Key Takeaways
- Fixed-rate commercial loans lock in the interest rate for an agreed period (typically 1 to 5 years), providing certainty in repayment amounts but limited flexibility.
- Variable-rate commercial loans move with the broader interest rate environment, offering flexibility and the chance to benefit from rate falls, but no certainty around future repayments.
- Break costs on fixed-rate loans can be substantial if the loan is repaid or refinanced early during the fixed period.
- The right structure depends on the borrower’s cash flow priorities, view on rate movements, and how likely they are to refinance or restructure during the fixed period.
The Cash Flow Question Behind the Choice
Commercial borrowers in Australia choosing between fixed and variable interest rates are essentially weighing certainty against flexibility. Fixed rates lock in the cost of borrowing for an agreed period; variable rates move with the broader market over time. The choice shapes monthly cash flow predictability, exposure to rate movements, and the practical ability to make changes to the loan during its life.
This article focuses on the cash flow dimension specifically, which is the lens most commercial borrowers care about most. For a business operating on tight margins, knowing the exact monthly repayment for the next 5 years can be worth more than the possibility of a slightly lower rate. For a business with flexible cash flow and a planned refinance in 18 months, locking in for 5 years can create costly problems. Hence, the right answer depends on the borrower’s specific cash flow profile and plans, not a universal rule about which structure is better.
This guide compares fixed and variable commercial loans across the dimensions that matter most for cash flow planning: certainty, flexibility, break costs, refinancing options, and the situations where each structure typically fits. If you want to model both options against your specific situation, the commercial finance team at Loanworx can run the comparison alongside current lender pricing for fixed and variable rates.
How Each Structure Works
Before comparing the two on cash flow terms, the mechanics of each structure are worth setting out clearly. Both apply across commercial property, business, and equipment finance, although the typical fixed periods and rate spreads vary by product.
Fixed Rate Commercial Loans
A fixed rate commercial loan locks in the interest rate for an agreed period, typically 1 to 5 years, with some lenders offering longer fixed terms for property loans. During the fixed period, the rate does not change regardless of what happens to market rates. The repayment amount stays constant (for principal-and-interest loans) for the fixed period. At the end of the fixed period, the loan usually reverts to a variable rate (or can be re-fixed for another period).
Variable Rate Commercial Loans
A variable rate commercial loan has an interest rate that moves with the lender’s reference rate, which broadly tracks the Reserve Bank of Australia (RBA) cash rate and the lender’s funding costs. When rates rise, the borrower’s rate (and repayment) rises with them. When rates fall, the borrower benefits. The repayment amount changes through the loan’s life, sometimes multiple times in a year, depending on what the broader rate environment is doing.
Split Loans
Some commercial borrowers split their loan between fixed and variable portions, often 50/50 or 70/30. This produces a hybrid cash flow profile: predictability on the fixed portion, flexibility on the variable portion. Splits are particularly common for larger loans where the borrower wants some certainty without committing the full loan amount to either structure.
The Worked Example This Article Uses
To compare the two structures concretely, the figures below use a $800,000 commercial property loan at 6.25% over 15 years on principal and interest. The monthly repayment at 6.25% is approximately $6,864. The same loan at 5.25% would be approximately $6,432; at 7.25% it would be approximately $7,306. These reference points anchor the cash flow scenarios discussed below.
Comparison 1: Certainty in Repayments
Certainty is the most visible difference between the two structures and the one cash-flow-conscious borrowers usually focus on first.
Fixed Rate Certainty
Fixed rate loans deliver complete certainty in repayment amounts for the fixed period. On the worked example, a 5-year fixed at 6.25% produces a known monthly repayment of $6,864 for 60 months. The borrower can plan business cash flow, set budgets, and forecast profit margins with the confidence that the loan repayment will not change during the fixed period. For businesses with thin margins or seasonal cash flow, this certainty has direct operational value.
Variable Rate Uncertainty
Variable rate loans expose the borrower to repayment changes whenever the underlying rate moves. On the worked example, a 1% rate increase pushes the monthly repayment from $6,864 to approximately $7,306, an increase of around $442 per month or $5,300 per year. A 1% decrease drops it to around $6,432, a saving of $432 per month. The repayment can shift in either direction multiple times within a year.
The Certainty Premium
Lenders typically charge a small premium for fixed rates relative to variable rates, although the relationship depends on market expectations. In environments where the market expects rates to fall, fixed rates often price below variable. When the market expects rates to rise, fixed rates usually price above variable. The premium (or discount) is the market’s collective view on where rates are heading; borrowers locking in a fixed rate are effectively betting against that view.
The Cash Flow Implication
Certainty is most valuable to borrowers whose cash flow has limited room for variation. A business operating at 5% net margin has very different exposure to a 1% rate increase than a business operating at 25% net margin. Certainty has objective value; whether it is worth the trade-offs depends on the borrower’s specific cash flow buffer.
Comparison 2: Flexibility to Restructure
Flexibility runs in the opposite direction from certainty. Variable rate loans offer significantly more flexibility to adjust the loan during its life; fixed rate loans constrain what can be done without triggering costs.
What Variable Rate Loans Allow
Variable rate commercial loans typically allow extra repayments at any time without penalty, redraw of any extra payments made, restructuring of the loan term or amortisation at annual reviews, refinancing to a different lender without break cost penalties, and partial or full repayment without prohibitive exit costs. The flexibility comes from the absence of the lender’s hedge against rate movement, which is what fixed-rate break costs compensate for.
What Fixed Rate Loans Restrict
Fixed rate commercial loans typically restrict extra repayments (some lenders cap annual extra repayments, others prohibit them entirely during the fixed period), restrict redraw, limit term restructuring, and trigger break costs if the loan is repaid or refinanced before the fixed period ends. The restrictions vary by lender and by the specific product, but the general pattern is significantly tighter than variable rate equivalents.
Why Flexibility Matters for Cash Flow Planning
Businesses with growing or volatile cash flow benefit from the option to apply surplus cash to the loan when it is available. A business expecting a major client payment in 18 months may want to apply some of that to the loan when it arrives, rather than commit to fixed repayments for 5 years. Variable rate structures allow this; fixed rate structures usually do not (or only within capped limits).
Refinancing Flexibility
Refinancing during the loan’s life is another area where flexibility matters. Variable rate loans can usually be refinanced without break costs, allowing the borrower to move to a different lender for better terms or to release equity. Fixed rate loans face break costs that often make refinancing during the fixed period uneconomic, even when better terms are available elsewhere. For businesses managing changing cash flow needs alongside other commitments, including the costs and obligations covered by how lease arrangements affect commercial cash flow, retaining flexibility on the loan side often matters more than the small rate premium that variable rates typically carry.
Comparison 3: Break Costs on Fixed Loans
Break costs are the single largest practical issue with fixed rate commercial loans. They apply when the borrower repays, refinances, or restructures the loan during the fixed period in a way the lender’s hedge does not accommodate.
How Break Costs Work
When a lender offers a fixed rate, they typically hedge their position in wholesale funding markets. The break cost compensates the lender for unwinding that hedge if the loan ends earlier than expected. The amount depends on the difference between the agreed fixed rate and the current market rate for the remaining fixed period, multiplied by the outstanding balance and the remaining time. The maths can produce break costs of tens of thousands of dollars on substantial loans.
When Break Costs Are Highest
Break costs are highest when market rates have fallen significantly below the agreed fixed rate, and when there is substantial time remaining on the fixed period. A loan fixed at 7% for 5 years, with 4 years remaining when the borrower wants to break, in a market where rates have dropped to 5%, could attract break costs of 8% to 10% of the loan balance. On a $800,000 loan, that is $64,000 to $80,000.
When Break Costs Are Lower
Break costs are lower when rates have risen since the loan was fixed (the lender’s hedge has not lost value) or when little time remains on the fixed period. A loan fixed at 5% in a market that has moved to 7% might attract minimal or no break costs if broken, since the lender can re-deploy the funds at a higher rate. Borrowers fixing in low-rate environments who later want to break face higher break cost risk than borrowers fixing in high-rate environments.
Estimating Break Costs Before Fixing
Borrowers considering a fixed rate should ask the lender for an indicative break cost calculation under different scenarios: rates moving down 1% to 2%, the loan being broken after 1 year, after 3 years, and so on. The numbers vary widely, but having indicative figures upfront helps the borrower understand the structural commitment they are making.
Variable Rates Have No Break Costs
By contrast, variable rate loans typically have no break costs (or only modest administrative discharge fees) when repaid or refinanced. This is the central source of variable rate flexibility: the borrower retains the option to exit or restructure at any time without compensating the lender for an unwound hedge.
Comparison 4: Refinancing and Restructure Options
Refinancing is a central tool in commercial loan management. The two structures handle refinancing very differently.
Refinancing Variable Rate Loans
Variable rate loans can typically be refinanced at any time, subject to the new lender’s approval. Costs include the new lender’s establishment fee, valuation fees, legal fees, and mortgage discharge and registration fees, but no break cost on the existing loan. Total switching costs are usually 1% to 2% of the loan amount. For larger loans or longer remaining terms, refinancing for a better rate or structure usually pays for itself within 12 to 24 months.
Refinancing Fixed Rate Loans
Fixed rate loans can technically be refinanced during the fixed period, but break costs usually make this uneconomic. The break cost on a fixed loan can exceed the cumulative rate savings from refinancing, even when the new rate is meaningfully better. Most fixed rate borrowers wait until the fixed period ends before refinancing, which is when the loan reverts to variable and break costs no longer apply.
Negotiating at Fixed Period Maturity
The end of a fixed period is one of the most useful negotiation moments in commercial lending. The borrower can either re-fix at the current market rate, move to variable, or refinance to a different lender. Knowing the maturity date is approaching, lenders often offer competitive renewal terms to retain the borrower. Borrowers benefit from preparing 3 to 6 months in advance, including obtaining indicative offers from alternative lenders.
Split Loan Refinancing Considerations
For borrowers with split fixed and variable loans, refinancing decisions become more nuanced. The variable portion can usually be refinanced freely, while the fixed portion is constrained by break costs. Some borrowers refinance just the variable portion mid-fixed-period, leaving the fixed portion with the original lender. This requires careful coordination but can deliver useful flexibility without triggering full break costs.
Annual Review Adjustments
Both fixed and variable loans involve annual reviews, where the lender reassesses the deal and may adjust terms, fees, or covenants. Variable rate loans have more scope for rate adjustments at reviews, since the variable rate already moves with market conditions. Fixed rate loans typically maintain the agreed rate through review periods (subject to the original fixed term), although other terms can still be renegotiated.
When Fixed Rate Typically Suits a Commercial Borrower
Fixed rate loans suit specific situations where certainty has clear operational or financial value. Recognising these scenarios helps borrowers use fixed rates deliberately rather than by default.
Tight Cash Flow Margins
Businesses operating on tight net margins benefit most from cash flow certainty. A 1% rate movement that adds $400 to $500 per month to a loan repayment is more disruptive to a business with $2,000 monthly net profit than to one with $20,000 monthly net profit. Fixed rates protect the smaller-margin business from rate-driven cash flow volatility.
Long-Term Holding with No Refinance Plans
Borrowers planning to hold the loan to maturity without refinancing benefit from fixed rates because the break cost risk does not materialise. If the loan is held throughout the fixed period, the certainty is delivered without the downside ever being triggered.
Rising Rate Environments
When market rates are expected to rise, fixing locks in current pricing before the increase. The certainty benefit is reinforced because the borrower is also avoiding higher variable rates. Whether the timing is right depends on what is already priced into the fixed rate market; sometimes, the fixed rate already includes much of the expected increase.
Specific Business Planning Horizons
Borrowers with defined planning horizons (such as a 5-year business plan, a fixed-term lease commitment, or a planned exit at a specific date) often benefit from matching the fixed period to the horizon. The fixed rate provides certainty across the planning period; the maturity falls when the broader plan reaches its decision point.
Seasonal or Volatile Revenue Businesses
Businesses with seasonal or volatile revenue benefit from cash flow predictability on the cost side. With revenue varying significantly throughout the year, having a fixed loan repayment provides one less variable to manage. Variable rates would add rate movement to revenue volatility, compounding the cash flow planning challenge.
When Variable Rate Typically Suits a Commercial Borrower
Variable rate loans suit borrowers prioritising flexibility, those expecting rates to fall, and those without a clear long-term commitment to the loan.
Likely Refinancing Within a Short Period
Borrowers expecting to refinance, sell, or restructure within 1 to 2 years benefit from variable rates because break costs on a short-remaining fixed term would erode any rate savings. Bridging finance, transitional loans, and short-term holding facilities are typically structured variables for this reason.
Falling Rate Environments
When market rates are expected to fall, variable rates allow the borrower to benefit from each cut as it arrives. Fixing in a falling-rate environment locks in higher rates than necessary, with break costs preventing the borrower from re-pricing as rates drop. The benefit only materialises if rates actually fall; views on rate direction often differ from outcomes.
Strong Cash Flow Buffer
Businesses with substantial cash flow buffers can absorb rate increases without operational pressure. For these borrowers, the certainty of fixed rates delivers less value, while the flexibility of variable rates can be used productively. Variable rates suit borrowers whose buffer is the source of resilience, not the loan structure.
Plans to Apply Extra Repayments
Borrowers planning to make substantial extra repayments (such as from anticipated business growth, asset sales, or distributions) benefit from variable rates because they can be made without restriction. Fixed rate loans often cap or prohibit extra repayments during the fixed period, which directly conflicts with this strategy.
Larger Deals with Sophisticated Treasury
Larger commercial loans (typically $5 million and above) often default to variable rates because the borrower has the treasury sophistication to hedge rate exposure directly through interest rate swaps or other derivatives rather than relying on the lender’s fixed rate. Variable rates, combined with an external hedge, can enable more flexible cost management than a packaged fixed product.
Side-by-Side Summary
Drawing the comparison dimensions together produces a clear reference. Both structures have their place, and the right choice depends on the borrower’s specific situation.
Certainty
Fixed: Constant repayment for the fixed period (typically 1 to 5 years), no exposure to rate movement during that time. Variable: Repayment changes with the broader rate environment, no certainty across any meaningful period.
Flexibility
Fixed: Restrictions on extra repayments, redraw, restructuring, and refinancing during the fixed period. Variable: Broad flexibility on extra repayments, redraw, restructuring, and refinancing at any time.
Break Costs
Fixed: Significant break costs if repaid or refinanced during the fixed period, particularly if rates have fallen. Variable: Typically, no break costs; only modest discharge and registration fees apply.
Refinancing
Fixed: Refinancing during the fixed period is usually uneconomic because of break costs. Variable: Refinancing can be considered at any time, subject to the new lender’s approval and standard switching costs.
Rate Movement Exposure
Fixed: Protected from rate rises during the fixed period; misses out on rate falls. Variable: Benefits from rate falls; exposed to rate rises.
Practical Pointers for Choosing Between Them
A few practical habits help borrowers make the fixed vs variable decision deliberately.
Model Both Structures at Multiple Rates
Before agreeing to either, run the comparison: repayments under the fixed rate, repayments under the current variable rate, repayments at variable rate plus 1%, and repayments at variable rate plus 2%. Whichever structure still fits comfortably in the worst-case scenario provides more resilience.
Ask the Lender for Indicative Break Cost Scenarios
If considering a fixed rate, ask the lender for indicative break costs under different scenarios: rates falling by 1% or 2%; the loan broken after 1 year or 3 years. The numbers vary widely and depend on market conditions at the time of breaking, but indicative figures help the borrower understand the structural commitment.
Match the Fixed Period to the Plan
Choose a fixed period that aligns with the borrower’s planning horizon, not the lender’s longest available term. A 2-year fixed, matched to a defined business event, is more disciplined than a 5-year fixed chosen for a marginally better rate. Aligning the fixed period to a known decision point reduces break cost risk.
Consider Splitting
For larger loans, splitting between fixed and variable produces a hybrid that delivers some certainty and some flexibility. A 70/30 split (70% fixed, 30% variable) gives the borrower predictable repayments on most of the loan while preserving flexibility on the variable portion for extra repayments, redraw, or restructure.
Revisit at Fixed Period Maturity
The end of a fixed period is a natural moment for decision-making. Prepare 3 to 6 months in advance: get updated financials in order, obtain indicative offers from alternative lenders, and decide whether to re-fix, switch to variable, or refinance. Lenders typically engage more flexibly at this moment than between fixed periods.
Where to Read More About the Trade-Offs
The trade-offs between fixed and variable interest rates apply similarly across residential and commercial lending, even though the specific terms and break costs differ. Understanding the underlying mechanics in a consumer context provides useful context for commercial decisions.
ASIC’s MoneySmart guide on comparing fixed and variable interest rates at moneysmart.gov.au covers the practical trade-offs between the two structures, including budgeting predictability, the impact of rate changes, break fees on fixed loans, and the option to split between fixed and variable. While focused on home loans, the underlying mechanics apply to commercial loans of similar structure.
Frequently Asked Questions (FAQs)
1. How long can I fix a commercial loan for?
Commercial loans typically offer fixed periods of 1 to 5 years, with some lenders offering longer fixed terms (7 to 10 years) for property loans. The longer the fixed period, the higher the typical pricing and the larger the potential break cost if the loan is broken early. Most commercial borrowers fix for 2 to 3 years if they choose to fix at all, balancing certainty against the long-term commitment.
2. Will I save money with a fixed or variable rate?
Neither is universally cheaper across the loan’s life. Whether fixed or variable produces lower total cost depends on what rates do during the loan’s life. If rates rise after fixing, the fixed rate saves money. If rates fall, the variable rate would have saved money. The market’s expectation of rate direction is already priced into the fixed rate offered, so the borrower’s view needs to differ from the market’s view for a fixed rate to deliver savings.
3. How are break costs calculated on a fixed commercial loan?
Break costs compensate the lender for unwinding the hedge they put in place to fund the fixed rate. The calculation depends on the difference between the agreed fixed rate and the current market rate for the remaining fixed period, the outstanding loan balance, and the time remaining on the fixed term. Break costs are typically highest when rates have fallen significantly below the fixed rate and substantial time remains. They can run to tens of thousands of dollars on substantial loans.
4. Can I make extra repayments on a fixed rate commercial loan?
Some lenders allow capped extra repayments (such as $10,000 per year above the scheduled amount) during the fixed period. Others prohibit extra repayments entirely or only allow them in specific circumstances. Restrictions vary widely by lender and by the specific product. Borrowers planning to apply extra repayments during the loan’s life should confirm the lender’s policy before fixing.
5. What happens at the end of a fixed period?
At the end of the fixed period, the loan typically reverts to a variable rate based on the lender’s standard variable rate for commercial lending. The borrower has three main options: stay on the variable rate, re-fix for another fixed period at the rates available at that time, or refinance to a different lender. Preparing 3 to 6 months in advance and obtaining indicative offers from alternative lenders usually produces better outcomes than waiting until the deadline.
6. Can I split my commercial loan between fixed and variable?
Yes, most commercial lenders allow split structures. The borrower nominates the proportion in each (often 50/50, 60/40, or 70/30), with the lender setting up two facilities with the same security but different rate structures. Splits suit borrowers wanting some certainty without committing the full loan to fixed terms. The flexibility on the variable portion (extra repayments, redraw, refinancing) is preserved, while the certainty on the fixed portion is delivered.
7. Is variable always more flexible than fixed?
Generally yes, but the gap varies by lender and product. Variable rate commercial loans typically allow unrestricted extra repayments, free redraw, and refinancing without break costs. Fixed rate loans usually restrict each of these to varying degrees. Some lenders offer fixed products with limited flexibility (such as capped extra repayments), but the flexibility is rarely as broad as variable rate equivalents.
The Bottom Line
Fixed and variable commercial loans serve different cash flow priorities. Fixed rates deliver certainty in repayments for the agreed period, protecting cash flow from rate movement, at the cost of flexibility and break cost risk if circumstances change. Variable rates deliver flexibility, the chance to benefit from rate falls, and broad refinancing options, at the cost of cash flow uncertainty as rates move over time. Neither is universally better; each suits different borrower situations and goals.
For most commercial borrowers, the smartest approach is to map the choice against the specific cash flow profile of the business: tight margins favour certainty; flexible cash flow can absorb variability. Planning horizons matter too: a defined business event in 3 years suits a 3-year fixed; an open-ended timeline suits variable or a split structure. A specialist commercial broker can help model both structures against the actual deal and identify which lenders offer the most competitive terms for the chosen structure. Making the fixed vs variable decision deliberately, with the full cash flow picture visible, usually produces better outcomes than defaulting in either direction.
