Tax-Loss Harvesting

Tax-loss harvesting is the deliberate realisation of a capital loss to offset capital gains - usually in June, before the financial year closes. The loss reduces the taxable gain dollar for dollar, and when the gains arrive with the 50 percent discount attached, a $10,000 loss still offsets $10,000 of discounted gain while saving tax at the discounted rate. The mechanics are simple; the Australian rules are not. The ATO's anti-avoidance rule - Part IVA, guided by Taxation Ruling TR 2008/1 - can deny a loss where the disposal was done mainly for tax and the economic position never changed.

The Australian version of harvesting therefore has a structural requirement: the exposure must genuinely change. Selling a losing ETF and buying the identical one back a week later is a wash sale - the ATO sees the same economic exposure either side of the disposal, and Part IVA can deny the loss entirely. The workarounds are real: switch to a similar-but-not-identical fund from a different index provider, wait before repurchasing, or rebalance into a different holding that keeps the market exposure while changing the asset. The capital loss entry covers the offset mechanics the harvesting depends on.

The June arithmetic is the mechanism. An $8,000 unrealised loss on a tech ETF in June, offset against $8,000 of discounted gains from the rest of the portfolio, saves $1,280 at a 32 percent marginal rate - the discounted gain is taxed at 16 percent effective, and the loss removes it dollar for dollar. Against gains held under twelve months the same loss saves $2,560, because the full marginal rate applies. The loss must be realised before 30 June to land in the current year, and the disposal date - the trade date, not settlement - decides which year it lands in.

The wash-sale rule is the Australian constraint. Taxation Ruling TR 2008/1 lists the factors: whether the economic exposure changed, whether the asset was repurchased in the same or similar form, and whether the disposal was done mainly for a tax benefit. Selling the ETF and repurchasing the identical fund a week later fails all three - the ATO's data matching sees both trades, and Part IVA can deny the loss plus penalties. A switch to a fund tracking a different index, a wait long enough to be defensible, or a rebalance into a different asset changes the exposure and keeps the loss.

The cost base reset is the honest cost. Harvesting at a lower price lowers the cost base of the replacement holding, so the next sale carries a larger gain: $8,000 saved now becomes roughly $1,280 of extra tax later on the same growth, and the deferral is the entire benefit. The strategy works best in years with both gains and losses, and the tax-loss harvesting calculator prices the net position on any pair. Without gains to offset, the harvest realises nothing but a tax attribute and a brokerage fee.

For an Australian reader, harvesting is the June habit that pairs with the capital gains tax entry - the discount rewards holding, and the loss offsets the gains the holding produced. The ATO is the authority on both sides: the offset is legitimate, and the wash-sale guidance is the line the strategy cannot cross. MoneySmart's guidance on shares treats losses as part of the total return. The self-directed investor is the one who has to do the matching, because no platform will do it for you. The brokerage is the small cost; the denied loss is the large one.

A colleague named Brent (yes, that Brent) sold a losing ETF and bought the identical one back in the same account a week later, because that was the American version of the strategy he had read. The loss looked harvested; the ATO saw no change in economic exposure either side of the disposal. The wash-sale guidance denied it. The highest-leverage thing most Australians can do is change the exposure when harvesting - a different fund, a longer wait - and match the loss against actual gains before 30 June. Run the pairing through the marginal tax rate entry before the trade, not after.