Top tips to pick Fixed, Variable, or Split Loans

How lenders assess your income under each loan structure

Lenders calculate serviceability differently depending on whether you choose a fixed, variable, or split loan. For a variable loan, you're assessed at the current variable rate plus a buffer of 3.0 percentage points. For a fixed loan, the calculation uses the fixed rate you've selected plus that same buffer. A split loan applies both methods to the respective portions of your borrowing, which can create approval advantages or complications depending on your income documentation.

When you're self-employed, lenders typically require two full years of tax returns and financials. The income figure they use is often an average across those years, sometimes with adjustments for add-backs like depreciation. If your most recent year shows a dip in declared income, that average can work against you under a standard assessment. Consider a self-employed tradesperson applying for a $600,000 loan who declared $95,000 in the 2024-25 tax year but $110,000 the year prior. At current variable rates, the serviceability buffer might push the assessment rate above 6.0%. The income average of $102,500 may not clear the lender's minimum. In that scenario, locking in part of the loan at a lower fixed rate reduces the blended assessment rate and can shift the application from decline to approval.

Why split loans suit variable income patterns

A split loan divides your borrowing into two portions, one fixed and one variable, typically in proportions like 50/50 or 60/40. Each portion operates independently with its own interest calculation, repayment schedule, and account features. The variable portion usually comes with an offset account, while the fixed portion does not. For self-employed borrowers, this structure addresses two competing priorities: protection from rate rises during lean income years and flexibility to make extra repayments when cash flow improves.

In our experience, self-employed clients with seasonal income or contract-based work cycles prefer to hold 40 to 60 per cent of the loan as variable. That portion receives surplus income during high-earning periods, and the linked offset account keeps those funds accessible rather than locked into the loan. The fixed portion provides a known repayment commitment that can be budgeted around, even in months when work slows. A consultant working on government contracts might see six months of strong billings followed by a quieter patch. Fixing half the loan means half the repayment is predictable. The variable half absorbs lump sums without penalty and the offset reduces interest on that portion when funds sit idle.

Fixed loans and break costs

Fixed interest rates offer certainty over a set term, typically one to five years. The repayment amount stays the same regardless of what happens to the cash rate during that period. For self-employed borrowers, that certainty can be valuable during expansion phases or when taking on new debt for equipment or vehicles. The downside is rigidity. Most fixed loans cap extra repayments at $10,000 to $30,000 per year. Exceeding that cap or exiting the loan early triggers break costs, which are calculated based on the difference between your fixed rate and the lender's current wholesale funding cost. In a falling rate environment, break costs can run to tens of thousands of dollars on a standard loan size.

If your business income is lumpy or you anticipate a large inflow within the fixed term, such as a contract payout or asset sale, a full fixed loan creates a problem. You either pay the break cost to refinance or leave the surplus sitting in a separate account earning minimal interest while you continue paying a higher fixed rate. A split structure avoids this. Extra repayments go into the variable portion without penalty, and the fixed portion stays untouched unless you choose to break it. We regularly see self-employed borrowers who fixed the entirety of their loan during the rate rise cycle in late 2023 and early 2024 now facing five-figure break costs because their income recovered faster than expected and they want to pay down debt or refinance to access equity for investment.

Variable loans and rate discount retention

Variable loans adjust in line with the lender's standard variable rate, which moves up or down as the cash rate changes. Most borrowers receive a discount off the standard rate, expressed as a margin such as 0.80% or 1.20%. That discount is negotiated at the time of application and can vary significantly depending on your LVR, loan size, and whether you're an existing customer. For self-employed borrowers, maintaining that discount over time is important because lenders often price in higher perceived risk at the outset.

A variable loan gives you access to an offset account, which is a transaction account linked to your loan. The balance in the offset is subtracted from your loan balance when interest is calculated each day, but the funds remain available for business or personal use. If you hold $50,000 in an offset against a $500,000 variable loan, you only pay interest on $450,000. For a self-employed borrower, this is often more valuable than making extra repayments into the loan itself, because offset funds can be withdrawn instantly if a business expense arises or a client payment is delayed. Redraw facilities exist on some variable loans, but access can be restricted or delayed depending on the lender's policy.

One specific consideration is how lenders treat offset balances at fixed rate expiry. If you're on a split loan and your fixed term ends, the lender will typically roll that fixed portion onto a new variable rate unless you choose to refix. The new rate may not carry the same discount you negotiated years earlier. In some cases, lenders retain your original discount across the transition. In others, you revert to a higher standard variable rate with a reduced or nil discount, particularly if your loan size has decreased or your LVR has improved. That shift can add hundreds of dollars per month to your repayment. Monitoring the expiry date and negotiating renewal terms six to eight weeks in advance is standard practice.

Choosing the right split ratio for your cash flow

There is no universal split ratio. The decision depends on your income volatility, your capacity to absorb rate rises, and how much liquidity you need to retain for business operations. A 70/30 split in favour of variable gives you maximum flexibility and a large offset balance to work with, but exposes the majority of your loan to rate movements. A 30/70 split in favour of fixed locks in repayments on most of the borrowing but limits your ability to reduce interest through extra payments.

Consider a self-employed builder applying for a $550,000 owner-occupied loan. Their income over the past two years averaged $125,000, but monthly draw varies between $8,000 and $14,000 depending on project milestones. They fix 50 per cent at 5.89% for three years and hold the other 50 per cent variable at 6.19% with an offset. During high-income months, surplus funds go into the offset, reducing interest on the variable portion to near zero when the offset balance is high. During low-income months, the fixed portion repayment remains stable, and they draw from the offset if needed without touching the loan principal. Over three years, assuming an average offset balance of $35,000, the structure saves roughly $6,000 to $7,000 in interest compared to a full variable loan with no offset discipline, and provides protection against rate rises on half the debt.

A loan health check should be conducted at least every two to three years, or sooner if your income or business structure changes. Self-employed borrowers who transition from sole trader to company, bring on a business partner, or take on a commercial lease will often find their borrowing capacity shifts. A loan structure that worked at purchase may no longer align with your current financial position or goals.

When to refix and when to stay variable

The decision to refix part or all of your loan at the end of a fixed term depends on rate outlook, your income stability, and your debt reduction progress. If rates are falling or expected to fall, staying variable allows you to benefit from those reductions without being locked in. If rates are rising or stable and you value certainty, refixing makes sense. For self-employed borrowers, the calculus also includes your ability to make extra repayments and whether you expect significant cash inflows in the next one to three years.

If your business is entering a growth phase and you anticipate reinvesting profit into equipment, stock, or another property, keeping the loan variable or maintaining a higher variable split preserves flexibility. If your income has stabilised and you're focused on paying down debt without distraction, a higher fixed split removes the temptation to redraw and keeps repayments consistent. The key is to align the loan structure with your actual financial behavior, not with what you think you should be doing. Self-employed clients often overestimate their capacity to make extra repayments and underestimate their need for liquidity.

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