
You've got a mortgage, but you're also earning a good income and have some surplus cash flow each month. This puts you in a fortunate but tricky position. What's the smartest way to use that extra money to build wealth and secure your financial future?

For most Australians, the decision boils down to three popular strategies:

1.  **The Simple Path:** Making extra repayments on your home loan.
2.  **The Long-Term Play:** Boosting your retirement nest egg with extra super contributions.
3.  **The Advanced Lever:** Using a debt recycling strategy to invest.

Each path has distinct benefits, risks, and tax implications. There's no single "best" answer, but there is a "best fit" for your personal goals, risk tolerance, and financial situation.

This article compares these three strategies head-to-head to help you understand which one might be right for you.

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## Strategy 1: The Simple Path — Making Extra Repayments

This is the most straightforward strategy. Any money you pay into your mortgage above your minimum required repayment goes directly toward reducing the principal.

**How it works:** You simply direct any spare cash into your home loan or a linked offset account. The effect is immediate — you'll pay less interest and shorten the life of your loan.

### Pros:
*   **Guaranteed, risk-free return:** The return on your money is equal to the interest rate on your home loan. If your rate is 6%, you're getting a guaranteed, tax-free 6% return on every extra dollar you contribute.
*   **Simplicity:** It's easy to set up and requires no complex financial products or structures.
*   **Psychological win:** Watching your mortgage balance fall faster provides a great sense of security and progress.

### Cons:
*   **Lower potential returns:** Your return is capped at your home loan interest rate, which is typically lower than the long-term average returns of growth assets like shares.
*   **Doesn't build other assets:** Your net worth increases, but all your wealth is tied up in a single, non-liquid asset (your home).
*   **Liquidity:** While you can often redraw extra repayments, the primary goal is to "trap" the money as home equity.

**Who is it best for?** Those who are risk-averse, prefer simplicity, are nearing retirement, or have high-interest personal debt they should be clearing first.

---

## Strategy 2: The Long-Term Play — Extra Super Contributions

This strategy involves funnelling your extra cash into your superannuation fund, either through salary sacrificing (pre-tax) or personal contributions (post-tax).

**How it works:** You arrange with your employer to sacrifice some of your pre-tax salary into super, or you make a personal contribution and potentially claim it as a tax deduction. This money is then invested by your super fund.

### Pros:
*   **Significant tax benefits:** Concessional (pre-tax) contributions are generally taxed at just 15% going into your fund, which is much lower than most people's marginal tax rate. [1] High-income earners may pay an additional 15% (Division 293 tax), but it's still a favourable rate. [2]
*   **Low-tax environment:** Investment earnings inside super are taxed at a maximum of 15%, allowing your wealth to compound more effectively.
*   **Forced discipline:** The money is locked away until you reach preservation age, preventing you from dipping into it for other purposes.

### Cons:
*   **Funds are inaccessible:** You cannot access the money until you meet a condition of release, typically retirement. This makes it unsuitable for medium-term goals.
*   **Contribution caps:** The government limits how much you can contribute each year under the concessional and non-concessional caps. [1]
*   **Less control:** While you can choose your fund's investment option (e.g., High Growth, Balanced), you don't have direct control over the specific assets purchased.

**Who is it best for?** High-income earners looking to reduce their taxable income, and anyone focused purely on maximising their retirement savings for the very long term.

---

## Strategy 3: The Advanced Lever — Debt Recycling

Debt recycling is a more active strategy that aims to achieve two goals at once: pay off your "bad" non-deductible home loan debt faster while building an investment portfolio.

**How it works:** In short, you pay down a portion of your home loan and then redraw those funds through a separate, dedicated loan split. You use this new loan to invest in income-producing assets like shares or ETFs. The interest on the investment loan is now tax-deductible.

All investment income (dividends, distributions) and tax benefits (from negative gearing and franking credits) are then used to make extra repayments on your original home loan, accelerating the process.

### Pros:
*   **Builds an external asset base:** You're not just paying off a loan; you're actively building a portfolio of investments that can grow in value.
*   **Tax-deductible debt:** You systematically convert your "bad" home loan debt into "good" investment debt, where the interest can be claimed as a tax deduction.
*   **Potential for higher returns:** You are exposed to the growth potential of the share market, which has historically outperformed mortgage interest rates over the long term.

### Cons:
*   **Higher risk:** This is a leveraged investment strategy. If the market falls, your portfolio could be worth less than your investment loan.
*   **Complexity:** It requires careful setup (separate loan splits) and diligent administration to avoid contaminating the loan purpose and losing tax deductibility.
*   **Requires discipline:** The strategy's success depends on you consistently reinvesting all proceeds back into the home loan.

**Who is it best for?** Financially disciplined individuals with a long investment horizon (10+ years), a stable income, and a comfortable tolerance for market volatility.

---

## Head-to-Head Comparison

| Feature                  | Extra Repayments             | Extra Super Contributions      | Debt Recycling                |
| ------------------------ | ---------------------------- | ------------------------------ | ------------------------------ |
| **Risk Level**           | Very Low                     | Medium (Market Risk)           | High (Leverage & Market Risk)  |
| **Potential Return**     | Low (capped at loan rate)    | Medium to High                 | Medium to High                 |
| **Complexity**           | Very Low                     | Low                            | High                           |
| **Tax Benefits**         | None (uses post-tax money)   | Very High (tax concessions)    | High (interest deductibility)  |
| **Access to Funds**      | Medium (via redraw)          | Very Low (locked until retirement) | High (portfolio is liquid)     |

---

## How to Model Your Options

Comparing these strategies can feel abstract. While a full financial plan is the best way to compare all three, you can model the powerful effect of a debt recycling strategy against simply paying off your home loan.

Our free **[Debt Recycling Calculator](/calculators/debt-recycling)** is designed for this.

It lets you input your own numbers—loan balance, interest rates, and tax rate—to see a side-by-side projection. You can compare the timeline of just making normal repayments against a debt recycling strategy and see the potential year you could become completely debt-free by using your investment portfolio to clear all remaining debt.

**[>> Try the Debt Recycling Calculator now](/calculators/debt-recycling)**

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## Final Thoughts

There is no magic bullet.

*   **Making extra repayments** is a safe and steady path to financial security.
*   **Boosting your super** is a tax-effective, set-and-forget strategy for a comfortable retirement.
*   **Debt recycling** is an active, higher-risk strategy for those looking to accelerate wealth creation by using leverage.

The right choice depends entirely on your personal appetite for risk, your timeline, and your financial goals. Many people use a combination of these strategies. The most important step is to make a conscious decision and put your surplus cash to work.

---

*Disclaimer: This article provides general information only and does not constitute personal financial, credit, or tax advice. You should seek professional advice before implementing any of these strategies.*

A comparison of three popular Australian wealth strategies: paying down your mortgage faster with extra repayments, boosting your retirement savings with extra super contributions, or using debt recycling to invest.

Debt Recycling vs. Extra Repayments vs. Super: Which is Best?


**Compound interest** is often called *the eighth wonder of the world* — and for good reason.  
It’s interest on interest: your balance earns returns, and those returns go on to earn their own returns.  
Over time, the growth curve bends sharply upwards — a snowball effect for your savings and investments.

---

## Table of contents
1. [What is compound interest?](#what-is-compound-interest)
2. [The compound interest formula](#the-compound-interest-formula)
3. [Worked example](#worked-example)
4. [Visualising compound growth](#visualising-compound-growth)
5. [Try it with your own numbers](#try-it-with-your-own-numbers)
6. [Common mistakes to avoid](#common-mistakes-to-avoid)
7. [How to maximise compounding](#how-to-maximise-compounding)
8. [The bottom line](#the-bottom-line)
9. [FAQs](#faqs)

---

## What is compound interest?

With **simple interest**, you only earn returns on your original deposit.  
With **compound interest**, you earn on both your starting balance *and* the interest already earned.

That’s what makes compounding powerful — it converts time into your biggest ally.  
The longer you stay invested, the faster the growth accelerates, even if your contributions don’t change.

---

## The compound interest formula

`FV = P × (1 + r/n)^(n × t)`

Where:

- **FV** – future value (what you’ll have at the end)  
- **P** – starting amount (principal)  
- **r** – annual interest rate (as a decimal, e.g. 6% → 0.06)  
- **n** – number of compounding periods per year (e.g. 12 for monthly)  
- **t** – time in years

Each compounding period adds new earnings to your balance — and the next round of interest is calculated on that bigger amount.

---

## Worked example

Say you start with **$5,000**, add **$100 each month**, and earn **6% per year**, compounded monthly, for **10 years**.

| Detail | Value |
|--------|------:|
| Total contributions | $17,000 |
| Final balance | ≈ $23,500 |
| Growth from compounding | ≈ $6,500 |

That extra $6,500 didn’t come from extra deposits — it came from **time and consistency**.

> **Tip:** Regular contributions, even modest ones, matter far more than timing the market.

---

## Visualising compound growth

Think of compounding like rolling a snowball down a hill.  
At first, it’s slow and small, but each turn adds more snow and momentum.  
The early years look flat, but later growth dominates — the final stretch often adds more value than all previous years combined.

---

## Try it with your own numbers

Use the free [Compound Interest Calculator](/calculators/investment-growth) to project your savings growth.  
Adjust the interest rate, timeframe, and contributions to see how each affects your final balance.

> For a realistic view of **purchasing power**, choose an **after-inflation (“real”) return**.

---

## Common mistakes to avoid

- **Ignoring fees:** management or fund costs above 1% can significantly reduce compounding benefits.  
- **Pausing contributions:** missing months breaks the rhythm. Automate transfers to stay consistent.  
- **Chasing high returns:** steady, reliable growth compounds better than volatile bets.

---

## How to maximise compounding

- **Start early** – every extra year multiplies results.  
- **Reinvest earnings** – keep dividends or interest in the account.  
- **Increase deposits gradually** – even small annual rises compound strongly.  
- **Stay invested** – time in the market beats timing the market.

---

## The bottom line

Compound interest rewards patience and consistency.  
You don’t need a finance degree — just a plan, regular deposits, and time.

Start small, stick with it, and let compounding do the heavy lifting.

> “The best time to start was 20 years ago. The second-best time is today.”

---

**Next step:** explore the [Compound Interest Calculator](/calculators/investment-growth) and see how quickly your savings can grow.

---

## FAQs

**What is compound interest in simple terms?**  
It’s interest on both your original money and the interest that’s already built up.

**How often is interest compounded in Australia?**  
Usually **monthly** for savings accounts; some investments use quarterly or annual compounding. Check your product disclosure statement for details.

**Is compound interest taxable?**  
Yes. Interest from savings or investments is part of your **assessable income** and taxed at your marginal rate, unless held inside **superannuation**.

**Which is better — monthly or annual compounding?**  
Monthly or quarterly generally yields slightly higher returns, as interest is added more frequently.

**How can I calculate it easily?**  
Use the [Compound Interest Calculator](/calculators/investment-growth). It applies the formula automatically and shows your projected balance.

**Can compounding work against you?**  
Yes. With **debt**, compound interest accelerates what you owe if you don’t make repayments — especially on credit cards. Clear high-interest debts first before focusing on investing.

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*Disclaimer: This article is general information only and does not constitute financial advice. Past performance is not a reliable indicator of future results.*


A plain-English explainer of compound interest with step-by-step examples, the core formula, and a free calculator to test your own numbers.

#investing

Debt Recycling vs. Extra Repayments vs. Super: Which is Best?

Compound Interest Explained: How Your Money Grows (With Examples)