A Practical Framework for High-Income Families Weighing Tax Savings, Flexibility, and Future Access
At Three Kings Wealth Management, one of the most common questions we get from high-income clients is whether they should direct their extra income into superannuation or use it to pay down their mortgage faster. It’s a particularly timely question given rising interest rates, cost-of-living pressures, and the importance of building long-term financial flexibility.
Let’s break down this decision using a practical framework, especially relevant for families juggling multiple financial priorities.
Example Client Query:
“I’m 42, earning $220K household income, 2 kids in private school, have $600K mortgage left, $400K super — should I focus on extra super contributions or paying off mortgage faster before rates change again?”
This scenario is a perfect case study. At age 42 with significant income, a sizeable mortgage, and private school fees, every dollar must work efficiently across the short, medium, and long term.
Step 1: Define Your Goals Across Three Time Horizons
- Short-term (1–5 years): School fees, living expenses, holidays, liquidity.
- Medium-term (5–15 years): Mortgage reduction, investment property, early access to funds.
- Long-term (15+ years): Retirement readiness, superannuation growth, tax planning.
Your strategy should balance all three — and each option (super or mortgage) affects them differently.
Step 2: Understand the Trade-offs
🏠 Paying Down the Mortgage
- Pros:
- Guaranteed return: Every extra repayment saves interest at your mortgage rate (e.g. 6%).
- Reduces debt faster, improving financial security.
- Accessible equity if needed later (via redraw or refinance).
- Cons:
- Less tax efficiency than super contributions.
- Doesn’t benefit from long-term compounding like super can.
🧓 Contributing to Super
- Pros:
- Tax-deductible contributions (concessional contributions taxed at 15% vs. 37%+ marginal rates).
- Potential for strong long-term investment returns, especially with compounding over 20+ years.
- Valuable for retirement planning and wealth accumulation.
- Cons:
- Funds locked away until preservation age (typically 60).
- Less accessible for medium-term goals or emergencies.
Step 3: Layer in Flexibility — The Offset Account Strategy
Follow-up Query: “Can I use an offset account to balance both strategies?”
Absolutely. This is where you can get the best of both worlds:
- Direct your surplus funds into a 100% offset account linked to your mortgage.
- You’ll reduce interest just like a repayment but maintain full access to the funds.
- Later, decide whether to move some of that cash into super at the right time (e.g. closer to end of financial year for tax planning).
This approach creates a “flexible buffer” that supports both liquidity and debt reduction.
Step 4: Compare the Numbers — Super Tax Benefits vs Mortgage Interest
Follow-up Query: “How do tax benefits compare between super and mortgage repayments?”
Let’s assume:
- You contribute $15,000 extra into super from pre-tax income.
- At a 39% marginal tax rate (including Medicare), this saves you $5,850 in tax upfront.
- That $15,000 is taxed at 15% in super ($2,250), leaving $12,750 invested.
- Compare this to using $15,000 to pay down your mortgage at 6% — you’d save $900 in interest in the first year.
Verdict: Over time, super wins for long-term growth and tax efficiency — if you can afford to lock the money away.
Step 5: Future Access & Life Events
Follow-up Query: “What if I want to access funds before preservation age?”
This is a critical question. If you’re planning:
- A business venture,
- Helping kids with a deposit,
- A significant home upgrade…
…then prioritising mortgage repayments or offset savings keeps your options open. Super, while powerful for retirement, isn’t designed for mid-life access.
So, What’s the Best Move?
Here’s a Practical Recommendation:
- Use an Offset Account to park surplus cash, reducing interest while retaining access.
- Top up Super Strategically — particularly near EOFY to take advantage of contribution caps and tax deductions.
- Review Annually — revisit the strategy each year as interest rates, school expenses, and your income change.
Final Thought
There’s no one-size-fits-all answer — and that’s the point. The decision between extra super and mortgage repayments isn’t just about numbers. It’s about control, access, goals, and life stage.
At Three Kings Wealth Management, we specialise in helping high-income families like yours craft a custom strategy that evolves with you.
Want to run the numbers for your family?
Book a 2 hour consultation with our financial planning team — and get clarity on what’s right for you.
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