Offset accounts explained: how they work and when they beat redraw

The offset account is the most underused feature in Australian home lending — plenty of borrowers pay for one in their loan package and then leave their savings in a separate account earning taxable interest. Used properly, an offset can shave years off a mortgage without a single extra “repayment”.

How an offset works

An offset account is an everyday transaction account linked to your home loan. When the lender calculates your daily interest, they charge it on loan balance minus offset balance.

Owe $500,000 with $40,000 sitting in the offset? You’re charged interest on $460,000 — every day that money sits there. Your repayment stays the same, so more of each repayment goes to principal, and the loan shortens.

Two things make this quietly powerful:

1. It works daily. Salary landing in the offset saves interest from the day it arrives — even money that leaves again for bills saved interest while it sat there.
2. The “return” is tax-free. Savings interest is taxable income; interest you don’t pay isn’t. For most taxpayers, money in an offset effectively “earns” more than the same money in a savings account — at zero risk.

Offset vs redraw

They sound identical — both let your spare cash reduce loan interest — but the differences matter:

• Access. An offset is your money in a transaction account, accessible like any bank account. Redraw is a facility for taking back extra repayments you’ve made on the loan — access can be slower, minimums can apply, and lenders can change redraw terms.
• Future flexibility (the big one for investors). If your home might become a rental later, the difference is significant for tax. Money pulled from an offset doesn’t change the loan or its interest deductibility. Money pulled via redraw is treated as new borrowing, and its deductibility depends on what you use it for. Getting this wrong permanently muddies the tax position — it’s one of the most common structuring mistakes we see.
• Cost. Full offsets usually come with package fees or slightly higher rates; redraw is typically free. If you hold little cash, redraw may be all you need.

Who benefits most from an offset

• Savers with a real balance. The feature only earns its fees if meaningful money sits in it.
• Anyone with irregular income — buffers waiting in offset are working while they wait.
• Future investors — anyone who might convert their home to a rental should default to offset over redraw, and take advice.
• Households running expenses through a credit card and clearing it monthly, keeping salary in the offset all month. (Only works with discipline.)

Who can skip it

If you live pay-to-pay with minimal buffer, a basic loan with a lower rate and no package fee likely beats a feature you can’t feed.

The practical setup

Salary into offset. Bills out of offset. Savings goals in offset (not a separate bank’s savings account). Loan repayment untouched. That’s the whole strategy — the loan does the compounding for you.

This article is general information only and doesn’t consider your personal circumstances. Tax outcomes depend on your situation — seek advice from a registered tax agent.