In Brief

1. Australia has no standalone wash sale statute, but the ATO applies Part IVA of the Income Tax Assessment Act 1936 to sell-and-buy-back arrangements where the dominant purpose is to generate a capital loss for offset — regardless of the time window between disposal and reacquisition.

2. The ATO's Crypto Assets Data-Matching Program covers exchange-level trade data from the 2014-15 to the 2025-26 financial years, giving the ATO near-real-time visibility of digital asset transactions at major exchanges.

3. Crypto-to-crypto swaps — including BTC to ETH, swaps into stablecoins, and movements to DeFi protocols — are treated as disposal events for capital gains tax purposes; each creates a separate CGT event requiring a cost base calculation. It is December. You hold a portfolio of altcoins that are down 60% from their purchase price. The logic seems obvious: sell now to realise the capital loss, offset your Bitcoin gains from earlier in the year, and repurchase the same coins in January when the tax year has turned. In the United States, the 30-day wash sale rule under Section 1091 of the Internal Revenue Code applies to securities — though its application to cryptocurrency is still the subject of legislative debate. Australia has no equivalent statutory rule. But that does not mean the strategy is safe. The ATO uses Part IVA of the Income Tax Assessment Act 1936 — the General Anti-Avoidance Rule — to challenge arrangements where the dominant purpose is obtaining a tax benefit. It has confirmed publicly that wash sale arrangements involving crypto assets are within scope. For digital asset investors, understanding where this line sits is not optional.

How Part IVA applies to digital asset wash sales Part IVA does not require a specific time window. The ATO analyses transactions by reference to eight statutory factors identified in Taxation Ruling TR 2008/1 (Income Tax: Application of Part IVA to Wash Sale Arrangements), with primary weight given to the manner of execution and the economic substance of the result. Where a taxpayer sells a digital asset, generates a capital loss, and then reacquires a substantially identical asset — with the net result that their economic position is unchanged but their tax position has improved — the ATO treats this as an artificial arrangement. The key question is whether the taxpayer's economic position changed. If you held 10 BTC before the sale and hold 10 BTC after the repurchase at a similar price, the ATO's position is that no genuine economic disposal occurred. The manufactured loss is disallowed. The penalty framework under Subdivision 284-C of the Taxation Administration Act 1953 provides for a 50% scheme-specific penalty for arrangements subject to Part IVA, rising to 75% where the taxpayer had no reasonably arguable position. The Full Federal Court affirmed the ATO's approach to wash sales in Commissioner of Taxation v Merchant (April 2025), confirming that Part IVA can apply even where individual transactions are commercially

---

Disclaimer: This article is for general informational purposes only and does not constitute legal, tax, or financial advice. Readers should seek professional advice tailored to their specific circumstances. Information reflects the position as of the publication date and may be subject to change. This article addresses UAE, Australian, UK, and Canadian law where specified; different rules apply in other jurisdictions. © 2026 Alldren. All rights reserved. This article addresses Australian tax law. Readers should seek advice from a qualified Australian tax adviser before making any decisions about digital asset transactions or cross-border structuring.