Australia Prediction Market Tax Treatment

Last updated: April 2026 · For Australia residents · Tax body: ATO (Australian Taxation Office)

The Australian Taxation Office distinguishes between casual gambling (generally not taxable) and professional/business gambling (taxable as ordinary income). Prediction markets sit in an unusual position because their classification depends on platform type and trader behavior.

Gambling vs investment classification

Gains from Betfair, Sportsbet, and other ASIC-aligned betting operators are generally NOT taxable for casual users — Australia does not tax gambling winnings for casual punters. However, this only applies if you are not running a business of gambling.

Professional gambler exemption

If you trade prediction markets systematically with profit-seeking intent, the ATO may classify you as carrying on a gambling business, making gains taxable as ordinary income. Factors include: frequency, volume, capital invested, business-like methodology, and whether it is your main source of income.

CGT treatment of gray-market platforms

Polymarket and other crypto-settled platforms are NOT classified as gambling by the ATO — they are generally treated as crypto-asset transactions, triggering CGT events on each trade. You must calculate gain/loss in AUD for each disposal, using the daily exchange rate.

Record-keeping requirements

For each trade on a gray-market platform: date, AUD value at trade time, market description, position size, cost basis, proceeds, net gain/loss. The ATO can require records for 5 years from the date of the relevant return.

Crypto-to-crypto disposals

Trading USDC for a Polymarket contract is itself a CGT event under ATO crypto guidelines. This creates significant compliance overhead for active traders — many small CGT events that must be tracked individually.

Disclaimer

This guide is general information about prediction market tax treatment in Australia as of April 2026. It is not personal tax advice. Tax law changes frequently and applies differently to each individual situation. Consult a qualified tax professional in Australia before making decisions.