Retirement Interest Only (RIO) Mortgages

A Retirement Interest Only mortgage, usually shortened to RIO, is designed for older borrowers who can afford to pay the mortgage interest each month but may not want a conventional mortgage with a fixed capital repayment date.

How does a RIO mortgage work?

You borrow against your home and make monthly interest payments. Because the interest is normally paid as it falls due, the original capital does not increase through interest roll-up. The capital is usually repaid when a specified life event occurs, commonly when the last borrower dies, moves permanently into long-term care or the property is sold.

How is affordability assessed?

Unlike a typical roll-up lifetime mortgage, RIO lending requires an affordability assessment. Lenders may consider pension income, employment or self-employed income where permitted, investment income and other sustainable income. For joint applications, some lenders also assess whether the mortgage would remain affordable if one borrower died, so the treatment of survivor income can be important.

Is there a maximum age?

RIO criteria vary by lender. Some lenders have maximum ages at application while others are more flexible. Property type, loan-to-value, income and credit history can also affect which lenders are available. This is why an individual assessment is more useful than relying on a single age limit.

RIO versus a lifetime mortgage

The key difference is usually the payment commitment. A RIO normally requires monthly interest payments. Many lifetime mortgages have no mandatory monthly payment and allow interest to be added to the loan instead. That flexibility can reduce monthly outgoings, but roll-up interest increases the amount owed over time. Compare RIO and equity release.

Can a RIO repay an interest-only mortgage?

Potentially, yes. If an existing interest-only mortgage is reaching the end of its term, a RIO may be one route to investigate, provided the new borrowing is affordable and the property and application meet lender criteria. Other possibilities can include conventional interest-only or repayment borrowing, lifetime mortgages, using savings or downsizing. See the options when an interest-only mortgage ends.

Advantages to consider

• Paying the interest can keep the capital balance broadly level.
• There may be no conventional fixed repayment date, depending on the product.
• It can provide an alternative to equity release for borrowers with sufficient income.

Points to consider

• Monthly payments are mandatory and must remain affordable.
• Your home may be repossessed if you do not keep up repayments on a mortgage secured against it.
• Lender age, income and property criteria vary.
• The capital still has to be repaid eventually.

Reviewed by David Farrell, Later Life Lending Specialist. Last reviewed: 3rd October 2026.