guide intends to explore these mortgage options so you can make knowledgeable choices regarding property investments.
The Evolution of the Buy-to-let mortgage interest only
Interest-only mortgages on buy-to-lets have grown in popularity due to their affordability and flexibility, making them a preferred choice for many landlords and property investors in the UK.
What is an Interest-Only Buy-to-Let Mortgage?
An interest-only buy-to-let mortgage is a type of loan wherein only interest is due each month; any remaining capital (original loan amount) will be paid off at the end of its term. This arrangement typically results in lower monthly payments when compared with repayment mortgages where payments include both interest and capital instalments every month.
The Historical Context
Over time, interest-only mortgages have evolved to meet the ever-evolving needs of landlords and property investors by offering flexible yet cost-effective financing. They’ve proven especially popular in the UK where buy-to-let has seen exponential expansion due to factors like rising property prices, changes in housing policy, and increasing investor enthusiasm for rental properties as an investment vehicle.
Interest-Only Vs Capital Repayment: Selecting the Appropriate Option
Mortgages come in two main repayment forms:
- Capital Repayment,
- and Interest-Only
Both options have different impacts on monthly repayments and overall financial planning. As these options will have different ramifications on payments and planning strategies, it’s crucial that you take time to understand both types of mortgages so as to find one which meets all of your individual financial requirements best.
Learn more about the Different Types of Mortgages
Understanding Capital Repayment Mortgages
With a capital repayment mortgage, your monthly repayments cover both interest and a portion of capital; over time this allows you to gradually pay down all loan amount; by the end of your mortgage term you will have paid back all capital and will own the property free and clear – providing a clear path toward property ownership; however monthly repayments typically are higher compared with interest-only options.
Understanding Interest-Only Mortgages
With an interest-only mortgage, monthly payments only cover the interest on your loan; capital repayment will take place upon expiry – either through the sale of property, lump sum payment, or investments – freeing up cash for other uses and potentially leading to lower monthly payments overall. While this approach often results in reduced mortgage repayments and frees up funds for investments at the end of the term repayment plans must still exist to successfully cover the repayment of the principal.
Your choice between capital repayment and interest-only ultimately depends on your finances, goals, and risk tolerance – always seek advice from an advisor when making this choice.
The Appeal of Interest-Only Buy-to-Let Mortgages: A Closer Look
There are several reasons why landlords prefer interest-only mortgages for their buy-to-let properties:
1) Lower Monthly Payments: A Practical Example
When choosing an interest-only mortgage, your mortgage payments tend to be reduced. By only paying off the interest on the loan, it frees up more of your rental income for other uses such as property maintenance or expanding your portfolio.
Here’s an example from real life: with a £200,000 mortgage at 3% interest, monthly interest payments would only come out to around £500 while repayment payments might require over £950 each month compared with just interest costs alone.
2) The Potential for Increased Rental Profits
Lower mortgage payments can lead to higher rental profits. The additional income saved from rental payments can be used for property maintenance, insurance, professional costs like letting agent fees, or even to invest in more properties.
3) No Minimum Income Requirements: What Does This Mean?
Many lenders do not set minimum income requirements for mortgages on buy-to-lets as the rental income from your property may suffice to qualify for one, making qualifying easier compared to qualifying for repayment loans.
4) Tax Efficiency and Interest-Only Mortgages
Mortgages for buy-to-let properties may be tax-efficient depending on how your finances and investments are organised; it’s always wise to consult a tax specialist in order to assess any possible tax implications.
The Potential Pitfalls of Interest-Only Buy-to-Let Mortgages
While interest-only buy-to-let mortgages offer several benefits, they also come with some potential downsides:
1) The Challenge of No Capital Repayment
An interest-only mortgage prevents you from contributing to owning the property directly. Instead, the full balance must still be repaid at the end of its term; typically through selling it off. Therefore, this type of mortgage relies heavily on rising property values during its term for repayment.
2) The Cost of Higher Total Interest
Over the term of the mortgage, you’ll likely pay more in interest compared to a repayment mortgage. This is because the interest is calculated on the full loan amount throughout the term, unlike a repayment mortgage where the interest reduces as you pay off the capital.
3) The Need for a Repayment Plan
Since your full mortgage balance will become due at the end of its term, a repayment strategy should be devised accordingly. This might involve selling the property, investing in other assets or using funds available elsewhere to repay the loan.
Understanding the Eligibility and Deposit Requirements
To qualify for an interest-only buy-to-let mortgage, lenders typically assess several factors. These include your credit score, income, and age. They also consider the number of mortgages you already have. These requirements are similar to those for any type of buy-to-let mortgage, as lenders generally expect landlords to prefer the interest-only option. Below we explain some of the eligibility requirements, for more read our guide on Buy To Let Mortgage Criteria.
1) Affordability Based on Rental Income
One of the key eligibility criteria is your expected rental income. Lenders want to see that the income from the property will be sufficient to cover the mortgage payments. This is usually assessed as a percentage of the mortgage amount.
2) Dealing with Adverse Credit Issues
If you have adverse credit issues, it can be more challenging to secure a mortgage. However, there are specialist bad credit brokers who can help you navigate this hurdle and find a lender willing to work with you.
3) Deposit Requirements
Deposit requirements for an interest-only buy-to-let mortgage typically range from 15% to 40% of the property value; however, most lenders expect no more than 75-80% loan-to-value ratio, meaning 20-25% is usually sufficient. A better mortgage deal as well as lower interest rates are often available for larger deposits.
Understanding these requirements and how to meet them can significantly improve your chances of securing an interest-only buy-to-let mortgage.
The Role of an Interest-Only Buy-to-Let Mortgage Calculator
For help estimating how much money you can borrow and monthly interest payments, consider an interest-only buy-to-let calculator. These tools can provide useful estimates based on factors like property value, anticipated income from rent, and expected mortgage term/rate. Use our simplistic but helpful buy-to-let mortgage calculator below.
Buy-to-Let Mortgage Calculator
Results
Borrowing
Monthly Payments (Interest only):
Loan to Value ratio (LTV):
Most lenders won't offer buy-to-let mortgages over a LTV of 80%.
Interest Cover Ratio (ICR):
Most lenders require rental income to be at least 125%-145% of the interest repayments for a buy-to-let mortgage.
Navigating Buy-to-Let Mortgage Interest-Only Rates
Interest rates on buy-to-let mortgages can differ dramatically, depending on your lender, the size and nature of your deposit, and personal circumstances.
In early 2023, most lenders were charging upwards of 3.99% for buy-to-let 2-year fixed buy-to-rate mortgages. However, always check live interest rates as rates have continued to increase during 2023.
It is always advisable to compare rates across lenders or use a mortgage broker in order to identify the most competitive offer; understanding how rates from different loans compare is also vital to making informed decisions about purchasing investment rental properties.

Case Study: Getting a Interest Only Mortgages for Buy-To-Lets
The client was an experienced landlord with several properties already and was keen on the idea of an interest-only mortgage due to its lower mortgage payments, which would allow them to maximise rental income.
After discussing their financial situation and long-term goals, we determined that the interest-only option was their optimal option. Together we found a lender offering competitive rates who was willing to consider lending against rental income from the property as collateral.
The client was able to secure financing and purchase property successfully, successfully managing their portfolio since. This case study highlights the advantages of interest-only on a buy-to-let property for landlords looking to maximise rental income and expand their property portfolios.
Conclusion: Making an Informed Decision
Mortgages that are interest only may be an attractive choice for landlords looking to maximise rental income and potentially capitalise on property price appreciation, yet it is crucial that landlords understand any possible downsides as well as having an action plan in place for repaying the balance at terms end – seeking professional advice could ensure making an appropriate choice given their unique circumstance.
FAQs: Interest-Only Buy-to-Let Mortgages
Can I get a buy to let interest-only mortgage?
Yes, you can get a buy-to-let interest-only mortgage. Many lenders offer this type of mortgage to landlords and property investors. Eligibility typically depends on factors like your credit history and credit score, the anticipated rental income from the investment property, and the size of your deposit.
Is buy to let interest only worth it?
An interest-only mortgage may be the perfect solution if your goal is to maximize the income from rent; its monthly mortgage payments tend to be significantly lower than repayment mortgages. Repaying it could include selling off the property or using funds available.
Why do you only pay interest on buy to let mortgage?
Under an interest-only buy-to-let mortgage, only interest payments are due each month to keep costs low and maximise rental profits. Your capital repayment will typically come through selling off the property or making investments elsewhere at the end of its mortgage term.
What is the average interest rate for a buy to let?
A buy-to-let mortgage's average interest rate can vary widely depending on its lender, individual circumstances, and deposit size. In early 2023, most lenders were charging upwards of 3.99% for 2-year buy to let fixed rate mortgage. However, always check live interest rates as rates have continued to increase during 2023.
What happens if you get to the end of an interest-only buy-to-let mortgage?
At the end of an interest-only buy-to-let mortgage loan, all capital must be repaid - whether this means selling off property, savings accounts, or investments - so a solid repayment strategy must be in place from day one.
How risky are interest only mortgages?
A mortgage that is interest-only can be risky if you don't have a plan to repay the capital at the end of the term. You're also reliant on property prices rising if your repayment plan involves selling the property. However, they can be a good option for landlords looking to maximise income from a rental property. Always seek advice from a mortgage advisor.
The Value of a Buy-to-Let Mortgage Advisor
Before investing in property, careful financial planning must always take place. There are various buy-to-let mortgage options available and an interest-only loan might not always be the optimal solution. Consulting an advisor who specialises in this field could help compare different loans and ensure you don’t overpay.
Understand that property markets can be unpredictable; so when making investment decisions it is wise to base them around your long-term investment goals and risk tolerance. An interest-only buy-to-let mortgage could provide key insight for making informed investment choices.