How you structure an investment loan matters more than what rate you pay
The way your investment loan is set up determines how much you can claim, how quickly you can act when the next opportunity comes up, and whether you keep control when income drops between contracts. A FIFO civil engineer earning $180,000 on a 14/7 roster might be approved for the same loan amount at the same rate from three different lenders, but the borrowing capacity, tax treatment and exit options can be completely different depending on how the loan is structured.
Interest only or principal and interest for investment property
Interest only repayments mean you pay only the interest charged each month and the loan balance stays the same. Principal and interest repayments reduce the loan balance over time. For a $600,000 investment loan at current variable rates, interest only repayments might sit around $2,700 per month while principal and interest repayments might be closer to $3,800. That $1,100 difference each month is capital repayment, not a claimable expense.
Interest only loans keep your claimable expenses higher and your monthly outgoings lower, which means more cash in hand during the holding period. That cash can go into an offset account against your home loan, reducing non-deductible interest on your own place while keeping the full investment loan balance deductible. Consider a civil engineer holding a rental property in Mackay with a $600,000 loan and a $400,000 home loan. Choosing interest only on the investment loan and redirecting $1,100 per month into an offset account on the home loan saves non-deductible interest and keeps the deductible debt intact.
Most lenders allow interest only periods of one to five years on investment loans, after which the loan converts to principal and interest unless you apply to extend. Extending interest only is not automatic. Lenders reassess your income, equity position and loan performance. FIFO workers between contracts or moving from permanent to contractor roles sometimes find it harder to extend interest only without recent payslips. If you want ongoing interest only access, build that into the structure from the start by selecting a lender that allows multiple renewals or setting up a line of credit facility rather than a standard term loan.
Ready to get started?
Book a chat with a Finance & Mortgage Broker at FIFO Home Loans today.
Variable rate or fixed rate for investment borrowing
Variable rate loans move with the market and usually allow full offset accounts, unlimited extra repayments and no break costs if you sell or refinance. Fixed rate loans lock your rate for a set period, usually one to five years, but most lenders either do not allow offset accounts on fixed investment loans or limit the offset benefit to a partial redraw facility. Extra repayments on fixed loans are capped, often at $10,000 to $30,000 per year, and paying out a fixed loan early triggers break costs if rates have fallen since you fixed.
For FIFO workers, variable rate investment loans with full offset are usually the better structure. Your income is high but irregular. Offset accounts let you park lump sums from end-of-year bonuses, shutdown payments or contract completion without losing access to the cash. A civil engineer on a 20/10 roster might receive $40,000 in bonus income in November and want that cash available in March when the next investment property comes up. Offset gives you full flexibility. Fixed loans do not.
Split loan structures, where part of the loan is fixed and part is variable, can work if you want some rate certainty but still need access to offset on the variable portion. The variable split is where you direct your surplus cash. The fixed split provides a floor under your repayments if rates rise sharply. We regularly see FIFO clients fix 40 to 60 per cent of the investment loan and leave the rest variable with offset attached.
Stand-alone loans or cross-collateralised structures
A stand-alone loan is secured against one property only. A cross-collateralised loan uses multiple properties as security for one or more loans, all linked within the same lender. Cross-collateralisation is common when you buy a second property and the lender takes security over both your home and the investment property to approve the new loan. It seems convenient at the time but it locks you in.
If you want to sell the investment property or refinance it to another lender, you need the bank to release that property from the security pool. That requires a full valuation, a credit assessment, and the lender's agreement to release. If your home has dropped in value or your income has changed, the lender can refuse the release and you are stuck. Stand-alone loans avoid that problem. Each property has its own loan and its own security. You can sell, refinance or restructure one property without touching the others.
Consider a FIFO civil engineer who bought a home in Townsville in 2023 with a $500,000 loan, then bought an investment property in Mackay in 2025 with a $650,000 loan, both with the same lender. The lender cross-collateralised both loans. In 2027, the engineer wants to sell the Mackay property and buy a larger investment in Brisbane. The bank requires a valuation on the Townsville home before releasing the Mackay property. The valuation comes in $50,000 below purchase price due to local market correction. The bank refuses the release unless the engineer repays $50,000 to bring the loan-to-value ratio back within policy. The sale is delayed, the opportunity is lost, and the engineer is locked in until enough principal is repaid or the Townsville property value recovers.
Stand-alone loan structures cost slightly more in application fees and valuation fees upfront because each property is assessed separately, but they preserve your flexibility. For FIFO workers building a portfolio over time, that flexibility is worth more than the saving.
Offset accounts and redraw facilities are not the same thing
An offset account is a separate transaction account linked to your loan. Every dollar in the offset account reduces the balance on which interest is calculated, but the loan balance itself does not change. You can deposit and withdraw from the offset account as often as you like with no impact on your loan structure or your ability to claim interest deductions. A redraw facility lets you withdraw extra repayments you have made into the loan. When you make an extra repayment, the loan balance reduces. When you redraw, the loan balance increases again.
For investment loans, offset accounts are almost always the right choice. Interest on borrowings used to purchase an investment property is deductible. Interest on borrowings used for private purposes is not deductible, even if the loan is secured against an investment property. When you redraw money from an investment loan and use it for private purposes, such as a holiday or a car, that portion of the loan is no longer deductible. The Australian Taxation Office applies a purpose test, not a security test. Offset accounts avoid that problem entirely because the loan balance never changes.
If you have $50,000 sitting in an offset account against a $600,000 investment loan, you pay interest on $550,000 and you can claim interest on $600,000 because the loan balance is still $600,000. If instead you paid $50,000 into the loan via redraw and then withdrew $50,000 to buy a car, your loan balance is back to $600,000 but only $550,000 of that is deductible. You have just permanently reduced your claimable interest by the portion used for private purposes. Offset accounts keep the loan structure clean and the deductions intact.
Line of credit versus standard term loan
A line of credit is a loan facility with a pre-approved limit that you can draw down and repay flexibly, similar to an offset account in reverse. You are approved for a maximum amount, you draw what you need when you need it, and you pay interest only on the drawn balance. A standard term loan gives you the full loan amount upfront, and you repay it over a fixed term of 25 or 30 years. Line of credit facilities suit FIFO investors who want to move quickly on opportunities without reapplying for finance each time.
Consider a civil engineer with $300,000 in equity across an existing home and investment property who wants to build a portfolio of three more properties over the next four years. A line of credit secured against the existing properties for $300,000 gives access to deposit and purchase cost funds for each new property without a new application each time. Each time a property is purchased, the line of credit is drawn further. Each time rental income builds up or a bonus is received, surplus cash can be parked in an offset account against the line of credit to reduce interest costs without losing access to the funds.
Line of credit interest rates are usually 0.3 to 0.7 percentage points higher than standard variable investment loan rates, and most lenders require annual reviews. FIFO workers between contracts or moving from employee to contractor status can find the annual review a problem if income evidence is not current. The structure works well when income is steady and the investment strategy is active. It works less well when income is irregular or the portfolio is in a passive holding phase.
Debt recycling to convert non-deductible debt into deductible debt
Debt recycling is a strategy where you use equity in your home to invest, then redirect the income and cash flow saved to pay down your non-deductible home loan faster while keeping the investment loan intact. The investment loan is deductible because it was used to purchase an income-producing asset. The home loan is not deductible. Over time, you shift your debt profile from non-deductible to deductible while building an investment portfolio. For a detailed breakdown of how the strategy works and the risks involved, see our full guide to debt recycling.
The structure requires careful documentation. You must be able to prove the borrowed funds were used to acquire the investment property, not for private purposes. That means separate loan accounts, clear funds flow from the loan account to the property settlement, and no mixing of borrowed funds with savings or offset balances. FIFO workers with lumpy income need to take extra care that bonus payments, allowances and irregular income are not accidentally mixed into the loan structure in a way that muddies the deductibility.
Loan structures and the February 2026 APRA debt-to-income limits
From 1 February 2026, banks can lend no more than 20 per cent of their new investment loans to borrowers with total debt exceeding six times gross income. A civil engineer earning $180,000 can borrow up to $1,080,000 in total debt before hitting the six-times threshold. That total includes the home loan, the investment loan, car loans, and any other debt. Income shading reduces the income figure used in the calculation. If your base income is $120,000 and your allowances and overtime add another $60,000, but the lender shades the $60,000 to 80 per cent, your assessed income is $168,000 and your six-times limit drops to $1,008,000.
If you are already above six times debt-to-income, the bank may reduce your maximum loan amount, increase the deposit required, or decline the application. Non-bank lenders regulated by the Australian Securities and Investments Commission are not subject to the same portfolio caps and can sometimes still approve loans that the major banks decline, although their rates are usually higher. Loan structure affects your debt-to-income ratio. Interest only repayments on investment loans lower your monthly commitments, which improves your serviceability assessment and can bring you back under the threshold. Offset accounts do not reduce the loan balance, so they do not help your debt-to-income ratio, but they do reduce the actual interest paid, which improves cash flow.
Building flexibility into your investment loan from day one
Flexibility means being able to sell without penalty, refinance without break costs, access your equity without reapplying, and keep your deductions intact when you move cash around. Variable rate loans with offset accounts and stand-alone security structures give you all of that. Fixed rate loans, cross-collateralised structures and redraw facilities do not. The rate you pay matters, but the structure you choose determines whether you stay in control when your income changes, when the market moves, or when the next opportunity comes up.
Call one of our team or book an appointment at a time that works for you. We will walk through your income structure, your current debt position, and the investment strategy you are working towards, then build a loan structure that fits your roster, your tax position, and your timeline.
Frequently Asked Questions
Should I choose interest only or principal and interest for an investment loan?
Interest only keeps your claimable expenses higher and frees up cash flow that you can redirect into an offset account against your home loan, reducing non-deductible interest. Principal and interest repayments reduce your loan balance but the capital portion is not tax deductible.
What is the difference between an offset account and a redraw facility on an investment loan?
An offset account reduces the interest charged without changing your loan balance, so your deductions stay intact. A redraw facility lets you withdraw extra repayments, but if you use redrawn funds for private purposes, that portion of the loan is no longer deductible.
What is cross-collateralisation and should I avoid it?
Cross-collateralisation means using multiple properties as security for your loans with the same lender. It makes it harder to sell or refinance one property without the lender's approval and a full reassessment. Stand-alone loan structures give you more flexibility to manage each property independently.
How do the February 2026 APRA debt-to-income limits affect FIFO workers applying for investment loans?
Banks can lend no more than 20 per cent of new investment loans to borrowers with total debt above six times gross income. FIFO workers often have income shaded by lenders, which reduces assessed income and can push borrowers over the threshold sooner. Non-bank lenders are not subject to the same caps.
Should I fix or keep my investment loan on a variable rate?
Variable rate investment loans usually offer full offset accounts, unlimited extra repayments and no break costs if you sell or refinance. Fixed loans lock your rate but restrict offset access and charge break costs if you exit early. For FIFO workers with irregular income, variable with offset usually offers more flexibility.
