It is worth it when your expected after-tax return clears one number: the after-tax cost of the loan. Get that hurdle right and everything else is detail.
Debt recycling is generally worth it when the after-tax return you reasonably expect from the investment is higher than the after-tax cost of the loan that bought it, held over a long enough period for that edge to compound. Because the investment interest is generally deductible, the real cost of the loan is lower than its headline rate, which lowers the bar the investment has to clear. That gap between your expected return and the after-tax loan cost is the hurdle. When the gap is comfortably positive and you can hold for the long term, the strategy tends to pay off. When rates are high, your horizon is short, or expected returns are thin, the gap narrows or disappears and it may not be worth it. This is general information only, not financial advice.
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Strip debt recycling back to its economics and it is a simple comparison. You are borrowing money at one cost and putting it into an investment you hope returns more. The strategy adds value only when the investment out-earns the borrowing, after tax, over time.
The hurdle rate is the after-tax cost of the investment loan. Your expected after-tax return has to clear it, and ideally clear it with room to spare. If your expected return sits well above the hurdle, the odds are in your favour. If it sits at or below the hurdle, you are taking on leverage and market risk for little or no expected reward, and paying down the home loan directly may serve you better.
Two features make the hurdle lower than people assume. First, the interest on the investment split is generally tax-deductible, so a slice of the cost comes back at your marginal tax rate. Second, part of your expected return arrives as franked dividends, which carry their own tax offsets. Neither is a guarantee of anything, but both lower the bar the investment has to clear. The question is never simply "will the market beat my mortgage rate", it is "will my after-tax return beat my after-tax loan cost".
The after-tax cost of the loan is the headline interest rate reduced by the value of the deduction. As a rough guide, it is the loan rate multiplied by one minus your marginal tax rate. The higher your marginal rate, the more the deduction is worth, and the lower your real cost of borrowing.
The table below is illustrative only. It assumes a hypothetical 6.00% investment loan rate and shows how the after-tax cost falls as the marginal tax rate rises. The rates shown include the Medicare levy and are used purely to demonstrate the maths, not to quote any actual product or forecast any rate.
| Marginal tax rate (incl. Medicare) | Illustrative loan rate | Approx. after-tax cost (the hurdle) |
|---|---|---|
| 21% | 6.00% | 4.74% |
| 34.5% | 6.00% | 3.93% |
| 39% | 6.00% | 3.66% |
| 47% | 6.00% | 3.18% |
Read down that last column and you can see why debt recycling suits higher earners: at a 47% marginal rate the same 6.00% loan effectively costs about 3.18% after tax, so the investment only has to out-earn roughly 3.18% after tax for the strategy to be adding value. At a 21% rate the hurdle is closer to 4.74%, a meaningfully harder bar to clear. Your own numbers depend on your actual rate and circumstances, and a registered tax agent should confirm the tax side.
The figures below are hypothetical and rounded, chosen only to show how the hurdle works. They are not a quote, a forecast or a promise of any result, and your outcome would differ.
Assume a hypothetical investor on a 47% marginal rate draws $100,000 from an investment split at an illustrative 6.00% rate. The headline interest is $6,000 a year, but at a 47% marginal rate the deduction is worth roughly $2,820, so the after-tax cost is about $3,180, an effective 3.18%. That $3,180 is the hurdle: the amount the $100,000 investment needs to earn after tax, each year on average, just to break even against the borrowing.
Now suppose the diversified portfolio produces an illustrative total return of, say, 4% from franked dividends plus some long-run growth. If that after-tax return sits above 3.18%, the arrangement is expected to add value, and the surplus, along with the dividends and the tax refund, is redirected to clear the non-deductible home loan faster. If instead the portfolio returns less than the hurdle over the period, the strategy costs more than it makes. Same structure, opposite result, decided entirely by whether the return cleared the hurdle.
The whole decision in one line: expected after-tax return, minus the after-tax loan cost, held for long enough to compound. A positive gap with a long horizon is the case for doing it. A thin or negative gap is the case for waiting.
Certain conditions widen the gap between your expected return and the hurdle, which is what makes the strategy more likely to be worth it. None of them guarantees an outcome, but together they load the odds in the right direction.
Rate conditions deserve their own note, because they move the hurdle directly. We cover how a higher-rate environment changes the sums in debt recycling when interest rates are high, and we set realistic expectations for the return side in realistic returns from debt recycling.
The hurdle answers whether the maths works on paper. It does not, on its own, tell you whether the strategy fits your life. A positive expected gap is necessary, but it is not sufficient. If your income is unstable, your buffer is thin, or you would lose sleep watching a leveraged portfolio fall, the numbers can look fine while the strategy is still wrong for you.
Worth it and suitable are two different tests, and both have to pass. This page is deliberately about the first: the break-even maths. The second test, the personal red flags that mean you should wait or walk away, is a separate question covered in full in when not to debt recycle. If any of those signs apply to you, a favourable hurdle does not override them.
Get a free, no-obligation estimate, or talk your situation through with a licensed broker who structures debt recycling loans every week.
Book a free call →There is one point the simple hurdle maths can hide. Two portfolios can average the same return over a decade and leave you in very different positions, depending on when the good and bad years fall. This is sequencing risk, and it matters more when you are borrowing.
If a sharp fall lands early, while the loan is at its largest, you are carrying full interest cost against a portfolio that is temporarily worth less. That is uncomfortable, and it is where people are tempted to sell at the bottom and lock in the loss, which turns a paper dip into a permanent one. If the same fall lands later, once dividends and refunds have already chipped away at the debt, its sting is smaller.
You cannot control the order of returns, but you can control your ability to sit through a bad early stretch: a cash buffer, comfortable interest cover, and a genuine long-term horizon. Those are what let the average, rather than the sequence, decide your result. It is also why we say debt recycling is a long game, not a quick win. To see the effect year by year, including a deliberately bad market year, read our fully worked $600k mortgage example.
A note on past performance. The returns used on this page are illustrative and hypothetical. Past performance is not a reliable indicator of future performance, markets can and do fall, and debt recycling uses leverage that can amplify losses. Nothing here is a forecast or a promise of any result.
Your expected after-tax return needs to clear the after-tax cost of the loan, which is roughly the loan rate reduced by your marginal tax rate. At a high marginal rate that hurdle can be meaningfully below the headline loan rate. The figures depend on your own rate and circumstances, and are best confirmed with a licensed broker and a registered tax agent.
Higher rates raise the hurdle the investment has to clear, so the gap narrows, but the interest is still generally deductible, which softens the real cost. Whether it remains worth it depends on your expected return, your marginal rate and your horizon. We go into the rate environment specifically in our high-interest-rates guide.
Because the deduction is worth more at a higher marginal tax rate, which lowers the after-tax cost of the loan and therefore the hurdle. The same investment has an easier bar to clear. Our page for high-income earners works through that in more detail.
Generally no. A short horizon leaves too little time for a positive gap to compound and exposes you to the order of returns, so a bad early year can define the result. Debt recycling is usually a long-term strategy. If a short horizon applies, our "when not to debt recycle" guide explains why waiting can be the better call.
The deduction lowers the hurdle and, when redirected to the home loan, speeds up clearing non-deductible debt, so it helps. But the strategy still relies on the investment out-earning its after-tax cost over time. The refund improves the maths; it does not, on its own, make a poor investment worthwhile.
The personal red flags that override a favourable hurdle.
Read more → EXAMPLEThe maths modelled year by year, bad year included.
Read more → GUIDEWhat to actually expect on the return side, without the hype.
Read more →