Variable Investment Loans and Offset Accounts Explained

Variable Rate Investment Loans and How They Work

A variable rate investment loan lets you borrow against property that you rent out, with interest charged at a rate that moves with market conditions. The rate changes when lenders adjust their pricing, which means your repayments can go up or down without you refinancing or switching products.

Most lenders calculate investor variable rates as their standard variable rate plus a margin that reflects the higher risk they attach to rental properties. That margin sits between 0.20 and 0.50 percentage points depending on your deposit, loan size and whether you hold other products with the lender. You will not see this margin listed separately. It is built into the advertised investor rate.

You can usually make extra repayments on a variable rate without penalty, though some products cap additional payments or charge exit fees if you refinance within a set period. If you are planning to use equity or pay down the loan ahead of schedule, confirm those limits before you settle.

Why Teachers Choose Variable Rates for Investment Properties

Variable rates give you room to adjust. If rental income increases or you receive a pay rise, you can direct extra funds into the loan without triggering break costs. That flexibility matters when you are building wealth through property and want to respond to changing circumstances without restructuring debt.

Consider a teacher who bought an investment unit and initially set repayments to match rental income. Twelve months later, the tenant renewed at a higher rate and the teacher redirected that increase straight onto the loan principal. Over two years, the additional payments reduced the loan by an extra amount that would otherwise have compounded at the investor rate. That would not have been possible under a fixed loan without paying break costs or waiting for the fixed term to expire.

Variable loans also suit investors who plan to use the offset account structure described below or who expect to refinance within a few years. Locking in a fixed rate only to refinance halfway through the term usually costs more in break fees than you save in rate certainty.

Offset Accounts and Why They Matter for Investment Loans

An offset account is a transaction account linked to your investment loan. Every dollar in the offset reduces the balance on which interest is calculated, without those funds being locked inside the loan itself. You can access the money whenever you need it.

If your loan balance sits at $400,000 and you hold $30,000 in the offset, you pay interest on $370,000. The interest saved equals the loan rate applied to the offset balance, which on an investment loan is usually higher than the interest you would earn in a savings account after tax.

For teachers with variable income from casual relief, tutoring or contract work, the offset provides a buffer. You can park funds between pay cycles or hold term break income without committing it to the loan permanently. That liquidity matters when your income fluctuates or when you need to cover vacancy periods, body corporate levies or urgent repairs.

Interest-Only Repayments on Variable Investment Loans

An interest-only period lets you pay just the interest component each month without reducing the principal. Most lenders offer interest-only terms of up to five years on investment loans, with the option to extend once if your circumstances still support it.

Interest-only keeps your monthly outgoings lower, which improves cash flow if the rent does not fully cover the loan cost. It also means more of your borrowing capacity remains available if you want to purchase another property before paying down the first loan. Under current APRA serviceability settings, lenders assess your ability to repay principal and interest at a rate three percentage points above the actual product rate. Holding an interest-only loan does not change that assessment, but it does mean your current repayment sits well below the test rate, leaving room in your assessed income.

From a tax perspective, every dollar of interest on a loan used to acquire or hold a rental property is deductible against rental income, provided the property is rented or available for rent. Paying down principal does not create a deduction. That is why many investors hold interest-only loans and direct surplus cash into an offset rather than paying down the loan itself. The offset reduces interest without reducing the deductible loan balance.

How the Offset Preserves Your Deductible Debt

When you make extra repayments directly onto an investment loan, you reduce the principal permanently. If you later redraw those funds for a private purpose such as a car, holiday or renovations to your own home, the interest on the redrawn amount is not deductible. The ATO treats the purpose of the borrowing, not the security, as the test for deductibility.

An offset avoids that problem. The loan balance stays unchanged, so the full amount remains deductible. The cash sits in the offset, reducing interest without altering the loan structure. If you need funds for a private expense, you withdraw from the offset and the loan balance is unaffected. If you need funds for another investment, you can withdraw from the offset or establish a separate loan, keeping each purpose isolated.

In our experience, this distinction catches teachers who treat an investment loan like a home loan and pay extra whenever they have surplus cash. Twelve months later they want to access that equity for a new purchase and find they have collapsed their deductible debt. Restructuring after the fact usually requires refinancing, which brings application costs, valuation fees and sometimes a higher rate if your circumstances have changed.

What Changed in July 2027 and Why It Matters Now

From 1 July 2027, net rental losses on residential investment properties purchased on or after 12 May 2026 can only be offset against rental income or carried forward. You cannot offset those losses against salary or wages. Properties held before that date continue under the old rules, and new builds that meet specific criteria remain exempt.

This changes the value of negative gearing for new purchases. If your rental property runs at a loss, that loss no longer reduces your taxable income from teaching. It sits quarantined until you have rental income to offset it against, or until you sell and apply it against the capital gain.

For teachers considering their first investment property or adding to a portfolio, this means cash flow matters more than tax offsets. A property that requires you to top up repayments each month now costs you after-tax dollars without delivering an immediate deduction. The offset becomes more valuable under this structure, because reducing interest directly improves cash flow rather than relying on a tax refund months later.

If you are buying a new residential dwelling that increases the number of homes on the site, the old negative gearing rules still apply. The legislation defines this narrowly. A knock-down rebuild that replaces one house with one house does not qualify. A subdivision that replaces one house with two townhouses does. The ATO has not yet released final guidance on how this applies to off-the-plan purchases or owner-builder arrangements, so confirm your position with a tax adviser before you exchange contracts.

How DTI Caps Affect Investment Borrowing from February 2026

Since 1 February 2026, lenders can only write 20 per cent of their new investment loans at a debt-to-income ratio of six times or more. This cap applies separately to investment and owner-occupied lending, and it is measured at the lender level across either a quarter or a rolling year depending on the institution's size.

If your total debt including the new investment loan sits at six times your gross income or higher, you may find fewer lenders willing to approve the application, particularly later in a reporting period when a lender is close to its 20 per cent threshold. This does not mean you cannot borrow above six times income. It means lenders ration those approvals and apply stricter serviceability tests when they do.

For a teacher earning $90,000 a year, six times income is $540,000. If you already hold a $400,000 home loan and want to borrow another $200,000 for an investment property, your total debt is $600,000 and you sit above the threshold. Some lenders will decline outright. Others will approve but apply a higher interest rate or require a larger deposit to bring your loan-to-value ratio down.

You can improve your position by increasing your income through a promotion or additional work, paying down existing debt before you apply, or adding a partner's income to the application if they are willing to go on title and guarantee the loan. Each approach has tax and legal implications, so work through the options with a broker and accountant before you commit.

Refinancing a Variable Investment Loan

Refinancing lets you move your investment loan to a different lender, usually to secure a lower rate, access better features or release equity for another purchase. Variable loans do not carry break costs, so you can refinance whenever the numbers justify the application and settlement fees.

Lenders reassess your income, expenses and serviceability when you refinance, using current rates and the three percentage point buffer. If your circumstances have changed since the original loan was approved, such as reduced hours, increased living costs or additional debt, you may not qualify for the same loan amount even though you have been meeting repayments without difficulty.

Refinancing an investment loan also gives you an opportunity to restructure. You might split the loan across two accounts, add an offset, switch from principal and interest to interest-only, or consolidate other debt if that improves your overall position. Each change affects your repayments, serviceability and tax treatment, so map out the outcome before you apply.

If you hold an investment property purchased before 12 May 2026 and you refinance after 1 July 2027, you retain access to full negative gearing provided the property remains continuously rented or available for rent. Refinancing does not reset the purchase date for tax purposes. The same applies if you increase the loan amount to fund improvements or to purchase another property, provided the additional borrowing is used for an income-producing purpose.

Borrowing Capacity and How Lenders Assess Investment Loan Applications

Lenders calculate your borrowing capacity by taking your gross income, adding a percentage of the expected rental income from the investment property, then subtracting your living expenses, existing debt repayments and the proposed new loan repayment. The proposed repayment is always tested at principal and interest over 25 or 30 years, even if you are applying for interest-only, and at a rate three percentage points above the actual product rate.

Most lenders add 75 to 80 per cent of the gross rental income to your income, not the full amount. This accounts for vacancy, repairs and periods where the property is between tenants. If the rental appraisal shows $500 per week, the lender will use $375 to $400 per week in the serviceability calculation.

Your deposit size also affects how much you can borrow. Lenders apply lower loan-to-value ratios to investment properties than to owner-occupied homes. Most cap investment loans at 90 per cent of the property value, and many tighten that to 80 per cent if your total debt is high or if you are purchasing in a regional or oversupplied area. Borrowing above 80 per cent usually requires Lenders Mortgage Insurance, which on investment loans costs more than on owner-occupied lending and is not tax deductible.

If you are a teacher with access to an LMI waiver for owner-occupied lending, that waiver does not extend to investment loans. The waiver applies only to your principal place of residence. You will pay LMI on an investment loan if your deposit sits below the lender's threshold, typically 20 per cent.

Using Equity to Fund Your Deposit

If you own property with available equity, you can borrow against that equity to fund the deposit and purchase costs for an investment property. The lender treats this as a top-up or separate loan secured against your existing property, and assesses your serviceability across both loans.

Releasing equity does not require you to sell your home or disrupt your current loan. You apply for an additional loan or increase, settle that loan, and use the funds to complete the investment purchase. The interest on the new borrowing is deductible provided the funds are used to acquire or hold an income-producing asset.

Lenders apply combined loan-to-value limits when you use equity. If you hold a home worth $600,000 with a $300,000 loan and want to borrow another $150,000 to fund an investment deposit, your total lending is $450,000 against a $600,000 property. That is a 75 per cent LVR, which most lenders will approve without LMI. If the combined lending pushes you above 80 per cent, LMI applies to the portion above that threshold.

The alternative is to sell assets, save from income or use an offset balance. Each option has different tax and cash flow consequences. Selling shares or managed funds may trigger capital gains tax. Drawing down an offset reduces your interest saving on the current loan. Saving from income delays the purchase. Work through the cost of each approach, including opportunity cost, before deciding.

What to Confirm Before You Apply

Before you lodge an application for a variable rate investment loan with an offset, confirm the lender's policy on interest-only approvals, LVR limits for investment lending, offset account fees, and whether extra repayments are capped or unrestricted. Not all lenders offer offsets on investment loans, and some charge monthly account fees that erode the benefit if your offset balance sits low.

Check how the lender calculates rental income in the serviceability assessment. Some lenders use 80 per cent of the rental appraisal. Others use 75 per cent, particularly if you are purchasing in an area with high vacancy rates or if the property is a studio or serviced apartment. The difference can reduce your borrowing capacity by tens of thousands of dollars.

If you plan to purchase a new build to retain access to full negative gearing, confirm with the vendor or their solicitor that the property meets the ATO definition before you exchange. Developers and real estate agents are not tax advisers and sometimes misstate what qualifies. The cost of getting this wrong is losing the ability to offset rental losses against your salary, which over a ten-year hold could amount to five figures in lost deductions.

Call one of our team or book an appointment at a time that works for you. We will confirm what you can borrow, which lenders suit your situation, and how to structure the loan and offset to match your goals without locking up liquidity or collapsing deductible debt.

Frequently Asked Questions