How to Use Fixed Rates and Offset on Investment Loans

Can You Have an Offset Account on a Fixed Rate Investment Loan?

Most lenders do not allow offset accounts to be linked to fixed rate investment loans. The fixed rate product locks in your interest cost for a set term, and allowing an offset would reduce the lender's ability to manage that cost. You can usually have an offset account on a variable rate investment loan, but adding a fixed rate portion to your investment loan structure means that portion will not benefit from offset.

This is different from owner-occupier lending, where some lenders do offer offset on fixed rate home loans. The offset facility on fixed rate investment products is rare because investment borrowing attracts different prudential capital treatment under APS 112, and lenders price the product accordingly.

Why Offset Accounts Matter for Paramedics Building Wealth

Paramedics earning shift penalties and overtime allowances often hold larger cash reserves than borrowers on fixed salaries. Those reserves can sit in an offset account linked to a variable rate investment loan, reducing the daily interest charged without reducing loan deductibility.

The interest you pay on an investment loan is deductible against rental income and, for properties held before May 2026, against your salary under negative gearing rules. When you put cash into an offset account, you pay less interest but you still claim the full loan balance as a deduction. The loan balance does not drop, so your deduction does not drop either.

Consider a paramedic holding $40,000 in savings and a $500,000 variable rate investment loan at current variable rates. With the offset account linked, interest is charged on $460,000 instead of $500,000. The tax deduction still applies to the full $500,000 loan. The offset reduces what you pay, but not what you claim.

How Fixed Rates Work on Investment Loans

A fixed rate investment loan locks your interest rate for a chosen term, typically between one and five years. During that period, your repayments do not change, even if the Reserve Bank moves the cash rate or lenders adjust their variable products.

Fixed rates suit paramedics who want certainty around repayment budgets or who expect rate rises during the fixed term. The downside is limited flexibility. Most fixed rate products cap extra repayments at $10,000 to $20,000 per year without penalty, and you cannot redraw those payments. Offset accounts are not available, so any surplus cash sits outside the loan structure and does not reduce your interest cost.

Under APS 112, both fixed and variable rate investment loans attract higher risk weights than owner-occupier loans at the same LVR, which flows through to pricing. Fixed rate investment products are priced using swap rates and the lender's cost of funding, not just the cash rate.

The Split Loan Strategy for Paramedics With Surplus Cash

A split loan structure divides your total borrowing into two portions: one fixed, one variable. The variable portion can have an offset account linked to it. The fixed portion provides rate certainty. You control the size of each portion based on your cash position and rate outlook.

In a scenario where a paramedic borrows $600,000 to purchase an investment property, they might fix $400,000 for three years and leave $200,000 variable with offset. If they hold $50,000 in reserves, the offset account reduces the effective variable loan to $150,000. The fixed portion remains unchanged. Total interest is calculated on $550,000 instead of $600,000, but the tax deduction still applies to the full $600,000.

This structure works when you expect to hold surplus cash but still want protection against rate rises on the majority of the loan. It does not work if you plan to use all your cash for other purposes, because the offset account provides no value when empty.

Interest Only Repayments and Investment Loan Cashflow

Most investment loans for paramedics are structured as interest only loans for the first one to five years. You pay only the interest portion each month, not the principal, which keeps repayments lower and preserves cashflow.

Interest only suits investors who want to maximise tax deductions and redirect surplus income into other investments or into paying down non-deductible debt such as an owner-occupier home loan. After the interest only period ends, the loan reverts to principal and interest repayments, and the term shortens accordingly.

Under APS 112, a long-term interest only residential loan with an LVR above 80 per cent and a contractual interest only period greater than five years is classified as non-standard, which attracts a higher risk weight and typically higher pricing. Most lenders cap interest only terms at five years on standard investment products.

If you refinance before the interest only period ends, you can typically negotiate a new interest only term with the new lender, subject to serviceability. Investment loan refinancing can also be used to access equity or shift from a fixed rate to a variable rate structure as your circumstances change.

Serviceability and the DTI Limit for Investment Borrowing

Lenders assess your ability to service an investment loan at a rate at least 3.0 percentage points above the loan product rate. That buffer has been in place since October 2021 and applies to all new borrowing from ADIs.

From February 2026, APRA introduced a DTI lending limit that restricts each ADI to lending no more than 20 per cent of new investor loans to borrowers with a total DTI ratio of six times or greater. Your total DTI includes all debt, both owner-occupier and investment, divided by your gross annual income.

For a paramedic earning $110,000 including penalties and allowances, a DTI of six times would be $660,000. If you already hold $400,000 in owner-occupier debt, the lender can approve up to $260,000 in additional investment borrowing before you reach that threshold, assuming no other debt. Borrowing above six times DTI is still possible, but it falls within the lender's 20 per cent cap and is subject to tighter assessment.

The DTI limit applies separately to owner-occupier and investor lending portfolios, and it applies only to new lending. Existing loans are not affected. Bridging loans and loans for new dwelling construction are excluded from the limit.

LMI and Investor Deposit Requirements

Most lenders require a minimum 10 per cent deposit for investment loans, meaning you can borrow up to 90 per cent LVR. Borrowing above 80 per cent LVR triggers LMI, which is calculated on the loan amount and LVR and added to your loan balance or paid upfront.

Some lenders offer LMI waivers for paramedics on owner-occupier loans, but those waivers typically do not extend to investment lending. LMI on a $540,000 investment loan at 90 per cent LVR can range from $15,000 to $25,000 depending on the insurer and lender.

Under APS 112, offset account balances do not reduce the loan amount for LVR calculation purposes. If you borrow $540,000 and hold $50,000 in an offset account, your LVR is still calculated on the full $540,000 loan.

Rental Income and Vacancy Rate Assumptions

Lenders typically assess rental income at 80 per cent of the market rent, applying a 20 per cent vacancy rate buffer even where the property is tenanted. That income is added to your salary when calculating serviceability, but the reduction accounts for periods without a tenant and ongoing holding costs.

If a property generates $600 per week in rent, the lender will assess $480 per week as income for serviceability purposes. That rental income helps offset the loan repayment cost and improves your capacity to borrow, but it does not eliminate the need for salary income to support the application.

For paramedics looking to buy your first investment property, rental income assumptions are critical to structuring the loan within serviceability limits, particularly where you are also servicing an owner-occupier mortgage.

Tax Deductions and Claimable Expenses

Interest on an investment loan is deductible against rental income and, for properties held before May 2026, against salary and wages under negative gearing rules. From the 2027-28 income year, losses on established investment properties purchased after May 2026 can only be offset against other residential property income, not salary.

Other claimable expenses include council rates, water charges, insurance, property management fees, repairs and maintenance, and depreciation on plant and equipment. Body corporate fees are deductible for units and townhouses. Stamp duty and legal fees are not immediately deductible but are added to your cost base for CGT purposes.

Interest paid on a fixed rate investment loan is deductible in the same way as interest on a variable rate loan. The loan structure does not change the deduction. What matters is that the borrowing was used to acquire or hold the investment property and that the property is rented or genuinely available for rent.

Call one of our team or book an appointment at a time that works for you. We structure investment loans for paramedics across Australia and work with lenders who understand shift-based income and portfolio growth strategies.

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