Tax loss harvesting for retirees: strategic loss realisation in personal-name portfolios

For retirees with substantial investment portfolios held in their own name — outside superannuation — tax loss harvesting is one of the more useful and underused tax planning tools available. The mechanism is straightforward: by deliberately realising capital losses in investments that have declined in value, those losses can be offset against capital gains realised elsewhere in the same financial year, reducing the overall CGT liability. Done well, harvesting integrates naturally into an annual rebalancing process and can produce meaningful tax savings year after year, particularly during the volatile periods when loss opportunities are most readily available.

How the mechanics work

Capital losses reduce capital gains under Division 102 of the Income Tax Assessment Act 1997. In the same financial year, capital losses offset capital gains directly — a $25,000 capital loss reduces a $25,000 capital gain to zero, and the tax otherwise payable on the gain is not incurred. Losses that exceed gains in a given year carry forward indefinitely to offset future gains; they cannot be carried back to prior years.

The 50% CGT discount (ITAA 1997 Division 115) applies to gains on assets held for more than 12 months, reducing the taxable amount by half before the marginal rate is applied. For a retiree on the top marginal rate of 47% (45% plus the 2% Medicare Levy), a discounted capital gain of $25,000 produces $5,875 in tax ($25,000 × 50% × 47%). A capital loss of $25,000 realised in the same year eliminates that liability entirely. For retirees with substantial personal-name portfolios who are regularly rebalancing — and therefore regularly realising gains — the available losses in the portfolio in any given year deserve specific review before the financial year closes.

The anti-avoidance constraint: genuine investment intent

Australia does not have a specific "wash sale rule" as found in US tax law. What it does have is the Part IVA general anti-avoidance provision (ITAA 1936, Part IVA), which applies where the dominant purpose of a transaction is to obtain a tax benefit rather than to make a genuine investment decision. Selling an investment to realise a loss and immediately repurchasing the identical investment — with no change in economic exposure and the sole purpose of manufacturing a deductible loss — risks Part IVA challenge. The ATO has published guidance on artificial loss arrangements in this context.

The practical response is the substitute investment approach: rather than repurchasing the identical holding, the retiree sells the loss-making investment and buys a similar but different investment that maintains broadly comparable market exposure. Selling Vanguard Australian Shares Index ETF (VAS, which tracks the ASX 300) and buying iShares Core S&P/ASX 200 ETF (IOZ, which tracks the ASX 200) achieves a similar Australian equity exposure through a genuinely different product — a different index, different composition, different manager — rather than an artificial round-trip in the same security. The approach maintains the portfolio's strategic allocation while capturing the loss through a legitimate change in investment vehicle.

Combining harvesting with annual rebalancing

The natural integration point for tax loss harvesting is the annual rebalancing review. Rebalancing involves selling whatever has grown beyond its target allocation (realising gains) and buying whatever has fallen below target (realising no gain on those purchases, but maintaining or building positions). When harvesting is added to the rebalancing process, the review also identifies holdings in any asset class that are sitting at a loss relative to cost base — and those losses are captured by selling those positions and reinvesting in substitutes, netting against the gains realised from the overweight positions.

The result is a single integrated annual process — rather than two separate exercises — that combines allocation management with tax efficiency. For substantial portfolios with active rebalancing, this can produce tax savings that dwarf the transaction costs involved.

A worked illustration

A 65-year-old retiree holds $800,000 in personal-name investments: $500,000 in Australian shares with an embedded gain of $50,000, and $300,000 in international shares that includes some holdings with $25,000 in unrealised losses. She plans to rebalance toward Australian shares, which means selling some international holdings.

Without harvesting, she sells $100,000 of Australian shares to take profits on an overweight position, realising a proportional capital gain of $25,000. After the 50% CGT discount, $12,500 is taxable at her 47% marginal rate: approximately $5,875 in tax.

With harvesting, she also identifies the international holdings sitting at a $25,000 loss and sells those in the same financial year, realising the $25,000 capital loss. The $25,000 gain from the Australian share sale is fully offset by the $25,000 loss. Net taxable capital gain: zero. She then buys a substitute international ETF to maintain her international equity exposure. The net tax saving is approximately $5,875 for this single rebalancing exercise.

Across a full working year — with multiple rebalancing decisions, dividend reinvestment, and occasional portfolio restructuring — the cumulative harvesting benefit for a substantial portfolio can be considerably larger.

When harvesting is not relevant

For retirees whose investments are entirely in pension-phase superannuation, tax loss harvesting is irrelevant. Pension-phase super has zero percent earnings tax, meaning there are no taxable capital gains to offset within the fund. The strategy only applies to assets held in personal name or in structures that are subject to CGT.

For retirees with small portfolios, the transaction costs of selling and repurchasing may exceed the tax benefit. For those with large embedded franking credits on Australian shares in low-tax positions, the franking refund may dominate the after-tax calculation regardless of CGT management. For retirees who intend to hold investments until death — allowing beneficiaries to acquire assets at market value with a reset cost base — preserving unrealised losses may be less important than maintaining long-held positions. Each of these considerations is a reason to evaluate the strategy in the context of the specific portfolio and tax position rather than applying it mechanically.

Sources

• Using capital losses to reduce capital gains (ATO)
• CGT discount (ATO)
• Wash sales: the ATO is cleaning up dirty laundry (ATO)
• Tax rates – Australian resident (ATO)
• Exempt current pension income (ATO)