Debt Recycling Calculator Australia

What the debt recycling calculator does

The debt recycling calculator compares two ways of using the same annual cash budget on an Australian home loan. In the first, every dollar goes into the mortgage until it is gone. In the second, part of that mortgage is converted into a separate interest-only split used to buy income-producing investments, and the distributions plus the tax refund on the now-deductible interest are redirected back at the remaining home debt.

The result is a side-by-side view: the tax refund in year one, the years each path takes to clear the non-deductible loan, the portfolio value at the end of the horizon, and the difference in net position between the two. Both projections start from the same balance, the same interest costs and the same cash commitment, so the comparison isolates what the strategy actually changes.

How debt recycling works in Australia

Interest is deductible when the borrowed money is used to produce assessable income. The loan on the house you live in fails that test, so its interest is a pure cost. A loan used to buy shares or a managed fund that pays distributions generally passes it.

Debt recycling exploits that distinction without increasing total borrowings. You make an extra repayment on the home loan, then redraw the same amount into a clean, separate split and invest it. Your debt is the same size the day after as it was the day before, but a slice of it has changed character from non-deductible to deductible.

The mechanics matter more than the idea. The split has to be a distinct loan account with no personal spending mixed into it, because the deduction follows the use of the funds and a contaminated account is difficult to apportion. Most people set the split up as interest-only so the deductible balance is not accidentally repaid, and direct all spare cash at the home loan instead.

The formula behind the result

Each year the calculator works through the same short sequence for both paths. Deductible interest is the investment split multiplied by the split rate. Taxable investment income is distributions plus franking credits minus deductible interest. Tax cash flow is franking credits minus taxable investment income multiplied by the marginal rate. Cash to the home loan is the budget plus distributions plus tax cash flow minus all interest.

Whatever is left after every interest bill reduces the non-deductible balance. Once that balance reaches zero the surplus goes into the portfolio instead. Your marginal rate is read from the ATO resident bracket table for the taxable income you enter, with the Medicare levy added on top wherever the marginal income tax rate is above zero.

Reading your result

Four figures carry most of the meaning:

• Net benefit: the gap in net position between the two strategies at the end of the horizon. This is the headline number, and it is the one most sensitive to your return assumption.
• Tax refund in year one: the cash the deduction returns while the portfolio is still small and the split interest exceeds the distributions.
• Years to clear the home loan: often shorter under recycling, because distributions and the refund are extra cash the standard path never receives.
• Portfolio value: the asset the strategy builds. It is what justifies carrying deductible debt for years.

A zero in either of the payoff fields means the loan was not fully repaid inside the projection horizon, not that it was repaid immediately.

What drives the outcome

Three assumptions dominate. The first is the gap between your investment return and the split interest rate: if the portfolio earns less than the loan costs, gearing works against you and no tax deduction rescues it. The second is your marginal rate, since the refund is simply the deduction multiplied by that rate. The third is time, because the portfolio compounds while the home loan runs down on a straight line.

It is worth changing one input at a time. Drop the return by two percentage points and watch how much of the benefit disappears. That sensitivity is the honest measure of how much risk the strategy is carrying.

Limitations to keep in mind

• The projection uses one steady return every year. Real returns arrive unevenly, and a poor first decade is very different from a poor last one even when the average is identical.
• Capital gains tax on eventually selling the portfolio is not modelled, and neither are brokerage, fund fees or loan establishment costs.
• A single marginal rate is applied throughout. A large deduction can push part of your income into a lower bracket, and your income may change over the years being projected.
• The calculator assumes the split stays interest-only at a constant rate and that the deduction is available for the whole period. Refinancing, redrawing for private purposes or a change in how the funds are used can all break that.
• The ATO looks at the use of the borrowed money, not the label on the account. Poor record keeping is the most common reason a claimed deduction fails.

When it makes sense to look at this

Debt recycling suits a household with a stable income, a comfortable buffer, a long horizon and a genuine tolerance for seeing an investment balance fall. It suits a high marginal rate better than a low one. It suits someone who would have invested anyway and is choosing how to fund it, rather than someone stretching to invest at all.

If any of those are missing, the plain path of repaying the home loan is a perfectly respectable answer, and it carries none of the market risk.

The rates and thresholds this tool uses are kept up to date, so your result reflects current settings. Treat the output as a planning estimate for comparing scenarios, and confirm the structure with the ATO or a licensed adviser before setting up a loan split.

This article is general information only and not financial advice.

About This Debt Recycling Calculator

Use this debt recycling calculator to get an instant, accurate estimate. The figures follow official ATO guidance and every rate and threshold is kept up to date for 2026. Adjust the inputs above to match your situation, or browse all our calculators to plan your next step.