Matched betting is taxable in Australia only when the betting behind it is carried on as a business, and the ATO's ruling IT 2655 treats that as the exception. For most people, betting winnings are not assessable income and betting losses are not deductible. Arbitrage, bonus bet conversion and automated betting are judged by the same test, with no separate rule for any of them.
Matched betting and arbitrage run on a system, usually across several bookmakers and at high turnover, and system and organisation are among the signs of a business the ruling weighs. That makes the question worth more thought than it gets for weekend punting, but the answer for any one person still depends on the facts.
One business test covers every betting method
IT 2655 is the ATO's ruling on whether a taxpayer is carrying on a business of betting or gambling. It dates from 17 October 1991 and does not mention matched betting, arbitrage or betting software, so nothing in it treats them differently from other betting. Tax on betting profits from a systematic method is judged on the same criteria as any other betting. Those criteria are a systematic and organised approach, the volume and size of the betting, any link to other business such as horse breeding, and whether profit is the principal aim.
The ATO's general guidance on hobbies points the same way. Carrying on a business usually involves ongoing, repeated activity with the intention of making a profit, often with records kept, while one-off transactions with no profit intention point away from one. The three Federal Court cases behind the ruling are set out in professional gambler tax in Australia, and the general position on winnings, prizes and won assets is in tax on gambling winnings.
Note: Checked against the ATO's published ruling and guidance on 7 October 2026. This is general information, not tax or legal advice, and IT 2655 itself says each case depends on its own facts.
Why matched betting and arbitrage raise the business question
Set the factors beside how matched betting and arbitrage work, and several line up. The right-hand column describes the methods, not any one person.
| What the ruling weighs | What IT 2655 records | How systematic methods typically look |
|---|---|---|
| System and organisation | In Evans, the missing element was system or organisation: no records, no computer, no information services | A fixed method, calculators and spreadsheets, and a record of every bet |
| Getting the best price | In Evans, a punter in business would be one whose betting is systematically conducted to get the most favourable odds obtainable | Comparing prices across bookmakers and an exchange is the method |
| Volume and size | Relevant, but never enough by themselves (Evans) | Many bets at thin margins, so turnover is large next to the result |
| Profit or pleasure | Which of the two is the principal reason for betting | The aim is usually the return rather than the contest |
| Chance and skill | Chance as a predominant ingredient pointed away from a business in Babka, and skill makes tax consequences more likely | A bet laid off on an exchange reduces how much one result matters, though prices, matching and settlement still vary |
| Other businesslike activity | Other business in the racing industry makes a business more likely | Often none |
Two lines from the cases matter most for these methods. The Evans line in the table describes price comparison closely, since getting the best available odds is central to arbitrage and to much of matched betting. Babka went further: Justice Hill accepted that technology such as computers could make punting businesslike enough to count as a business.
None of that settles a case. Volume, a computer or a spreadsheet does not decide it alone, and IT 2655 says that, as at 1991, there was no Australian case in which a mere punter's winnings had been held assessable. The point is narrower: a systematic method sits nearer the businesslike end of the factors than casual betting does, so the question deserves a real answer rather than an assumption.
Turnover, bonus bets and what the statements show
Two illustrative cases show how systematic betting looks on paper.
Thin margins mean high turnover
Arbitrage betting backs every outcome of a market at different bookmakers, so the margin on the total staked is small. Assume an illustrative average profit of 1.5% of the total staked, on arbitrages where both legs stand. Finishing a year $3,000 ahead then takes stakes of 3,000 / 0.015 = $200,000. At $400 staked across both legs of each arbitrage, that is 200,000 / 400 = 500 arbitrages, or about 500 / 52 = 9.6 a week. Volume and repetition on that scale are the kind of facts the ruling weighs, even when the profit is modest.
One matched bonus bet on two statements
A bonus bet is a betting credit a bookmaker issues to your account, and an Australian bonus bet normally pays only its winnings, because the stake is not returned. In this illustrative case a $50 bonus bet goes on at $5.00 with Bookmaker A and is laid on a betting exchange at $5.20, with commission at an illustrative 5% of net winnings in the market.
- Lay stake = bonus x (back odds - 1) / (lay odds - commission) = 50 x (5.00 - 1) / (5.20 - 0.05) = 200 / 5.15 = $38.83
- Liability = lay stake x (lay odds - 1) = 38.83 x (5.20 - 1) = $163.09
| Result | Bookmaker A statement | Exchange statement | Combined |
|---|---|---|---|
| The selection wins | Winnings of 50 x (5.00 - 1) = $200.00, no stake returned | Liability lost: -$163.09 | 200.00 - 163.09 = $36.91 |
| The selection loses | Nothing: a bonus bet that loses pays nothing | 38.83 x (1 - 0.05) = $36.89 after commission | $36.89 |
Either statement alone gives the wrong picture: one shows a $200 win or nothing, the other a $163.09 loss or a $36.89 gain. Only the two together show the real result, about $36.90 either way. The matched betting guide explains the method itself. The bonus bet converter works out the lay stake and liability for a bonus bet, and the arbitrage calculator gives the stake split for an arbitrage.
Risk: Betting involves risk. An arbitrage or a middle only works if every bet is accepted at the price shown, and a bonus bet that loses pays nothing. Prices move, a lay may not be matched and bookmakers can void bets or restrict accounts, so there is no guarantee of profit. See responsible gambling for limits and support.
Records to keep for matched betting and arbitrage
Systematic betting produces more records than casual punting, and these are what you, or a tax agent, would need to show the activity as it is. Records are one of the indicators the ATO lists for a business, but no single indicator decides it, and you need them whichever way the question falls.
| Record | Why it matters | Where it comes from |
|---|---|---|
| Every bet: date, bookmaker, event, market, odds, stake, and whether the stake was cash or a bonus bet | Shows the method and its scale | Your bookmaker account history |
| Every lay: stake, odds, liability and commission | The other half of each matched bet | Your exchange account statement |
| Each promotion: type, face value, expiry and what it returned | Shows how much of the activity rests on promotions | Your bookmaker account and messages |
| Monthly totals, reconciled to each provider's statement | Ties your own records to official ones | Monthly activity statements |
| Costs: software, data and subscriptions | Relevant to tax only if the activity is a business | Receipts and invoices |
| Time spent each week | The ATO asks for it when deciding whether someone carries on a business | Your own log |
Online wagering providers licensed in Australia must send active accounts a monthly activity statement and keep at least 7 years of transaction records available, so gaps can be filled later. The betting activity statements guide explains what each one shows. Keep your own records at least as long as the ATO's general rule for tax records, 5 years from the date you lodge a return.
Enter each bonus bet at its face value with a note that the stake was the bookmaker's, record what it returned, and keep bonus bets apart from cash stakes. A losing bonus bet then shows as a bet that returned nothing, not as a cash loss.
Mistakes systematic punters make with tax
| Mistake | What applies instead |
|---|---|
| Treating matched betting as tax free in every case | For most people the winnings are not assessable income, but that changes if the betting is carried on as a business |
| Assuming a hedged method is not betting at all | Each leg is a bet, and IT 2655 covers betting and gambling generally |
| Reading one account's statement as the result | A matched bet or an arbitrage only nets out across both accounts |
| Counting a losing bonus bet as a cash loss | It returned nothing, but it cost no cash either |
| Deducting software or data costs while treating winnings as not assessable | Costs come into it only if the activity is a business |
| Expecting a computer or software to decide the question | System is one factor among several, and the facts decide |
Tax, legality and bookmaker terms are separate questions
Tax asks whether winnings are income. Whether a method is allowed is another question with two parts: what the law says, covered in is arbitrage betting legal in Australia under the Australian betting laws hub, and what each bookmaker's terms say. Many bookmakers restrict or prohibit automated betting, third-party access to accounts and multiple accounts in their terms, and a bookmaker can limit stakes, void bets or close an account. Why bookmakers restrict accounts explains how that happens. That risk sits with the account holder, and none of this is legal advice.
Getting an answer for your own situation
A registered tax agent can test the factors against your records; check the agent on the Tax Practitioners Board's public register first. For an answer the ATO must follow when it applies to you and you rely on it, you can apply for a private ruling. Either way, the records come first: the ATO's list for that question runs from when the activity began and what records exist to the hours spent on it each week.