Beginner's Guide to Variable Investment Loans & Offsets

How Variable Rate Investment Loans Differ from Fixed Loans

A variable rate investment loan charges interest that moves with the market, meaning your repayment amount can change when lenders adjust their rates. The main advantage is flexibility: you can make unlimited extra repayments, redraw funds when needed, and attach an offset account to reduce interest without locking your cash away.

Consider a business owner purchasing a rental property in Neutral Bay who needs to keep operating capital liquid while building a property portfolio. With a variable rate loan, surplus business income can sit in an offset account, reducing the interest charged on the investment loan while remaining available for immediate use if a client payment runs late or an opportunity emerges. That same flexibility does not exist with a fixed rate loan, where extra repayments are typically capped and offset accounts are rarely available.

The current legislative framework under APRA requires lenders to assess your borrowing capacity using a serviceability buffer of at least 3 percentage points above the actual loan rate. That buffer applies whether you choose variable or fixed. What differs is the rate itself: variable rates for investment loans typically start around 0.3 to 0.5 percentage points higher than equivalent owner-occupier variable rates, reflecting the higher capital treatment lenders must apply to investor exposures under APRA's Prudential Standard APS 112.

Why Offset Accounts Matter for Property Investors

An offset account is a transaction account linked to your investment loan where the balance reduces the interest charged on the loan without affecting the deductibility of that interest. Every dollar in the offset reduces the daily interest calculation by the same amount, which means a $50,000 offset balance against a $600,000 loan at 6.5 per cent saves you roughly $3,250 per year in interest.

The tax treatment is what makes offsets valuable for investors. Interest on borrowings used to acquire or hold a rental property remains fully deductible even when an offset account reduces the amount of interest you actually pay. You are not making a principal repayment, so the deductible loan balance stays intact. In our experience working with business owners across the Lower North Shore and nationally, this structure allows you to reduce holding costs without sacrificing the tax benefits that make property investment viable.

Offset balances do not reduce the loan amount for the purpose of calculating your loan-to-value ratio under APS 112, which means LMI requirements are based on the full loan amount regardless of how much sits in your offset. That distinction matters if you are trying to avoid LMI or planning to leverage equity for a second purchase down the line.

How the Negative Gearing Changes Affect Variable Rate Loans

For properties acquired on or after 7:30pm AEST on 12 May 2026, the rules around negative gearing change from 1 July 2027 under the Treasury Laws Amendment (Tax Reform No. 1) Act 2026. Net rental losses on these properties can only be offset against other residential rental income or carried forward. They cannot be deducted against salary, wages or business income.

This does not eliminate the value of a variable rate loan with an offset, but it does change the way you structure your finances. Instead of relying on tax refunds from negatively geared losses to fund holding costs, you need to ensure rental income covers expenses or that you have offset funds available to absorb the shortfall. A business owner generating irregular income can use the offset as a buffer, depositing surplus funds during profitable months and drawing them down when rental income falls short or a vacancy occurs.

Properties held before that date, including those under contract awaiting settlement, remain grandfathered under the old rules indefinitely. Variable rate loans are particularly useful during the transition period because they allow you to adjust your repayment strategy as the rules change without paying break costs or refinancing.

Interest-Only Repayments and Principal Build-Up

Most investment loans are written on an interest-only basis for the first one to five years, meaning you pay only the interest component each month and the loan balance does not reduce. This keeps your repayments lower and maximises the deductible interest you pay, which is useful if you are relying on tax deductions to offset holding costs.

Variable rate loans typically allow you to switch between interest-only and principal-and-interest repayments during the loan term without penalty. That flexibility matters if your circumstances change: rental income improves, you sell another asset, or you decide to pay down debt before retirement. You are not locked into a repayment structure for a fixed term.

Under APS 112, a long-term interest-only loan where the contractual interest-only period exceeds five years and the LVR is above 80 per cent is classified as non-standard, which means lenders apply higher capital requirements and may price the loan accordingly. Most lenders will approve interest-only terms up to five years on investment loans without moving into non-standard territory, and you can typically renew that interest-only period at the end of the term subject to serviceability.

Borrowing Capacity and the DTI Lending Limit

From 1 February 2026, APRA introduced a debt-to-income lending limit requiring that no more than 20 per cent of each lender's new investor loans be written at a DTI of 6 times gross income or higher. If your total borrowings across all properties exceed six times your household income, you may find some lenders unable to approve your application even if you meet serviceability.

This is particularly relevant for business owners whose income fluctuates or who structure their affairs to minimise taxable income. Lenders assess DTI using the income declared on your tax return or financials, not your cash flow. If you have been distributing profits as franked dividends or retaining earnings in a company structure, your declared income may understate your actual capacity, which can push you over the DTI threshold sooner than expected.

Variable rate loans do not change your DTI calculation, but the flexibility they offer can help you manage serviceability over time. If rates rise and your repayments increase, you can draw on offset funds to cover the difference without needing to refinance or restructure. That breathing room can be the difference between holding through a soft rental market and being forced to sell.

LVR, LMI and Deposit Requirements for Investors

Most lenders cap investment loans at 90 per cent LVR, meaning you need at least a 10 per cent deposit plus costs to proceed. If you borrow above 80 per cent LVR, you will pay LMI, which is calculated on a sliding scale and can add tens of thousands of dollars to your upfront costs. The premium is usually capitalised into the loan amount rather than paid separately.

LMI premiums are not tax-deductible in the year they are paid. The ATO treats them as a borrowing expense, which means the premium must be claimed over five years or the life of the loan, whichever is shorter. Some lenders offer LMI waivers for professionals in certain occupations, but those waivers rarely extend to investors regardless of your profession.

If you are using equity from an existing property to fund your deposit, lenders will assess the combined LVR across both properties. A common structure is to take out a small loan against your owner-occupied home to cover the deposit and costs, then take out a separate investment loan secured against the new property. That way, the interest on the investment loan remains fully deductible, while the interest on the equity loan used for the deposit is also deductible because it was used to acquire an income-producing asset.

When to Consider Refinancing a Variable Investment Loan

Refinancing an investment loan makes sense when you can secure a lower rate, access better loan features, or release equity for another purchase. Variable rate loans do not carry break costs, so you can refinance at any time without penalty beyond standard discharge and application fees.

Rate discounts on investment loans vary widely depending on your LVR, loan size and relationship with the lender. In our experience, business owners with multiple properties or significant offset balances can often negotiate deeper discounts, particularly if they consolidate their lending with one institution. A 0.3 per cent rate reduction on a $600,000 loan saves roughly $1,800 per year, which compounds over the life of the loan.

The loan health check process involves comparing your current loan structure against what is available in the market, reviewing your offset usage, confirming your interest deductions are maximised, and checking whether your LVR has improved enough to remove LMI on a new loan or access a lower rate tier. If you have held the property for several years and values have risen, your LVR may have dropped below 80 per cent even without making principal repayments, which opens the door to better pricing.

Call one of our team or book an appointment at a time that works for you. We work with business owners across Australia to structure investment loans that keep your capital accessible, your tax position optimised, and your portfolio growing without locking you into rigid loan terms that do not suit how you operate.

Frequently Asked Questions