Refinancing an investment property follows the same broad steps as refinancing your home, but lenders look at it through a different lens. Investor loans are priced differently, the rent has to be verified and shaded, interest-only terms come up for renewal, and the tax treatment of the debt can change depending on how the new loan is set up. With lender policy on investors shifting through 2026, those differences have more impact on the outcome than they did a year ago.
Investor Loans Are Priced Separately
Most lenders publish separate rate cards for owner-occupied and investment loans, and investor rates are usually higher. Interest-only investment loans often carry a further loading on top of that. A refinance that looks attractive on an owner-occupier rate card may look quite different once the investor pricing is applied, so the comparison needs to be made on the right product.
The gap between lenders can also be wider for investors, because lenders adjust investor pricing to manage how much investment lending they write. That creates room for a meaningful saving when refinancing, but only when the comparison is like for like.
How Lenders Assess Serviceability for Investors
When you refinance an investment loan, the new lender assesses the full application again. Rental income is usually counted at around 75% to 80% of the gross rent, and the loan repayment is assessed at the interest rate plus a buffer of at least 3 percentage points at lenders regulated by APRA.
The treatment of negative gearing in serviceability has become more varied since the May 2026 Budget changes for established properties. Some lenders still factor in the tax benefit for properties purchased before the Budget, while others have narrowed what they count. Two investors with the same property and income can therefore get different results depending on where they apply.
Can an Investor Refinance Without Passing the Full Serviceability Test?
Sometimes. APRA has confirmed lenders can approve some refinances as exceptions to their standard serviceability test, typically where the borrower has a good repayment history and the new loan lowers repayments. Many lenders apply this flexibility mainly to owner-occupied loans, so investors may find fewer lenders willing to use it.
When the Interest-Only Period Ends
Many investment loans start with an interest-only period of up to five years. When it ends, the loan switches to principal and interest over the remaining term, which can lift repayments sharply because the same balance now has to be repaid over fewer years.
Investors often look at refinancing at this point to secure a new interest-only period or a better rate. A new interest-only term requires a fresh assessment, and lenders will test whether you could afford principal and interest repayments over the remaining term once the new interest-only period ends. Some lenders also cap the total number of interest-only years they will allow on one loan.
Loan Structure and Tax Deductibility
Interest on an investment loan is generally deductible because of what the original borrowing was used for. Refinancing the same debt to a new lender usually keeps that link intact, but adding extra borrowing for private purposes, such as a car or renovating your own home, in the same loan can mix deductible and non-deductible debt.
Keeping any new borrowing in a separate loan split makes the purpose of each part clearer. The tax rules in this area are complex, and a registered tax agent or accountant is best placed to confirm how a particular refinance affects your deductions.
Valuations, LVR and Security
Investment properties go through the same valuation process as a home, but lenders may apply tighter maximum LVRs to investors, and some restrict lending on certain property types such as small units, high-density apartments or properties in specific postcodes. If values in your area have fallen, the new valuation can push the LVR above 80%, which may mean a fresh lenders mortgage insurance premium.
Refinancing is also a chance to review how properties are secured. If several properties sit with one lender under a cross-collateralised structure, moving to standalone loans can make future sales and refinances simpler, although each property then needs its own valuation and loan.
Costs to Factor In
The costs are similar to an owner-occupier refinance: discharge fees, government registration fees, and break costs if any part of the loan is fixed. For investors, some of these costs may be deductible or added to the cost base of the property, which is another reason to involve an accountant before committing.
Adding every cost together and comparing it with the interest saving over two to three years shows whether the switch makes financial sense, particularly when the rate difference is small.
Key Takeaways
- Investment loans are priced separately from owner-occupied loans, and interest-only investor loans often carry a further loading.
- Lenders usually count around 75% to 80% of rent and assess the loan at a buffered rate when you refinance.
- Negative gearing treatment in serviceability has become more varied since the May 2026 Budget changes.
- The end of an interest-only period is a common trigger to refinance, but a new interest-only term needs a fresh assessment.
- Adding private borrowing to an investment loan can mix deductible and non-deductible debt, so separate splits keep it clearer.
- Refinancing can be a chance to unwind a cross-collateralised structure into standalone loans.