Margin loans approaching retirement: when leverage stops earning its keep, and how to unwind cleanly

For Australians who built their wealth using margin loans during the 2000s and 2010s, the structure that worked well in accumulation years presents a different question in the pre-retirement window. The portfolio that compounded effectively under leverage with twenty years of working income to absorb interest costs and ride out drawdowns is now sitting on a five-to-ten year horizon to retirement, with a different risk profile and a different income context. The case for keeping the leverage shifts; the case for unwinding has to confront its own complications. The right approach is rarely abrupt — it is structured, multi-year, and coordinated with the broader retirement transition.

The structural arguments against continuing leverage into retirement are three. The first is income service. Working income, which has been comfortably absorbing interest expense and covering any shortfall between dividend yield and loan rate, is about to end. Post-retirement income — super pension drawdowns, residual employment income, dividends, possibly Age Pension — is typically lower and less reliable. Loan service does not become impossible, but it becomes a more constrained part of the budget.

The second argument is sequence-of-returns risk amplification. Leverage cuts in both directions. In a working portfolio with twenty-plus years of horizon, a 30% market drawdown is unwelcome but recoverable; the leverage adds magnitude but the time horizon absorbs the volatility. In a retirement portfolio that needs to fund living expenses, a 30% drawdown amplified by 50% leverage to a 50–60% effective drawdown can produce permanent damage. Worse, the margin loan operationally prohibits drawdowns during downturns: when the retiree most needs to be drawing income, the lender may be issuing margin calls demanding the opposite — additional funds or forced sales. The structural feature of leverage that creates risk is at its most dangerous precisely when retirement income reliance is at its highest.

The third argument is tax position. Interest deductibility is most valuable when offset against high-marginal-rate income. As retirement reduces taxable income — sometimes to zero, particularly for retirees primarily drawing from super in pension phase — the deduction loses value. The pre-tax interest cost progressively approaches the post-tax cost. The original strategy worked because the deduction subsidised the borrowing; in retirement, the subsidy is largely gone.

These three forces produce a structural review question in the pre-retirement window: how to unwind the margin loan position on a timeline that preserves wealth and minimises disruption?

The unwinding itself is not without complications. Selling underlying shares to repay the loan crystallises capital gain or loss. For a portfolio held for over twelve months, the 50% CGT discount applies for individuals. For a long-held leveraged portfolio with substantial embedded gains, full sale in a single year produces a large addition to assessable income at high marginal rates. A portfolio with $400,000 cost base and $1,000,000 current value crystallises $600,000 of capital gains, with $300,000 (post-discount) hitting assessable income. At a 32% marginal rate (the 30% bracket plus Medicare under 2025-26 Stage 3), the tax bill on that single-year disposal is roughly $96,000.

Splitting the disposals across multiple financial years — selling $200,000 of gains across three years, for example — typically produces a meaningfully lower total tax bill, because the income is absorbed at lower marginal rates each year. Coordination with the retirement timing matters: the first year of retirement, when working income has stopped but the retiree may not yet be drawing super, often presents the lowest marginal rate window. CGT crystallised in this year is taxed lightly.

Carry-forward concessional contributions to super provide an additional offset. If the pre-retiree has unused concessional contribution caps from prior years and is below the $500,000 Total Super Balance threshold, catch-up contributions in the year of largest disposal can reduce assessable income and thus the CGT bill. The cash from disposals also flows productively into super at tax-favoured rates, subject to applicable contribution caps and age-related contribution rules.

The unwinding period itself carries margin call risk. A market downturn during the structured exit can compress the timeline and force suboptimal sequencing. Mitigation includes reducing LVR before commencing the structured unwinding (perhaps to 30–40% from the original 60%), maintaining a cash buffer outside the loan to absorb a margin call without forced sales, and pre-committing to specific market levels at which the unwinding will accelerate.

A specific Centrelink consideration is worth flagging for pre-retirees near the Age Pension assets test cut-off. The Age Pension assets test treats leverage net — assets minus liabilities. A $1 million share portfolio with a $500,000 margin loan is assessed at $500,000, not $1 million. Holding the loan can therefore preserve Age Pension entitlement. Unwinding the loan returns the full $1 million to assessable assets, which reduces ongoing pension entitlement. For pre-retirees near the cut-off, the cumulative Age Pension impact over a 15–20-year retirement can rival the structural arguments against the loan. The decision is genuinely two-sided in this scenario, and the modelling matters.

For pre-retirees who want to retain some leverage but exit the margin loan structure specifically, a home equity loan or line of credit on the principal residence can substitute. Rates are typically lower than margin loan rates, and there is no daily mark-to-market that triggers margin calls. Interest deductibility tracks the purpose of the loan (whether the borrowed funds are used for income-producing investments) rather than the collateral, so the deduction can typically be preserved. The trade-off: the home becomes the security, so default puts the home at risk rather than the share portfolio.

For most pre-retirees with an existing margin loan, the right approach is multi-year, structured, and integrated with the broader retirement transition. The unwinding plan covers CGT staggering, super contribution coordination, margin call mitigation, and Centrelink positioning. Bench a single-year exit and an unstructured one against a planned three-year exit and the difference can run to tens of thousands of dollars in tax alone, and many times that in avoided sequence risk if a downturn intervenes.

This is exactly the kind of pre-retirement decision where adviser-led modelling matters. The interaction between leverage, CGT, contributions, market timing, and Age Pension is multi-variable and the right answer depends on the specific numbers.