What Is Debt Recycling?
Debt recycling is a strategy that converts non-deductible home loan debt into tax-deductible investment debt, simultaneously reducing your mortgage and building a tax-efficient investment portfolio. It's one of the most powerful wealth-building strategies available to Australian homeowners — and one of the most misunderstood.
The Core Concept
Australian tax law allows you to deduct the interest on loans used to purchase income-producing investments (shares, ETFs, investment property). Interest on your home loan is not deductible — it's personal debt. Debt recycling converts the non-deductible home loan into deductible investment debt through a repeating cycle.
The key insight: every dollar of home loan you pay off can be immediately re-borrowed as investment debt — if your loan structure allows it. The total debt stays the same, but the proportion that's tax-deductible increases with each cycle.
The Debt Recycling Process
This is the exact sequence, repeated monthly or whenever surplus cash is available:
Why It Works: The Tax Maths
Assume you have a $500k home loan at 6.5%. Over one year with $2,000/month in extra repayments, you've paid down $24k in principal. You immediately redraw $24k and buy ETFs.
After Year 1: You have $24k of ETFs and $24k of deductible investment debt. The interest on that investment split ($24k × 6.5% = $1,560) is deductible. At a 37% marginal rate: $577 tax refund.
After 10 years of cycling $2k/month plus reinvesting tax refunds and dividends: you've converted roughly $280k of home loan into investment debt. The annual tax deduction on that investment split is ~$18,200/year — a $6,700 refund annually. Plus the ETF portfolio has grown.
The compounding advantage: Tax refunds + dividends + franking credits all get recycled back into the mortgage, accelerating the next cycle. The benefit compounds — each cycle converts more debt and generates a larger deduction.
Loan Structure Requirements
Debt recycling requires a specific loan structure. Your lender must offer a loan split — separating your mortgage into two portions with separate accounts and separate interest tracking:
- Non-deductible split: The original home loan. Repayments reduce this balance.
- Investment split: The redrawn investment debt. This must remain completely separate — never mixing with personal spending.
Contamination risk: If you deposit salary into the investment split, or pay personal expenses from it, the ATO may disallow the interest deduction on the entire split. The investment split must be used only for investment purchases and must receive only investment income. One contamination can destroy years of deductions. Keep the accounts completely separate.
Who Should Consider Debt Recycling
- Income above $120k. The 37% or 45% marginal rate makes the tax deduction worth significantly more. At 19% marginal rate, the benefit is much smaller.
- Existing home with mortgage. You need non-deductible debt to convert.
- Stable employment income. The investment debt sits against your home. If income drops, the leveraged position can be stressful.
- Long-term investor mindset. The ETF portfolio must be held through market cycles. Selling during a downturn to pay off the investment debt triggers CGT and unwinds the structure.
- Good record-keeping habits. The ATO can ask for transaction logs going back several years. Every investment purchase, interest payment, and dividend must be documented.
Debt Recycling Calculator coming soon
We're building a full debt recycling calculator — step-by-step workflow, ATO-ready interest log, and 15-year projection. Until then, use the mortgage calculator to model your repayment acceleration.
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