RIO Mortgage vs Standard Interest-Only: What's Different
The single biggest difference: a standard interest-only mortgage has a fixed end date by which the full capital must be repaid. A RIO mortgage has no fixed end date at all — the capital is only repaid when you die or move into permanent long-term care, removing the repayment deadline entirely.
RIO and standard interest-only mortgages sound similar — both mean paying interest only, with the capital repaid later. But they're structured quite differently, particularly around when repayment happens and how affordability is assessed. Here's exactly what sets them apart.
The Core Structural Difference
A standard interest-only mortgage requires you to have a specific plan to repay the full capital by an agreed end date — an endowment policy, savings, or a planned property sale. If that plan falls through, you face the exact "mortgage maturity" problem covered in our other guides.
A RIO mortgage removes this deadline entirely — there's no fixed term for capital repayment. Instead, the loan simply continues, with interest paid monthly, until the property is eventually sold following death or a move into permanent long-term care. This structural difference is why RIO mortgages were created by the FCA in 2018 specifically as a regulated alternative for older borrowers.
How Affordability Is Assessed
Both products require proving you can afford the monthly interest payments, but the assessment differs in practice:
Standard interest-only mortgages typically assess affordability against your income at the point of application, with less specific focus on the exact retirement income picture years into the term
RIO mortgages specifically assess your retirement income — pension income, investments, or other reliable later-life income sources — since the loan is designed to run through retirement
This makes RIO mortgages, in some ways, more realistic for older borrowers to qualify for, since the assessment is built around retirement-stage income from the outset rather than treating it as an afterthought.
Interest Rates and Costs
RIO mortgage rates in 2026 typically sit in the 5-7% range — generally lower than lifetime mortgage (equity release) rates, though sometimes slightly higher than a standard interest-only deal would offer to a younger borrower, since lenders are pricing in the longer, undated nature of the loan.
Because there's no fixed end date, the total interest paid over a RIO mortgage's life depends entirely on how long you remain in the property — potentially many years — rather than a fixed, predictable term.
Which Suits Which Situation
A standard interest-only mortgage tends to suit younger borrowers with a genuine, specific repayment plan already in place — a maturing investment, planned inheritance, or intended sale at a known future date.
A RIO mortgage tends to suit older borrowers (typically 55+) who want the interest-only payment structure without the pressure of a fixed repayment deadline — often used specifically by those reaching the end of a standard interest-only term with no repayment plan, effectively converting an undated liability into a manageable ongoing arrangement.
Making the Choice
If you're approaching the end of a standard interest-only mortgage with no clear repayment plan, a RIO mortgage is one of the more realistic alternatives to consider alongside equity release and downsizing — provided you can comfortably afford the ongoing monthly interest payments long-term.
Read our full guide on RIO mortgage eligibility and affordability checks to understand whether you're likely to qualify.
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Not sure which option fits your circumstances?