Interest Only Home Loans: What Australian Borrowers Need to Know

Interest only loans divide opinion among borrowers. Some see them as a smart tax strategy. Others view them as an expensive trap. Both can be right, depending on your circumstances.

Every mortgage repayment includes interest on the amount borrowed. With a principal and interest loan, part of each payment also reduces your loan balance. With an interest only loan, your repayments cover interest alone - the loan balance stays the same.

This difference shapes everything about how these loans work and who should use them.

How Interest Only Loans Work

Interest only periods typically last one to five years, though some lenders offer up to ten years. During this time, your repayments only cover the interest charged on your loan balance.

At the end of the interest only period, your loan automatically converts to principal and interest repayments. The remaining loan term is used to pay off the entire balance, which means higher monthly repayments.

Most lenders allow you to make extra payments during the interest only period, but this varies by lender and loan product. Some restrict additional repayments or charge fees for the privilege.

Interest Only Loans for Property Investors

Property investors often favour interest only loans because the interest on investment property debt is generally tax deductible. This creates a clear financial logic.

An interest only structure may support better cash flow for investors building a property portfolio. Lower monthly repayments free up capital for additional investments or other expenses.

The tax benefits can be significant. If you're paying 37% marginal tax, every dollar of deductible interest effectively costs you 63 cents. However, tax treatment varies - speak with your accountant before making decisions based on tax considerations.

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Interest Only Loans for Owner-Occupiers

Owner-occupiers receive no tax deduction for home loan interest. This makes interest only loans much less attractive for people living in their property.

The numbers tell the story clearly. Take a $500,000 loan at 4.78% over 25 years with an 80% LVR. LVR limits vary by lender and are subject to individual assessment. With principal and interest repayments from the start, you'll pay $357,766 in total interest. Add a 10-year interest only period and total interest jumps to $440,443 - an extra $82,676.

Some owner-occupiers choose interest only loans to keep initial repayments low, but this strategy rarely makes financial sense. You're paying a higher interest rate during the interest only period and creating a repayment shock when the loan reverts.

The Real Cost of Interest Only Loans

Interest only loans typically carry higher interest rates than principal and interest loans from the same lender. This rate premium varies but often adds 0.25% to 0.50% to your rate. Fees and rates vary by lender and are subject to change.

During the interest only period, you're not building equity through loan repayments. Your equity only grows if property values rise. If property prices fall, you could find yourself in negative equity.

When the interest only period ends, repayments increase substantially. Using the earlier example, monthly repayments on a $500,000 loan might jump from $1,992 during the interest only period to $3,200 when principal and interest repayments begin.

When Interest Only Loans Make Sense

Interest only loans suit borrowers who prioritise cash flow over equity building and can claim tax deductions on the interest. This typically means property investors.

They can also work for borrowers expecting significant income growth during the interest only period - perhaps professionals early in high-earning careers. But this strategy carries risk if income doesn't grow as expected.

Some borrowers use interest only loans as a temporary cash flow solution during major life changes like parental leave or business establishment. The key word is temporary - these loans should address specific short-term needs.

When to Avoid Interest Only Loans

Avoid interest only loans if you're an owner-occupier focused on paying off your home. The higher interest rates and longer repayment period will cost you significantly more over time.

Don't choose interest only loans simply to afford a more expensive property. This approach often leads to financial stress when repayments increase.

Avoid them if you're relying on property price growth to build equity. Property markets can fall as well as rise, leaving you with no equity gain and higher total interest costs.

Managing Interest Only Loans Effectively

If you choose an interest only loan, plan for the end of the interest only period before you sign the paperwork. Consider whether you'll refinance, extend the interest only period, or handle the higher repayments.

Many borrowers use offset accounts alongside interest only loans. Money in the offset account reduces the interest charged while keeping funds accessible. This strategy works particularly well for property investors managing multiple properties.

Consider making voluntary principal repayments during the interest only period if your cash flow allows. This reduces the loan balance and the eventual repayment shock.

Alternative Repayment Structures

Split loans let you combine interest only and principal and interest repayments on different portions of the same loan. You might put 70% on interest only and 30% on principal and interest, balancing cash flow with equity building.

Some lenders offer flexible repayment options that let you switch between interest only and principal and interest repayments without refinancing. Each lender sets their own criteria around eligibility, timing, and how often you can make these changes.

Making the Right Choice

Interest only loans aren't inherently good or bad - they're tools that suit specific situations. Property investors with clear tax strategies often benefit. Owner-occupiers rarely do.

Before choosing any repayment structure, consider your goals, cash flow, tax situation, and risk tolerance. A mortgage broker can help you compare options across multiple lenders and find structures that match your circumstances.

The key is matching the loan structure to your financial goals and circumstances. Interest only loans work best when you have a clear strategy for the interest only period and a solid plan for when it ends.

Consider your exit strategy before committing to an interest only loan. Will you sell the property? Refinance to extend the interest only period? Or absorb the higher repayments when the loan reverts to principal and interest?

Key Choice Lending has access to 72+ lenders and has supported Australian borrowers through more than $1 billion in transactions. Founder Matthew Clark is a two-time Amazon bestselling author and Better Business Award winner.

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