How Does an Offset Account Reduce Home-Loan Interest?

An offset account is a transaction account linked to your home loan. The balance in this account is offset against your loan balance before interest is calculated, meaning you only pay interest on the difference.

How an offset account changes the interest calculation

Interest on a home loan is typically calculated daily and charged monthly. When you have an offset account, the lender subtracts your account balance from your loan balance every day before calculating that day's interest. Because your principal loan balance isn't actually reduced, your minimum monthly repayment stays the same, but a larger portion of that repayment goes toward paying down the principal rather than paying interest.

Illustrative example

Illustrative example: You have a home loan of $500,000 and $50,000 sitting in a linked offset account. The lender will calculate your daily interest as if your loan balance is only $450,000. Over time, this reduces the total interest charged and can help you pay off the loan faster.

What may change the outcome

The benefit of an offset account depends on your interest rate, how much money you keep in the account, and whether the account is 100% offset or partial. Additionally, loans with offset accounts sometimes carry higher annual fees or slightly higher interest rates than basic loans.

Common misunderstandings

Many people believe the money in an offset account earns interest. It does not. Instead, it saves you from paying interest on your home loan. Since home loan interest rates are typically higher than savings account rates, and saving interest doesn't trigger income tax (unlike earning interest), an offset is often more tax-effective.

When a personal review may help

If you don't typically hold much cash in your transaction or savings accounts, the fees for an offset account might outweigh the interest savings. A broker can help you compare basic loans against offset packages to see which structure suits your cash flow.

Next step

Use our Home Loan Repayment Calculator to see how much interest you could save by keeping a balance in an offset account.

This article provides general information only and does not take into account your objectives, financial situation or needs. It does not constitute personal credit, financial, tax or legal advice. Lending outcomes depend on individual circumstances, lender policy and assessment.

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