Variable Rate Investment Loans and Offset Accounts

Variable Rate Loans Give You Access to Offset Accounts

Variable rate investment loans let you attach an offset account, which reduces the interest charged on your loan without reducing the deductible balance. A 100 per cent offset account linked to a $500,000 investment loan with $40,000 sitting in the offset means you only pay interest on $460,000, but you can still claim interest deductions on the full $500,000 loan amount. Fixed rate loans don't offer offset accounts.

Consider a builder who owns a rental property with a $400,000 variable rate loan and keeps $30,000 in the linked offset account. At a variable rate around current levels, that offset balance saves roughly $1,500 to $2,000 per year in interest charges. Because the loan balance hasn't changed, the full interest expense on $400,000 remains deductible against rental income. The offset account doesn't reduce the loan amount for tax purposes or for calculating the loan-to-value ratio under lender risk-weighting rules.

If you're holding cash for materials, subcontractor payments, or upcoming works, an offset account on your investment loan keeps that money accessible while cutting the interest cost on your rental property debt. It's a different setup than using spare cash to pay down the loan directly, which would reduce your deductible interest and lock that cash away unless you redraw it.

The Trade-Off Between Offset Access and Rate Discounts

Variable rate loans with offset accounts typically carry a higher interest rate than equivalent loans without an offset. The rate difference varies across lenders but often sits between 0.10 and 0.30 percentage points. On a $500,000 loan, that's $500 to $1,500 extra per year in interest, which is fully deductible if the loan is used for investment purposes.

The offset makes sense if you regularly hold cash balances high enough to offset the rate penalty. If you're holding less than $20,000 on average in the offset account, the rate loading often costs you more than the offset saves. Running the numbers on your typical cash flow tells you whether the offset is worth it. Builders with uneven income, retention payments, or project-based cash flow often find more value in offset accounts than wage earners with steady fortnightly deposits.

You can access finance for tradies with or without offset features depending on what suits your cash position. Lenders won't force you into an offset product if it doesn't fit your borrowing pattern.

Interest-Only Repayments on Variable Rate Investment Loans

Most variable rate investment loans let you choose interest-only repayments for an initial period, typically up to five years. Interest-only means your monthly repayment covers only the interest charged, not any principal reduction. The loan balance stays the same, your repayments stay lower, and your deductible interest expense stays higher compared to principal-and-interest repayments.

A builder with a $450,000 investment loan on interest-only might pay around $2,200 per month in interest at current variable rates, compared to roughly $2,800 per month on principal and interest. That's $600 per month in extra cash flow, which you can direct toward your own home loan, business expenses, or building up the offset account. All the interest remains deductible as long as the loan is used to buy or hold the rental property.

Interest-only doesn't reduce the debt, so you're not building equity through repayments. You build equity if the property value increases or if you use surplus cash to pay down the loan voluntarily. For builders focused on holding rental property while clearing non-deductible debt or funding the next purchase, interest-only on the investment loan often makes more sense than paying down deductible debt.

How Offset Accounts Interact with Negative Gearing Rules

Offset account balances don't change your borrowing amount for negative gearing purposes. If your rental property is negatively geared, meaning the interest and holding costs exceed the rental income, you can claim the full loss against your other income, including building wages or business profit, for properties acquired before 12 May 2026. Properties acquired after that date are subject to different rules depending on when you bought and whether the property is an eligible new build.

A builder who bought an established rental property in early 2026 with a $380,000 loan, $25,000 rental income per year, and $32,000 in deductible costs including interest, rates, insurance, and management fees, can claim the $7,000 loss against salary or business income. Having $15,000 in the offset account reduces the interest charged but doesn't reduce the deductible loan balance, so the offset improves cash flow without cutting the tax deduction.

For properties acquired after 12 May 2026 that aren't eligible new builds, losses can only be offset against other residential property income from the 2027-28 income year onward. The offset account still reduces interest costs on a dollar-for-dollar basis, but the tax benefit of negative gearing is quarantined to residential property income only. That doesn't change how the offset account works, but it changes the value of preserving deductible interest.

Refinancing to Add or Remove an Offset Account

You can refinance an investment loan to add an offset account if your current loan doesn't have one, or move to a lower rate without an offset if you don't use it. Refinancing doesn't change the deductibility of the loan as long as the original borrowing was used to buy or hold the rental property. Lenders assess refinance applications under current serviceability rules, including the 3.0 percentage point buffer and debt-to-income limits that apply from February 2026.

Refinancing costs include discharge fees from your current lender, application fees or settlement fees with the new lender, and valuation costs. Some lenders cover valuation or application fees as part of a refinance offer, but discharge fees from your existing lender are usually unavoidable. If refinancing saves you 0.40 percentage points on a $500,000 loan, that's around $2,000 per year, which covers typical refinancing costs within the first year.

If you're refinancing to access equity for a deposit on another property, adding an offset account to the investment loan at the same time gives you a place to park cash between settlements without paying non-deductible interest. Timing the refinance to happen just before you need access to cash or just after a rate rise can maximise the benefit.

Variable Rate Loans and Borrowing Capacity for Portfolio Growth

Variable rate investment loans with offset accounts give you more flexibility when you're building a property portfolio, but they also increase your assessed repayments when applying for the next loan. Lenders assess your serviceability on the variable rate plus the 3.0 percentage point buffer, so a loan at 6.5 per cent is assessed at 9.5 per cent. Interest-only loans revert to principal-and-interest assessment if the interest-only period has less than three years remaining.

A builder earning $120,000 per year with a $400,000 investment loan on interest-only, a $500,000 owner-occupier loan, and $20,000 in rental income will be assessed on the buffered rate for both loans plus existing credit commitments and living expenses. The offset balance doesn't reduce the assessed loan amount. Debt-to-income limits cap new lending at six times total income for no more than 20 per cent of each lender's investor loans, so total borrowing above $720,000 may require a lender that hasn't yet hit that quarterly limit or a larger deposit to stay under the threshold.

Keeping your investment loan on variable with an offset gives you the option to park cash and reduce assessed interest costs when you apply for further borrowing, even though the serviceability test ignores the offset. That's a marginal benefit, but it adds up if you're near the edge of borrowing capacity.

When to Use Principal-and-Interest Instead of Interest-Only

Switching from interest-only to principal-and-interest on a variable rate investment loan reduces your debt over time and builds unencumbered equity, but it increases your monthly repayment and reduces your deductible interest expense. For builders who've cleared other debt, maxed out contributions to super, or don't plan to borrow again in the near term, paying down the investment loan can make sense.

In a scenario where a builder holds a $320,000 investment loan and has no other debt, switching to principal-and-interest at the end of the interest-only period means the loan is fully repaid over the remaining term, typically 25 years. Monthly repayments increase, but the total interest paid over the life of the loan drops significantly compared to staying interest-only and refinancing repeatedly. The tax deduction reduces each year as the loan balance falls, but the rental income eventually exceeds the interest cost, turning the property positively geared.

If you're planning to sell the property within five years, paying down the principal voluntarily doesn't deliver much benefit because you're repaying debt that would have been cleared at settlement anyway. Interest-only with an offset account lets you keep cash liquid and redirect it when the sale goes through.

Call one of our team or book an appointment at a time that works for you to talk through your home loans for tradies and whether an offset account fits your investment setup.

Frequently Asked Questions