How to Use Variable Rate Loans & Offset Accounts

Variable rate investment loans paired with offset accounts give you direct control over the interest you pay each month without locking you into a fixed term.

Property investors in Northcote benefit from this structure because it allows you to reduce interest costs when you have surplus cash while maintaining immediate access to those funds. The combination delivers flexibility that matters in a suburb where rental yields on period homes and newer townhouses can vary significantly, and where holding cash reserves for maintenance or vacancy periods is often necessary.

How a Variable Rate Investment Loan Works

A variable rate investment loan charges interest that moves in line with official cash rate changes and lender pricing decisions. When rates fall, your repayments decrease. When rates rise, your repayments increase.

Interest is calculated daily on the outstanding loan balance and charged monthly. Most lenders offer both interest-only and principal-and-interest repayment structures on variable rate investor loans. Interest-only periods typically run for one to five years, after which the loan converts to principal and interest unless you negotiate an extension. The interest you pay on an investment loan used to purchase or hold a rental property is deductible against your rental income and other assessable income, provided the property is rented or genuinely available for rent.

Consider a buyer who purchases a two-bedroom Edwardian cottage in Northcote as a rental property. They borrow on a variable rate with interest-only repayments for five years. During that period, the loan balance remains unchanged, but the monthly interest cost fluctuates each time the lender adjusts its variable rate. If the investor later decides to sell or refinance, there are no exit fees or break costs associated with repaying a variable rate loan early.

What an Offset Account Does for Investment Borrowing

An offset account is a transaction account linked to your investment loan that reduces the balance on which interest is calculated.

If you have a loan balance of $600,000 and $40,000 sitting in a linked offset account, you pay interest on $560,000. The offset is calculated daily and applied in full, so every dollar in the account reduces your interest cost from day one. The funds in the offset remain accessible at all times through normal banking channels, including transfers, direct debits and card withdrawals.

For investment loans, offset accounts create a tax advantage that savings accounts do not. Interest earned in a savings account is assessable income and must be declared to the ATO. Funds held in an offset account earn no interest, so there is no assessable income to declare. Instead, you receive the benefit as reduced interest expense on the loan, which increases your deductible interest and improves your after-tax position.

In our experience, investors who direct rental income, tax refunds and other surplus cash into an offset account rather than a savings account reduce their annual borrowing costs without giving up liquidity. This approach works particularly well for Northcote investors managing properties with periodic maintenance needs, such as roof repairs on older homes or strata levies on newer apartments.

Offset Accounts and Tax Deductibility

Funds in an offset account do not reduce your loan balance for tax purposes, so your deductible interest is calculated on the full loan amount minus the offset balance.

This distinction matters if you are claiming interest as a deduction. The ATO allows you to deduct interest on borrowings used to produce assessable income. If you have $600,000 borrowed for investment purposes and $40,000 in offset, you are only charged interest on $560,000, and that reduced interest charge is what you claim. The offset does not change the character of the loan or create any apportionment issues, provided the original borrowing was used entirely for investment purposes.

Where investors run into trouble is when they redraw funds from an investment loan or use offset funds for private purposes and then attempt to claim the full interest as a deduction. The deductibility of interest depends on the use of the borrowed funds, not the security provided. If you use offset funds to pay for a private holiday and then replenish the account with a redraw from the investment loan, the redrawn amount is not deductible because it was not used to produce assessable income.

Variable Rates Compared to Fixed Rates for Investors

Variable rate loans offer ongoing flexibility, while fixed rate loans lock in your interest cost for a set period, typically one to five years.

The choice depends on your cash flow stability, your view on interest rate movements, and how much value you place on certainty. Fixed rates do not allow offset accounts in most cases. Where a lender does permit an offset on a fixed loan, the benefit is often capped or limited, and early repayment or refinance during the fixed term triggers break costs that can run into thousands of dollars.

Variable rate loans let you make additional repayments or pay out the loan at any time without penalty. They also give you access to features such as offset accounts, redraw facilities and the ability to refinance your investment loan when a better rate or product becomes available. For investors in Northcote who may want to access equity for a second purchase or adjust their loan structure as their portfolio grows, a variable rate loan provides that flexibility without requiring you to wait for a fixed term to expire.

How Lenders Assess Investment Loan Applications

Lenders assess your capacity to service an investment loan by calculating whether you can afford the repayments at a rate higher than the actual product rate.

Under current APRA requirements, all authorised deposit-taking institutions must assess your ability to service a new loan at a rate at least 3.0 percentage points above the loan product rate. This buffer applies to both owner-occupied and investment lending. For investment loans, lenders also apply a rental income shading factor, typically using between 70 and 80 per cent of the expected rental income when calculating serviceability. This accounts for vacancy periods, maintenance costs and property management fees.

In addition to the serviceability buffer, lenders now apply a debt-to-income lending limit. From February 2026, no more than 20 per cent of new investment loans issued by any ADI can be made to borrowers with a total debt-to-income ratio of six times or greater. If your combined home and investment borrowing exceeds six times your gross annual income, some lenders may decline the application even if you meet serviceability requirements, or they may require a larger deposit to bring the loan within their portfolio limits.

For Northcote investors, this means your borrowing capacity depends not only on rental income and your existing income, but also on how much debt you already carry. If you are considering a second investment property or looking to increase your borrowing capacity, working with a broker who understands how different lenders apply these limits can make a material difference to the loan amount you can access.

Loan to Value Ratio and Lenders Mortgage Insurance

Most lenders require LMI on investment loans where the LVR exceeds 80 per cent.

LMI is a one-off premium calculated on the loan amount and LVR, and it protects the lender in the event you default. The premium is paid by you, either upfront or capitalised into the loan balance. LMI premiums on investment loans are higher than on owner-occupied loans at the same LVR, reflecting the higher risk weight applied to investor lending under APRA's prudential standards.

If you have a 10 per cent deposit, your LVR will be around 90 per cent once stamp duty and other purchase costs are included, and LMI will apply. Some lenders cap investment lending at 90 per cent LVR, while others will lend up to 95 per cent in limited circumstances. The size of the LMI premium increases sharply above 85 per cent LVR, so where possible, a 15 per cent deposit can reduce your upfront costs significantly.

Offset account balances do not reduce the loan amount for LVR purposes under the prudential standards, so even if you have $50,000 in offset on a $600,000 loan, your LVR is still calculated on the full $600,000 balance.

Using Equity to Fund Your Next Investment Purchase

If you own property in Northcote or elsewhere with available equity, you can use that equity as a deposit for your next investment purchase without selling the existing property.

Equity is the difference between the current market value of the property and the amount you owe on any loans secured against it. Lenders will typically allow you to borrow up to 80 per cent of the property's value without LMI. If your property is valued at $900,000 and you owe $400,000, your available equity is around $320,000, calculated as 80 per cent of $900,000 minus the existing loan balance.

You can access this equity by refinancing your existing loan or taking out a separate loan secured against the same property. The funds released can then be used as a deposit on the next purchase. If the borrowed funds are used to acquire an income-producing asset, the interest on those funds is deductible. If the funds are used for private purposes, the interest is not deductible, even though the loan is secured against an investment property.

This structure is common among Northcote investors who have held property in the area for several years and have seen capital growth provide additional borrowing capacity. A mortgage broker in Northcote can help you structure the lending so that each loan purpose is clearly documented and the tax treatment is preserved.

Interest-Only Repayments and Cash Flow Management

Interest-only repayments reduce your monthly loan cost during the interest-only period, but the loan balance does not decrease.

This structure suits investors who want to direct surplus cash toward other investments, offset accounts or a second property deposit rather than paying down the loan. At the end of the interest-only period, the loan reverts to principal and interest, and the repayment amount increases because you are now repaying both interest and principal over the remaining loan term.

For a Northcote investor holding a property with strong rental demand but modest rental yield, interest-only repayments can improve short-term cash flow and allow you to hold the property through periods where rental income does not cover all holding costs. The tax benefit of negative gearing under current rules allows you to offset those holding costs against your other income, provided the property was held or under contract before 12 May 2026 or is classified as an eligible new build.

From the 2027-28 income year, losses on established residential investment properties acquired after 12 May 2026 can only be offset against other residential property income, not against salary or wages. Excess losses can be carried forward. This change does not affect properties purchased before that date, but it does affect how you should structure new acquisitions if cash flow and tax planning are priorities.

When to Consider Refinancing Your Investment Loan

Refinancing an investment loan makes sense when you can secure a lower rate, access better loan features, or release equity for further investment.

Most variable rate loans do not carry exit fees, so the main cost of refinancing is the application fee charged by the new lender and any valuation or legal costs associated with the new loan. If the rate reduction is significant enough to recover those costs within 12 to 24 months, refinancing is usually worthwhile.

You should also consider refinancing if your current loan does not include an offset account and you are regularly holding surplus cash in a savings account. Moving to a loan with offset can reduce your interest cost and improve your tax position without requiring you to commit those funds to the loan permanently. If your circumstances have changed since you first borrowed, such as an increase in income, a reduction in other debts, or capital growth in your property, refinancing can also give you access to a higher loan amount or better serviceability assessment from a different lender.

Call one of our team or book an appointment at a time that works for you. Andor Financial works with investors across Northcote and the inner north to structure investment lending that aligns with your portfolio goals and cash flow needs.

Frequently Asked Questions