How to Manage Risk and Protect Your Investment Loan

Managing risk on an investment loan starts with knowing how much repayment pressure you can carry if rates rise or the property sits empty. Lenders test this for you, but your own buffer matters just as much as theirs.

For Coorparoo investors, the aim is to build wealth through property without letting one bad year force a sale. This article covers how lenders assess risk, how to stress test your own numbers, and how recent tax changes affect your plan.

How Do Lenders Assess Risk on an Investment Loan?

Banks, credit unions and building societies must assess whether you can afford your loan at an interest rate at least 3.0 percentage points above the loan rate. This buffer applies to authorised deposit-taking institutions, and it applies to new borrowers.

Lenders also limit how much rent they count. APRA's guidance says prudent policies count no more than 80 per cent of expected rent, which allows for periods without a tenant. Rental appraisals are usually given less weight than actual rent received. Beyond that, each lender sets its own policy on the evidence of rent it accepts, so results can differ between lenders. A broker can compare these policies for your investment loan before you apply.

Since 1 February 2026, each bank can also lend only a set share of new loans at a debt-to-income ratio of six times or more. This is a limit on the bank's overall lending, not a cap on you. Non-bank lenders are not subject to it.

How to Stress Test Your Own Investment Loan Repayments

Stress test your loan by calculating repayments at a rate well above your actual rate, then checking you could cover them with no rent coming in for a stretch. The lender's buffer is a minimum, so your own test should be tougher.

As an example, consider a Coorparoo investor with a $600,000 loan on a 30-year principal and interest term. At the illustrative rate of 6.75% p.a., the monthly repayment is about $3,892. If the rate rose by 2 percentage points to 8.75% p.a., the repayment would be about $4,720. That is roughly $828 more each month, or about $9,900 over a year.

The investor decides to hold a cash buffer in an offset account covering several months of that higher repayment plus holding costs. When rates later rise, the rent and buffer together cover the higher repayment, so there is no pressure to sell. The trade-off is that cash sitting in the buffer is not working elsewhere. Use our loan repayment calculator to run your own numbers at different rates.

Interest Only vs Principal and Interest: What Changes the Risk?

Interest-only repayments lower your required payment for a set period but do not reduce the loan balance, so your debt stays the same while the term runs down. They also do not increase how much you can borrow.

When lenders assess an interest-only loan, APRA expects them to test repayments on a principal and interest basis over the remaining term only. A 30-year loan with a 5-year interest-only period is assessed over the remaining 25 years. That produces a lower maximum loan than an equivalent principal and interest loan.

Tax is also part of the picture. Interest on a loan used for a rental property is deductible when the property is rented or available for rent, under either structure. Only the interest part of a principal and interest repayment is deductible, and the principal part is not. Speak to your accountant about how this applies to you. The main risk of interest-only is that repayments rise when the period ends, because they are then spread over a shorter remaining term. Our fixed rate expiry page covers a similar repayment jump when fixed periods end.

Tax Rule Changes Every Property Investor Should Understand

Negative gearing rules now depend on when you bought the property. Losses on residential investment properties held at 7:30pm AEST on 12 May 2026, including those under contract, continue to be deductible against other income, such as salary, until the property is sold. Losses on eligible new builds acquired after that time can also be deducted against all income.

From the 2027-28 income year, net rental losses from established residential properties bought after that time can only be deducted against other residential property income, including residential capital gains. Excess losses can be carried forward. This does not change whether interest is deductible. It changes how a net rental loss can be used.

Capital gains tax is also changing. From 1 July 2027, the 50 per cent CGT discount is replaced by cost base indexation using CPI, with a 30 per cent minimum tax rate on real gains accruing from that date. Gains before that date are treated under the current rules. For a loan decision, this means a purchase that relied on a tax offset to stay affordable carries more risk. Your accountant can model how these changes apply to your situation.

How Equity Release Can Change Your Deductions and Risk

Releasing equity from an investment property increases your debt, and the tax treatment depends on what you do with the money. The ATO looks at how borrowed funds are used at the time of each drawdown, not at the security for the loan.

As an example, consider an investor who draws equity from a rental property in Coorparoo. They use part of it as a deposit on a second investment, and part to renovate their own home. Interest on the portion used for the second investment is generally deductible, while interest on the renovation portion is not. Keeping the two amounts in separate loan splits makes the records clear. The outcome is a tidy paper trail for the accountant and no mixed-purpose balance to untangle.

The trade-offs are a larger total debt and, if borrowing goes above 80 per cent of the property value, lenders mortgage insurance may be required. Each lender sets its own limits on equity release. A refinance review can show what is available, and the borrowing capacity page explains how lenders work out your limit.

What If You Struggle to Meet Repayments?

If you cannot meet repayments on a regulated investment loan held in your own name, you can tell your lender about it verbally or in writing. The lender then has 21 days to ask for more information or respond.

The lender must either agree to change the contract or tell you in writing that it refuses, with contact details for the Australian Financial Complaints Authority. Loans held by a company, or used mainly for business, are generally outside this protection. Contacting your lender early, and speaking to a broker, gives you more options than waiting until you fall behind.

Call one of our team or book an appointment at a time that works for you. DC Finance can review your current loan structure, test your repayments against higher rates and help you plan your next property purchase in Coorparoo. You can also start with a loan health check or visit our Coorparoo mortgage broker page.

Frequently Asked Questions