ETFs vs. offset accounts: When to move money?

You’ve touched on a key consideration in personal finance: optimizing the allocation of your funds based on the return and risk associated with different investment vehicles. The decision to shift money between ETFs and an offset account can indeed be influenced by the prevailing interest rates, among other factors.

Comparing ETF Returns and Loan Savings

The basic math you’ve outlined is a good starting point. If ETFs are expected to return approximately 7% annually and your mortgage interest rate is around 6%, the decision might seem straightforward. However, there are a few additional layers to consider:

1. Risk and Return: ETFs, while potentially offering higher returns, come with market risk and volatility. The returns are not guaranteed and can vary widely year over year. In contrast, money saved on mortgage interest by using an offset account is effectively a risk-free return. You are guaranteed to save on interest costs equivalent to the mortgage rate.

2. Liquidity: ETF investments are generally more liquid compared to the money in an offset account, which is tied to a mortgage. This means if you need cash quickly, it might be easier to sell off some ETFs.

3. Interest Rate Fluctuations: If interest rates rise, the savings from an offset account become more valuable. Conversely, if rates are low, the potential higher returns from ETFs might be more attractive.

4. Financial Goals and Time Horizon: Your personal financial goals and the time horizon for those goals also play a crucial role. If you are aiming for long-term growth and can tolerate volatility, ETFs might be more appealing. If reducing debt and saving on interest is a priority, especially in the short to medium term, focusing on the offset account might be better.

Practical Strategy

Given these considerations, the decision isn’t always as simple as comparing the numerical ret

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Hi Isabella, great question.

I wrote about this in the following article, since there are a few ways to look at the options including something most people forget: https://strongmoneyaustralia.com/mortgage-vs-...

Typically yes, when rates are low, paying down debt is less attractive. But low rates also push markets and asset prices up, so if you wait for rates to be low, then prices will already be higher to account for low rates, meaning returns from there may be lower.

I definitely don’t think selling makes a lot of sense, remember you are possibly going to lose a big chunk of money to capital gains tax. So rotating your money from ETFs and offset accounts is not only going to result in a bunch of taxes, but it’s also going to be playing a timing game to some extent, which often isn’t that sensible.

The article explains more including how to tailor it to your situation – all the best.