Variable Rate Loans and Offset Accounts: How They Work

A variable rate home loan paired with an offset account lets your savings reduce the interest you pay, while keeping that money available when you need it. The trade-off is that your rate can move and the feature may carry a fee.

This article is for lawyers weighing up a variable rate against other structures, and deciding whether an offset account suits their cash flow. Many home loans for lawyers are structured around this pairing, so it helps to understand the mechanics before you apply.

How Does a Variable Rate Home Loan Work?

A variable rate home loan has an interest rate that your lender can raise or lower over the life of the loan. Your repayments change when the rate does.

Lenders set variable rates with reference to their own funding costs and commercial decisions, and the RBA cash rate is one influence among several. A lender may not pass on a cash rate change in full or on the same day. Interest is generally calculated on the daily balance and charged monthly, although the exact method depends on the lender, so check the loan contract.

The main benefit is flexibility. Variable loans commonly allow extra repayments and redraw, and they generally do not carry break costs. Discharge or other fees may still apply when you refinance, so check your loan contract. The main risk is repayment uncertainty. If your rate rises, your minimum repayment rises with it, so you should be comfortable with that possibility before you commit. A fixed rate gives certainty for a set period, but often limits extra repayments and can attract break costs if you exit early.

What Is an Offset Account and How Does It Reduce Interest?

An offset account is a transaction account linked to your home loan. Its balance is netted against your loan balance each day, and interest is charged only on the difference.

The account holds your money, so you can still spend from it. A 100% offset means every dollar in the account reduces the interest-bearing balance by a dollar. Some lenders offer partial offsets, so confirm the percentage.

As an illustration, assume a loan of $800,000 at 6.75% p.a. (an example rate only, not a current market rate) and $50,000 sitting in a linked offset. Interest is charged on $750,000 instead of $800,000. At 6.75%, that is $750,000 x 0.0675, or $50,625 a year, compared with $54,000 on the full balance. The difference is $3,375 a year, which is the same as earning 6.75% on that $50,000. Unlike interest earned in a savings account, the amount you avoid paying is not generally treated as income, but tax treatment depends on your circumstances, so speak with your accountant.

The trade-off is that package loans with an offset can carry an annual fee or a slightly higher rate than a basic loan without one. The offset only pays off if you hold enough in it, consistently, to outweigh that cost.

Offset Account or Redraw: Which Suits a Lawyer's Cash Flow?

An offset account keeps your money separate from the loan and fully accessible, while redraw lets you withdraw extra repayments you have already made. Both reduce interest, but they behave differently.

With redraw, the funds are paid into the loan, and access depends on the lender's conditions. Some lenders limit the amount or the number of withdrawals, and processing may not be immediate. For lawyers with irregular income, such as partners awaiting distributions, barristers with lumpy fee receipts, or practitioners with tax or practising certificate costs due at set times, an offset's same-day access is useful. A barrister who receives fees in uneven blocks can park them in offset until tax and chambers costs fall due.

A separate consideration applies if you may later keep the property as an investment. Money held in an offset is not a new borrowing. Withdrawing it for private use does not change the deductibility of the linked loan, and only the interest actually charged (after the offset) is deductible. Redrawing extra repayments for private purposes can create a non-deductible portion of the loan. Because of this, an offset is generally the safer structure if the home may become an investment property. Get advice from your accountant, and see our page on debt recycling for how structure affects the later use of the loan.

Worked Example: Offset Balance Against Repayments

Consider a litigation lawyer who borrows $800,000 over 30 years at an illustrative 6.75% p.a. on a principal and interest variable loan. The monthly repayment is roughly $5,189. This is an illustration only, and a loan calculator will confirm figures for your situation.

She keeps her settlement funds and a tax buffer, around $60,000 on average, in a linked offset. Her minimum repayment does not change, because the offset reduces interest rather than the required repayment. Instead, more of each repayment goes towards principal, because less of it is consumed by interest. At the same example rate, the interest avoided on $60,000 is about $4,050 a year.

The outcome is that she pays the loan down faster without locking money away. When a large tax bill arrives, she withdraws from the offset and the interest saving shrinks accordingly. The benefit is real only while the balance stays in the account, so it suits people who hold a genuine buffer rather than those who spend their balance down to near zero each month.

Variable, Fixed or Split Rate: Choosing a Structure

A split rate divides your loan into a fixed portion and a variable portion, so you get some repayment certainty and some flexibility. It is a compromise, not a cure for rate risk.

Offset accounts are commonly available only on the variable portion, and some lenders do not offer an offset with fixed loans at all. If you want the interest saving, the size of your variable portion matters. Fixed portions can also limit extra repayments and carry break costs if you exit early.

If your income is stable and you want predictable repayments, a larger fixed share may suit. If your cash balances are large or irregular, a larger variable share with an offset keeps more of your money working. Lenders assess your borrowing capacity at the loan's rate plus a buffer, which APRA expects to be at least 3 percentage points for ADIs. The buffer applies to both fixed and variable loans. The product rate you choose therefore still affects how much you can borrow, and lender policies differ.

What to Compare Before You Choose a Lender

When you compare home loan products, look at the full cost of the package, not just the headline rate. The offset percentage, annual package fee, discounts and conditions all affect the result.

A lower rate on a loan with no offset can cost more than a slightly higher rate with a full offset, if you hold a sizeable balance. Run the numbers using your realistic average balance rather than your strongest month. If you already have a loan, a loan health check can show whether your current rate and features still fit, and our page on getting a lower interest rate explains how rate discounts can be negotiated, depending on your deposit size and lender.

Whether you are buying, or refinancing, a mortgage broker for lawyers can compare lenders and explain which structure suits your practice type and income pattern. Call one of our team or book an appointment at a time that works for you, and we will model the offset against your own figures.

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