Top tips to use variable rate loans and extra repayments

A variable rate investment loan gives you direct control over how much you repay and when you access that money again.

For endodontists balancing practice expenses, equipment upgrades, and irregular income from referral patterns, that flexibility matters more than shaving another 0.2% off a fixed rate. The ability to park surplus income during busy periods and redraw it when referrals slow or a new microscope needs financing can mean the difference between holding an investment property through a vacancy or selling it at the wrong time.

Variable Rate Loans With Offset and Redraw: Which One Fits Your Cash Flow

Variable rate investment loans typically offer either an offset account or a redraw facility. An offset account sits alongside your loan and reduces the interest charged on the full loan balance. A redraw facility lets you make extra repayments directly into the loan and withdraw them later, subject to lender terms.

Consider an endodontist who generates $40,000 per month during peak referral periods but drops to $25,000 in quieter months. With a $600,000 investment loan on a variable rate and an offset account, surplus income from busy months sits in the offset, reducing interest without locking the funds away. When a $35,000 CBCT scanner needs replacing or a vacancy period hits, that money comes out without a redraw application or a break fee.

Offset accounts preserve full deductibility of interest on the investment loan because you're not technically reducing the loan balance. Redraw facilities work differently—once you make an extra repayment, the loan balance drops, and pulling money back out can blur the line between investment and personal borrowing if you're not careful with record-keeping.

How Extra Repayments Affect Interest Deductions on Investment Loans

Interest on an investment loan is deductible when the borrowed funds are used to generate assessable income. Extra repayments reduce the outstanding balance, which lowers your deductible interest. If you later redraw those funds for a non-investment purpose—replacing a car, funding a holiday, or covering personal expenses—the interest on the redrawn amount is no longer deductible.

In our experience, endodontists often redraw from investment loans to cover short-term practice costs, then forget to separate that portion when lodging their tax return. The ATO's view is that the purpose of the borrowing at the time you withdraw the funds determines deductibility, not the original loan purpose. That means if you redraw $20,000 for a personal expense, the interest on that $20,000 is not claimable, even though the original loan was for an investment property.

If you're planning to use redraw regularly, keep a separate transaction record and consider a loan structure that splits investment and personal borrowing from the start. Some lenders allow multiple splits under one facility, so you can quarantine investment debt from personal debt without opening entirely separate loans.

When To Lock In Part Of Your Variable Rate Investment Loan

Some endodontists hold a fully variable investment loan during periods of stable or falling rates, then split part of the balance to a fixed rate when rates start climbing. This approach preserves flexibility on the variable portion while capping repayments on the fixed portion.

A common structure is 50% variable, 50% fixed, with the variable portion holding all the extra repayment and offset features. That way, if you have a $700,000 investment loan, $350,000 is fixed at a known rate for two or three years, and the other $350,000 remains variable with full offset access. You're not locked into one strategy, and you're not gambling on timing the rate cycle perfectly.

Refinancing an existing variable loan into a split structure usually takes two to three weeks and doesn't require a new valuation if your loan-to-value ratio is under 80%. If you're already holding investment loans for dentists and want to review whether a split makes sense for your current portfolio, the timing depends on where your cash flow sits and whether you're planning another purchase in the next 12 months.

Using Variable Investment Loans To Build A Multi-Property Portfolio

Variable rate loans make it easier to release equity for your next deposit without refinancing the entire loan. If your investment property increases in value and your loan-to-value ratio drops below 80%, you can often access that equity through a top-up or separate split, keeping your original loan terms intact.

Consider an endodontist who bought an investment property three years ago for $650,000 with a $520,000 loan. The property is now valued at $780,000, and the loan balance is $500,000. That puts the loan-to-value ratio at 64%, leaving approximately $124,000 in accessible equity before hitting the 80% threshold. With a variable loan structure, a split can be created to release that equity as a deposit for a second property, while the original loan continues with its existing rate and offset.

This approach avoids the need to refinance the entire loan, which would reset any rate discounts, discharge fees, and application timelines. If you're planning to expand your property portfolio, a variable loan with equity release flexibility gives you faster access to deposits without waiting for fixed terms to expire.

Structuring Variable Loans Around Referral Income and Vacancy Periods

Endodontists often see income fluctuate based on referral relationships, locum availability, and patient demand. A variable rate investment loan with offset gives you a buffer that adjusts to your cash flow without forcing you to choose between extra repayments and liquidity.

In a typical scenario, an endodontist channels $10,000 per month into an offset account linked to a $550,000 investment loan during high-referral months. Over six months, that builds a $60,000 buffer. When the property sits vacant for eight weeks or a major equipment expense arises, the offset balance is drawn down to cover holding costs and practice expenses. The loan balance never changes, so all interest remains deductible, and there's no need to apply for redraw approval or explain the withdrawal to a lender.

This structure works particularly well when combined with interest-only repayments, which keep the minimum monthly obligation low and let you direct cash flow where it's needed. If you're weighing whether interest-only makes sense for your situation, the decision typically hinges on whether you're prioritising portfolio growth or debt reduction. For endodontists in growth mode, interest-only loans for dentists paired with a variable rate and offset can deliver both flexibility and tax efficiency.

Refinancing From Fixed To Variable When Your Circumstances Change

Many endodontists locked into fixed rates during the low-rate environment and are now coming off those terms with repayments jumping $1,500 to $2,500 per month. Moving to a variable rate after a fixed term expires gives you access to offset and redraw features that weren't available during the fixed period.

If you're approaching a fixed rate expiry, the transition to variable is automatic unless you choose another fixed term or refinance to a different lender. Refinancing at this point can also be an opportunity to negotiate a better rate discount, consolidate other debts, or restructure your loan to release equity. Timing the refinance to coincide with your fixed term expiry avoids break costs, and if your income or property values have improved since the original loan, you may qualify for a lower rate or higher borrowing capacity.

Some lenders offer retention discounts when you move from fixed to variable within the same institution, but those discounts are rarely as sharp as what's available through investment loan refinancing for dentists with a different lender. The difference can be 0.3% to 0.5%, which on a $600,000 loan translates to $1,800 to $3,000 per year in interest savings.

Call one of our team or book an appointment at a time that works for you. We'll review your current loan structure, compare refinancing options across lenders who understand endodontic income patterns, and help you set up a variable rate facility that fits how your cash flow actually moves throughout the year.

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