Interest-Only Mortgages

🎯 When It Can Make Sense

Property Investors

Investors often use interest-only to keep payments low and cash flow positive, especially while relying on the property growing in value over time rather than paying the loan down. It can also have tax considerations for rentals, though those rules change, so check current advice.

Temporary Relief

A short interest-only period can give breathing room during a tight patch, such as a drop in income, while you get back on your feet. It is a tool to manage cash flow for a while, not a long-term plan for an owner-occupier.

Bridging and Construction

Interest-only also appears in bridging finance and during a build, where you are not yet living in or earning from the property. These are specific, time-limited uses, not a permanent structure.

⚠️ The Risks

The Debt Does Not Fall

The biggest risk is simple: at the end of an interest-only period you owe exactly what you started with. You have paid a lot of interest and reduced nothing. If property values fall, you could even owe more than the home is worth.

The Payment Jump When It Ends

When the interest-only period finishes, you usually switch to principal and interest over the remaining term. Because the full balance must now be repaid in less time, the payment jumps, sometimes sharply.

More Interest Overall

Because the balance stays high for longer, you pay more interest across the life of the loan than if you had been reducing the principal from the start. The lower payment now has a long-term cost.

Our Interest Only Mortgage Calculator shows the payment now and the jump later.

💡 Common Mistakes

Mistake 1: Using It Just to Afford a Bigger House

Interest-only can make a larger loan look affordable, but you are not reducing it, and the payment jump later can be unmanageable.

Mistake 2: Not Planning for the Switch

Many people are surprised when the period ends and the payment rises. Plan for the principal and interest payment well in advance.

Mistake 3: Relying Only on Capital Gains

Assuming the property will always rise is risky. If values fall while your debt stays flat, you can be left exposed.

Mistake 4: Treating It as Permanent for a Home

For an owner-occupier wanting to be debt-free, long-term interest-only undermines the goal. Use it deliberately and temporarily.

A Simple Approach

See our Mortgage Mastery guide. Final word: interest-only loans lower your payment now by not reducing the debt, which suits investors and short-term cash flow but costs more interest and ends in a payment jump. Use it with eyes open, plan for the switch, and for most homeowners aim to pay the loan down. This is general information, not advice; talk to a mortgage adviser.