Retirement Interest-Only (RIO) Mortgages: How They Work, Costs, and Eligibility

Getting a mortgage can work differently later in life, as lenders will need to consider whether your income can reliably support the mortgage payments throughout retirement.

A retirement interest only mortgage, often referred to as a RIO mortgage, is a specific mortgage option for borrowing in later life. It is primarily used to release money from your home or remortgage an existing mortgage into retirement while allowing you to remain the owner of your home.

In this article, we walk you through exactly how RIO mortgages work, the criteria you need to meet, and the costs and options to consider before choosing a RIO mortgage. Let’s begin.

What Is a Retirement Interest-Only Mortgage?

A RIO mortgage is a specialist mortgage product available to homeowners typically aged 50 and over who want to borrow against their home while continuing to make monthly mortgage payments during retirement.

Similar to a standard interest-only mortgage, when you take out a RIO mortgage, your monthly payments will cover only the interest and will not reduce the outstanding amount that you originally borrowed.

The key difference is that a RIO mortgage does not usually have a fixed end date as to when the original loan must be repaid.

This means you could potentially keep the mortgage throughout your entire retirement, provided you continue to meet the monthly payments and the terms of your mortgage.

How Does a RIO Mortgage Work?

As a RIO mortgage is designed for borrowers who are in, or progressing to, retirement, the lender will need to assess your income to make sure you can afford the monthly payments throughout retirement. This usually involves looking at your current and future income, alongside your regular financial commitments.

Once your RIO mortgage completes, you will make the agreed monthly interest payments in much the same way as you would with another mortgage.

The key differences between a RIO mortgage and a standard repayment mortgage comes down to eligibility, your monthly payments, and how the original loan is paid at the end of the mortgage agreement.

Unlike a repayment mortgage, you are not gradually paying back the original loan each month. Instead, your monthly payments will only cover the interest charged on your borrowing. This will leave the amount you borrowed to remain outstanding throughout the mortgage.

Unlike a standard interest-only mortgage, a RIO mortgage does not usually have a set date by which the full mortgage balance must be repaid. With a standard interest-only mortgage, the outstanding balance is normally due when the agreed mortgage term ends.

With a RIO mortgage, the outstanding balance will usually become due when:

• You sell your home
• You move permanently into long-term care
• You, or the last remaining borrower on a joint mortgage, pass away

This allows you to continue living in your home throughout retirement, without having to repay the original mortgage balance by a fixed date. Instead, you simply continue making the required monthly interest payments for as long as the mortgage remains in place.

To see how a RIO mortgage works in practice, let’s take a look at an example of a homeowner borrowing £100,000 against a property worth £300,000:

• Property value: £300,00
• RIO mortgage: £100,000
• Interest rate: 5.5%
• Monthly interest payment: £458.33
• Annual interest paid: £5,500

In this example, if the interest rate remained at 5.5% and you made only the required monthly interest payments, the £100,000 mortgage balance would not reduce or increase. Whether the mortgage became due after 5, 15 or 30 years, you would still have £100,000 to repay.

It’s important to note that you may be able to make voluntary repayments towards the capital during the mortgage. This can help reduce the amount you owe and, in turn, lower the interest charged on your remaining balance. However, lenders can set limits on how much you can repay without charge, and an early repayment charge (ERC) may apply if you repay some or all of the mortgage during a particular deal period.

However, it is important to note that interest rates can change. As with a standard mortgage, RIO mortgage products can have fixed or variable rates, so your monthly interest payments may increase or decrease over time.

Who Is Eligible?

There is no single set of criteria that applies to all RIO mortgages. Instead, the exact criteria will differ between lenders and will depend on your individual application and wider financial circumstances. With that said, most lenders in the UK will assess the following:

Your age: The minimum age requirements can vary between lenders, but most RIO products will be available from age 50 or 55.

• Your income: You will need to show that you have sufficient and sustainable income to afford the monthly interest payments throughout retirement.
• Your property: The lender will assess whether your home meets its property and valuation requirements
• Your loan-to-value: Lenders can restrict how much you borrow as a percentage of your property’s value.
• Joint applications: The lender may consider whether the mortgage would remain affordable if one borrower passes away and the surviving borrower needs to maintain the payments alone.

As with any mortgage application, meeting the basic RIO mortgage criteria does not necessarily guarantee that your application will be accepted. Each lender will assess your application against its own criteria, so the amount you can borrow and the products available will depend on your circumstances and your chosen lender’s requirements.

How Do Lenders Assess Affordability and Borrowing Limits?

As a RIO mortgage is a type of loan that could remain in place throughout the entirety of your retirement, your lender will need to check whether or not your income can reliably support the monthly payments.

As a result, the affordability assessment can differ from a standard mortgage assessment with more of a focus on the following:

• Your retirement income: Lenders will assess your total income now and the income you can reliably expect to receive throughout retirement. This can include the State Pension, workplace and private pensions, investments and rental income where applicable.
• Your monthly outgoings: Similar to a standard mortgage assessment, your regular spending and financial commitments will be compared against your income to determine whether you can comfortably afford the monthly mortgage payments.
• Joint affordability: For joint applications, lenders will usually assess both applicants’ financial circumstances to check whether the mortgage would remain affordable in the case that one applicant passed away.
• Your credit history: Your credit record will be checked as part of the lender’s overall assessment of your application

It is important to note that a RIO mortgage product will usually restrict the total amount you can borrow based on your property’s value. This is known as the retirement interest only mortgage LTV, or loan-to-value limit.

What this means is that you will not usually be able to borrow against the full value of your home. Instead, the lender will set a maximum percentage that it is prepared to lend, with the remaining value staying as equity in your property.

While the maximum LTV will vary between lenders and products, RIO mortgages are commonly available up to around 50% – 60% of the property’s market value.

To see how this works in practice, let’s take an example of a property worth £300,000:

• Property value: £300,000
• Maximum RIO LTV: 55%
• Maximum borrowing based on LTV: £165,000
• Maximum borrowing based on affordability: £120,000
• Your maximum RIO mortgage: £120,000

In this example, although the property value and LTV would allow borrowing of up to £165,000, your affordability assessment would limit the mortgage to £120,000.

Ultimately, your maximum borrowing will be determined by both the lender’s LTV limit and how much you can afford.

What Interest Rates Are Available?

As with a standard mortgage, a fixed-rate RIO mortgage keeps your interest rate and monthly payments the same for an agreed period. Once that period ends, you may be moved onto your lender’s standard variable rate (SVR) or can arrange a remortgage into another deal.

Rates shown are examples of five-year fixed RIO mortgage products available in September 2026 and are provided for illustration only. Mortgage rates and products can change at any time. The rate available to you will depend on your circumstances, LTV, lender criteria and the products available when you apply.

As the table shows, five-year fixed RIO mortgage rates can vary depending on your LTV and the lender. While a fixed rate provides certainty over your monthly payments for an agreed period, variable-rate RIO mortgages may also be available.

With a variable rate, your interest rate and monthly payments can increase or decrease over time. Changes to the Bank of England base rate and wider market conditions can influence the rates available.

When you compare retirement interest-only mortgages, the interest rate is important, but it should not be considered in isolation. A lower interest rate does not always mean that a mortgage will be cheaper, particularly if the product comes with a higher arrangement fee or other charges.

You should also consider whether the rate is fixed or variable, how long any initial fixed-rate period lasts and what interest rate you could move onto afterwards. It is also important to check any early repayment charges and whether you can make voluntary capital repayments without charge while the RIO mortgage remains in place.

As retirement interest only mortgage rates and product features can differ across the market, a whole-of-market mortgage broker can compare suitable options from different lenders on your behalf.

This allows you to consider the interest rate alongside the fees, lending criteria and product features to understand which options fit your circumstances.

How Much Does a Retirement Interest-Only Mortgage Cost?

Unlike a repayment mortgage, your regular payments on a RIO mortgage only cover the interest charged on the amount you have borrowed. This means your monthly cost will largely depend on your outstanding mortgage balance and the interest rate applied to it.

To see how interest can add up over time, let’s take a £100,000 RIO mortgage with a fixed interest rate of 5.5%. In this example:

• Your monthly interest payment is £458.33
• Your annual interest payments total £5,500
• Your £100,000 mortgage balance remains unchanged as no capital repayments are made

Because your monthly payments on a RIO mortgage only cover the interest charged, the original mortgage balance of £100,000 does not reduce. This end mortgage balance would then be repaid when you sell your home, move permanently into long-term care or pass away.

The total cost can therefore be estimated by multiplying your annual interest payments by the number of years the mortgage remains in place. For example, our table shows that 10 years of interest payments would equal £55,000 total costs in interest.

However, it is important to note that these calculations are for illustration purposes only and assume that the interest rate remains unchanged. If your interest rate increases or decreases over time, the total amount of interest you pay will also change.

Alongside the interest you pay, there may also be additional fees that you need to consider. These can include a product or arrangement fee, property valuation costs, legal fees and any fee charged by your mortgage broker.

What Are the Pros and Cons of RIO Mortgages?

One of the main advantages of a RIO mortgage is that it allows you to continue borrowing much later into life and throughout your retirement, when a standard mortgage term may be more restricted by your age.

As an interest-only mortgage, you will only have to pay the interest each month. This can keep your regular monthly payments considerably lower than with an equivalent repayment mortgage.

There are some RIO products that can also allow you to make voluntary overpayments towards the capital if you decide that is what works for you. This can provide you with the added flexibility of reducing your outstanding balance over time.

With that said, a RIO mortgage is not the only mortgage option and it is important to understand the potential drawbacks that could apply to you. To help you get to grips with the pros and cons of RIO mortgages, we have outlined the main advantages and disadvantages below:

Ultimately, when weighing up the pros and cons of RIO mortgages, the key consideration is whether you are comfortable making monthly interest payments throughout retirement while leaving the original mortgage balance outstanding.

As such, you will need to plan and consider whether your retirement income can comfortably support these payments, both now and in the future.

Going hand-in-hand with this are your longer-term plans. For example, you may want to consider whether you plan to make overpayments, how much equity you would like to retain in your home and how the outstanding mortgage could affect any inheritance you intend to leave behind.

If you’ve got questions or need help exploring your options, working with a mortgage broker can help you weigh up all these considerations. They will be able to assess your specific circumstances and explain whether a RIO mortgage could be suitable for your needs.

Are Retirement Interest-Only Mortgages a Good Idea?

Whether a RIO mortgage is a good idea will wholly depend on your personal finances and plans for the future. There is no single answer that will apply to every borrower.

What a RIO mortgage can provide is a practical way of continuing to borrow into your retirement. This can allow you to complete home improvements, take a bucket list holiday or support your family. However, you will need to take into consideration exactly how the outstanding loan and monthly interest payments fit into your wider financial plans.

A RIO mortgage could be a suitable mortgage choice if you:

• Have a reliable retirement income that can comfortably cover the monthly interest payments
• Want to keep an existing mortgage into retirement
• Want to release money from your home while keeping your monthly payments interest-only
• Are comfortable with the original amount borrowed remaining outstanding
• Are comfortable with the mortgage reducing the equity left in your home
• Understand how and when the outstanding mortgage will be repaid

On the other hand, a RIO mortgage may not suit you if the monthly interest payments would put pressure on your retirement income or if you’re planning on leaving as much equity as possible in your home for inheritance.

In the end, the right approach to your mortgage plans will depend on your income, borrowing needs, property and priorities for the future.

How Does a RIO Mortgage Compare With a Lifetime Mortgage?

Both RIO and lifetime mortgages are designed for later-life borrowing and allow you to borrow against the value of your home, without necessarily having a fixed date by which the mortgage must be repaid.

With that said, they are two different types of mortgages and work quite differently when it comes to monthly payments, affordability and how the interest can affect the amount you owe over time.

As we’ve explored throughout this guide, a RIO mortgage requires you to make monthly payments covering only the interest. As long as each of these payments is made throughout the duration of your mortgage, the original mortgage balance should remain unchanged.

On the other hand, a lifetime mortgage is a type of equity release. As a result, you can usually choose to make no monthly payments, with the unpaid interest instead being added to the mortgage balance. In this scenario, interest will then be charged on the increasing balance and the amount owed can grow over time.

To understand how these two mortgage options differ, let’s jump into a comparison and look at the main features of a lifetime mortgage vs retirement interest only mortgage:

As the table shows, the main differences come down to affordability and the outstanding mortgage balance over time.

With a RIO mortgage, you will need enough reliable retirement income to make the monthly interest payments, which prevents unpaid interest from increasing your mortgage balance.

By comparison, with a lifetime mortgage, you need to consider how the increasing mortgage balance could reduce the equity available to leave as inheritance.

Which option is most suitable for you will depend on your plans for the future. A mortgage adviser can help you compare the costs, affordability requirements and longer-term implications of each before you decide which approach best fits your retirement plans.

Which Lenders Offer RIO Mortgages?

If you’re asking “who offers retirement interest only mortgages?” then you’re more than likely to find that the RIO market looks quite different from a standard residential mortgage.

Rather than being offered by many of the mainstream mortgage providers you may be familiar with, RIO mortgages are available from a mixture of building societies and specialist lenders.

Below we have provided a snapshot list of RIO mortgage lenders currently available in the UK:

• Buckinghamshire Building Society
• Nottingham Building Society
• Cambridge Building Society
• LiveMore Capital
• Perenna
• Newbury Building Society
• Tipton & Coseley Building Society
• Leeds Building Society
• Scottish Building Society
• Penrith Building Society
• Hodge
• Bath Building Society
• Vernon Building Society
• Saffron Building Society
• Marsden Building Society
• Hanley Economic Building Society
• Family Building Society
• Beverley Building Society
• Mansfield Building Society

Knowing which lenders offer RIO mortgages is only the starting point. Each lender can set their own criteria and will often offer different interest rates, fees, LTV limits and product features.

This is where working with a whole-of-market mortgage broker can help. Rather than trawling through each lender and all the associated mortgage offers, a broker can specify and compare retirement interest only mortgages from across the market, quickly assessing which lenders and RIO mortgage products are most suitable for your circumstances.

How Can a Mortgage Broker Help With Borrowing in Retirement?

Borrowing later in life can involve a variety of different considerations from taking out a mortgage earlier in your working life. Your retirement income, age, property value and plans later in life will all influence the options available to you.

This is where experienced RIO mortgage brokers can help you understand what is available and which options could work for your circumstances.

At Boon Brokers, our expert advisers have whole-of-market access to more than 90 lenders and thousands of different mortgage products. We take a holistic approach to your mortgage needs, helping you:

• Understand your borrowing options: Explore RIO mortgages and other later-life borrowing options to understand which could work for your needs
• Assess your eligibility: Review your age, retirement income, affordability, property and LTV against different lender criteria
• Compare lenders and products: Search across the whole market to compare suitable mortgage rates, fees and product features
• Understand the costs: Breakdown the monthly payments, fees and longer-term costs associated with your mortgage
• Manage your application: Prepare and submit your application, communicate with the lender and keep you updated throughout the process

You will be assigned a dedicated mortgage broker who will manage your case from start to finish. Importantly, we will not simply focus on finding you a RIO mortgage. Your adviser can consider your wider borrowing needs and explain the options available to help you decide how best to move forward.

Our mortgage advice is completely fee-free, meaning you will not pay us a broker fee for our advice or for arranging your mortgage. We are here to help you understand your borrowing options and find a mortgage that works for your retirement plans.