Payments on Interest-Only Mortgages in Retirement: How RIO Payments Work
Written and reviewed by the Later Life editorial teamUpdated 5 min read
Payments on an interest-only mortgage, such as a retirement interest-only (RIO) mortgage, cover only the interest, not the amount you borrowed. The monthly figure depends on the size of the loan and the interest rate. If you miss a payment, you fall into arrears, and your lender must follow FCA rules on how it treats you.
For how a retirement interest-only mortgage works overall, see our main guide. This page focuses on the monthly payment: how it is calculated, what can change it, and what happens if a payment is missed. We do not provide financial advice.
How payments on an interest-only mortgage are worked out
The basic sum is simple. Take the amount borrowed, multiply it by the yearly interest rate, and divide by 12. That gives the monthly interest. Because none of the payment goes towards the loan itself, the balance stays the same. So the payment stays the same for as long as the rate does.
A simple way to see the effect of the rate
For illustration only: every 1 percentage point of interest on £100,000 borrowed adds about £83 a month (£100,000 × 1% ÷ 12 = £83.33). A change of half a percentage point on the same loan moves the payment by about £42 a month. These are not market rates or rates any lender is offering. They simply show how the sum works.
A repayment mortgage would include part of the loan in each payment, so for the same loan and rate its payments would be higher. That is one reason RIO payments can feel manageable. The trade-off is that the loan is never reduced, so it must still be repaid when the mortgage ends.
What can change your payment
- A fixed rate ending. When a fixed-rate deal ends, the rate usually moves to another rate, often the lender's standard variable rate, unless a new deal is arranged.
- A variable rate moving. If the rate is variable, the payment rises or falls with it.
- Changing the loan. Borrowing more raises the payment. Repaying part of the loan, where your terms allow it, lowers it.
Lenders check that you could still afford the payments if rates rose. Our guide to how the lender tests affordability explains what they look at.
Paying each month
Payments are usually made monthly, often by direct debit. Some borrowers keep savings aside to cover a few payments, in case income drops or a large bill arrives. For joint borrowers, lenders look at whether the payment could be met on one income, as pensions can fall when a partner dies.
Predictable monthly costs are one of the RIO mortgage benefits for older homeowners. They only stay predictable, though, if the payment continues to fit your budget for the rest of your life.
What happens if you miss a payment
Arrears and the lender's first steps
A missed payment puts the account into arrears. Under FCA rules, a lender must write to you within 15 business days of becoming aware of the arrears. The letter must include details of the charges you are likely to face and a copy of MoneyHelper's "Problems paying your mortgage" information sheet.
The rules also say lenders must deal fairly with customers in payment difficulty. They must make reasonable efforts to agree a way of clearing the arrears, and must not repossess a home unless all other reasonable attempts to resolve the position have failed.
Why payments matter so much on a RIO mortgage
A RIO mortgage has no fixed end date, but that depends on the interest being paid. The FCA's definition says the lender cannot ask for the whole loan back before a life event such as death or a move into care, unless the borrower breaks the contract, including by not paying interest. Missed payments can also add charges and affect your credit record.
Your home may be repossessed if you do not keep up repayments on your mortgage.
Where help is available
- Your lender. MoneyHelper's guidance is to contact your lender as soon as possible if a payment may be missed.
- Free debt advice. MoneyHelper and Citizens Advice offer free, confidential help.
- A benefits check. This can show whether you are entitled to extra income, such as Pension Credit.
- Your housing options. For some people, downsizing could release money and remove the need for monthly payments, although moving has its own costs.
When the payments stop
Payments end when the mortgage ends. That is usually when the home is sold, the last borrower dies, or the last borrower moves permanently into long-term care. At that point the loan itself is repaid, usually from the sale.
If monthly payments are the main concern, it may help to understand how equity release differs. A lifetime mortgage usually has no monthly payments, but interest is added to the loan and the debt grows over time.
Not sure where to start?
An FCA-regulated mortgage adviser can work through what the payments would be for your loan, and how they might change. If you are already struggling, MoneyHelper offers free, impartial guidance and can point you to debt advice. We do not provide financial advice.
Frequently asked questions
Do RIO mortgage payments go down over time?
Not usually. Because each payment covers only the interest, the amount you owe stays the same, so the payment only falls if the interest rate falls or you repay part of the loan. On a variable rate the payment can go up or down. On a fixed rate it stays the same until the fixed period ends.
Can I pay extra each month on a RIO mortgage?
Some lenders let you overpay, which reduces the loan and so lowers future interest payments. Others limit how much you can repay, or charge early repayment charges, particularly during a fixed-rate period. The terms are in your mortgage offer. Check them, or ask the lender, before sending extra money, so you know how it will be treated.
Will one missed RIO payment lead to repossession?
One missed payment does not usually lead straight to repossession. FCA rules require lenders to treat customers in payment difficulty fairly, try to agree a practical way to clear the arrears and take repossession action only when other reasonable attempts have failed. Missed payments can still bring charges and affect your credit record, so contacting the lender early usually leaves more options open.
Who can help if I am struggling to pay my RIO mortgage?
Your lender is the first contact, as it may be able to agree a payment arrangement. Free, confidential debt advice is available through MoneyHelper and Citizens Advice. A benefits check may show whether you are entitled to extra income, such as Pension Credit. An FCA-regulated mortgage adviser can look at whether a different mortgage or another option might fit your circumstances.
How do I work out the monthly interest on a RIO loan of a different size?
Multiply the amount borrowed by the yearly interest rate and divide by 12. For illustration only, and not a rate any lender is offering, each 1 percentage point of interest on a £50,000 loan works out at about £42 a month (£50,000 × 1% ÷ 12 = £41.67). The mortgage illustration, known as the ESIS, shows the actual monthly payment for a specific loan and rate.
