Arbitrage Betting Quora Questions, Answered for Aussies
- A lock exists when the implied percentages of every outcome, each at its best available price, add up to less than 100%.
- Typical locks are small, around 1.2% to 1.9% in recent AUOdds data, so returns come from many careful bets rather than one big result.
- Only use licensed Australian bookmakers, and check any operator with the ACMA before opening an account.
- Prices move, stakes get limited, bets can be voided and mistakes happen, so every lock carries real execution risk.
- Online in-play sports betting isn't offered to Australians, so overseas advice built on live betting doesn't apply here.
Arbitrage betting Quora threads ask the same questions again and again, but the answers usually come from the UK, US or Europe, cite nothing and assume betting options Australians don't have. This guide answers 15 of the most common questions for Australian readers only. Each answer is short and practical. Where tax, legality or self-exclusion is involved, it points to an official Australian source. You'll find a plain explanation of how a lock works and a worked stake example with real-looking decimal odds. You'll also find honest numbers on typical returns and the risks forum answers tend to skip: moving prices, limited accounts, voided bets and simple human error. Read it once from start to finish, then keep it handy as a reference.
What is arb betting, explained in plain terms?
1. What is arbitrage betting? People type "arbitrage betting explained simple" into search engines because forum answers get technical fast. Here is the plain version.
Different bookmakers price the same event differently. Occasionally the gap is wide enough that backing every outcome costs less than the total you get back, whichever side wins. To get there, you take each outcome at its best available price. Australians usually call that a lock.
2. Why do bookmakers' prices differ at all? Each bookmaker sets its own odds, manages its own liabilities and updates at its own pace. One bookmaker might shorten a favourite after a team announcement while another is still a minute behind. Locks appear in those small timing differences.
3. How do I tell if a set of prices is a lock? Here is arb betting explained in one line. Convert each price to a percentage by dividing 1 by the decimal odds, then add the percentages up. If the total is under 100%, the prices form a lock. The further under 100% the total sits, the bigger the return at the prices shown.
- Two outcomes at 2.05 and 2.00: 48.8% + 50.0% = 98.8%, a lock
- Two outcomes at 1.95 and 1.95: 51.3% + 51.3% = 102.6%, not a lock
Every outcome in the market must be covered. In a match where a draw is possible, a two-way calculation that ignores the draw is not a lock at all. Overseas answers make this error often.
Arbitrage betting: does it work, and what does it return?
4. Does it actually work? People who search "arbitrage betting does it work" usually want a yes or no.
The honest answer is that the maths works, but execution is where people come unstuck. A lock locks in a return at the prices shown. That only holds if you get every leg on at those prices and at the stakes you planned, and all the bets stand.
5. How big is a typical return? It is smaller than most forum posts suggest. AUOdds data shows a typical lock of about 1.2% over the last 30 days and about 1.9% over the last seven days.
On a $500 total outlay, 1.2% is roughly $6. Returns build up from many small locks, not one big hit. A single mistake can wipe out the return from several.
6. How often do locks appear? It depends on three things:
- the sporting calendar
- how many bookmakers you hold accounts with
- how quickly you see the gap
AUOdds data covers 73 bookmakers and about 15,000 prices at any moment, with prices about 10 seconds old. That speed matters because most locks close quickly once one bookmaker adjusts.
Practical takeaways:
- More accounts at licensed Australian bookmakers means more chances to cover each leg.
- Fresh prices matter more than big percentages. A 3% lock on stale prices is worth nothing.
- Track every lock in a spreadsheet so you know your real return, not your hoped-for one.
How do you work out the stakes on a lock?
7. How do I split my stakes? Divide your total outlay in proportion to each outcome's implied percentage. Here is a short worked example on a pre-match tennis match.
- Player A at 2.05 with Bookmaker 1: 1 ÷ 2.05 = 0.4878
- Player B at 2.00 with Bookmaker 2: 1 ÷ 2.00 = 0.5000
- Total: 0.9878, so the market sits at 98.78%
With a $500 total outlay:
- Stake on Player A: $500 × 0.4878 ÷ 0.9878 = $246.91
- Stake on Player B: $500 × 0.5000 ÷ 0.9878 = $253.09
- If Player A wins: $246.91 × 2.05 = $506.17
- If Player B wins: $253.09 × 2.00 = $506.18
That is about $6.17, or roughly 1.2%, locked in at the prices shown.
Some bookmakers won't accept cents. Rounding to the nearest dollar ($247 and $253) shifts each outcome by only a few cents, which is fine. Rounding too aggressively can turn a thin lock into a small loss on one side.
In tennis, also check each bookmaker's retirement rule. Bookmakers don't all settle a mid-match retirement the same way.
8. What if a price moves before I place the second bet? This is the most common problem.
- Place first the leg most likely to move, usually the bigger price.
- If the second price drifts, recalculate straight away.
- You may be able to cover at a slightly worse price for a tiny loss.
- Otherwise, decide whether to hold one side as an ordinary bet.
Set your rule for this before it happens, not in the moment.
Is arbitrage betting legal and taxed in Australia?
9. Is it legal? Overseas answers often hedge here. In Australia, adults can legally bet with licensed bookmakers. Backing different outcomes at different bookmakers is simply placing ordinary bets.
The key is that every bookmaker you use is licensed. The Australian Communications and Media Authority runs a page where you can check whether a gambling operator is legally allowed to offer services to Australians. Use it before opening any account.
10. Do I pay tax on lock returns? The Australian Taxation Office's guidance on gambling winnings explains that winnings generally aren't assessable income for people who bet as a pastime.
ATO Taxation Ruling IT 2655 looks at when betting activity could amount to carrying on a business, which is treated differently. Your own circumstances matter. If you bet at volume or in an organised, business-like way, get advice from a registered tax agent rather than relying on a forum post.
11. Which bookmakers can I use? Only licensed Australian bookmakers. Skip any operator that doesn't pass the ACMA check, including offshore sites advertised in comment threads. Those sites put your deposits, your identity documents and your legal position at risk.
A quick pre-account checklist:
- Confirm the operator using the ACMA tool.
- Read the terms on voided bets, dead heats and obvious price errors.
- Check deposit and withdrawal methods and how long they take.
- Verify your ID early so a withdrawal isn't held up later.
What do arbitrage betting Quora answers leave out?
12. Will bookmakers limit my account? It's a real possibility. Bookmakers can restrict the stakes they accept from any customer, and arbers who consistently take the best price are often affected.
Plan for it. A limited account doesn't end your arbing, but it does reduce how many locks you can cover. Spreading activity across several licensed bookmakers helps.
13. Can a bet be voided after I place it? Yes. Bookmaker terms commonly allow a bet to be voided if:
- the price was obviously wrong
- the event is abandoned
- the event changes in a way the terms cover
If one leg is voided and the other stands, you are left with an ordinary single bet. That's why an unusually large percentage is a warning sign rather than an opportunity.
14. What mistakes cost new arbers most?
- Backing the wrong outcome or the wrong market, such as line instead of head-to-head
- Missing the draw in a three-way market
- Typing $2,469 instead of $246.91
- Forgetting that settlement rules differ between bookmakers
- Leaving a leg unplaced because a website was slow
A simple routine helps:
- Read the event, market and price aloud before you confirm.
- Screenshot each bet slip.
- Log both legs before moving on.
Errors are one of the biggest drags on real-world returns, and they are within your control. Slow down on your first few dozen locks. Speed comes with practice, and accuracy is worth more than the occasional missed lock.
Can Australians arb in-play or on overseas sites?
15. Can I arb in-play, or use overseas exchanges and apps? Many answers on international Q&A sites assume you can bet live online or use offshore exchanges and prediction markets.
Online in-play sports betting isn't offered to Australians, so the locks here are pre-match. Offshore sites aren't an option either, for the reasons covered above. If a strategy depends on live online betting or an unlicensed site, it doesn't work for Australian readers.
What works locally:
- Pre-match head-to-head and line markets across licensed bookmakers
- Racing markets where fixed prices differ between bookmakers
- Alerts that show the stake for each outcome, so you aren't calculating under time pressure
That last point is where AUOdds fits. It flags locks across Australian bookmakers with the exact stake for each outcome, and you decide whether to place the bets yourself.
Keep it in proportion. Arbing still involves real money, real bookmaker accounts and real mistakes. Treat it as a numbers exercise with a set budget, never as a way to recover losses.
You must be 18 or over to bet. If betting stops feeling like a choice, help is available:
- BetStop, the National Self-Exclusion Register, lets you exclude yourself from licensed online and phone wagering providers.
- Gambling Help Online offers free, confidential support at any hour.
- The Department of Social Services publishes further information on gambling support.
Frequently asked questions
Is arbitrage betting explained simply just betting on both sides?
Partly. You back every possible outcome, but each at a different bookmaker offering the best price. A lock exists only when the implied percentages of all outcomes add up to less than 100%. Backing both sides at one bookmaker always costs you its margin. Spreading the outcomes across bookmakers is what can create a small return at the prices shown.
How much money do I need to start?
There's no fixed amount. Because typical locks are only around 1% to 2%, small outlays produce small dollar returns. You also need funds sitting in several bookmaker accounts at once so you can cover each leg quickly. Start with an amount you can comfortably afford to have tied up, and grow it only after you've logged a good run of accurate bets.
Are Quora answers about arbitrage betting reliable for Australians?
Often not. Many come from overseas punters who assume online in-play betting, offshore exchanges or local tax rules that don't apply here. Few cite any source. For Australian questions, check operator legality with the ACMA, tax with the Australian Taxation Office, and support options through BetStop and the Department of Social Services rather than relying on forum opinions.
Does arb betting stop working once I'm limited?
Not entirely, but it gets harder. A limited account accepts smaller stakes, which shrinks the locks you can cover with that bookmaker. Holding accounts with several licensed Australian bookmakers spreads your activity and keeps more options open. Treat limits as a normal part of arbing and plan your bankroll and expectations around them from the start.
Sources
- Check if a gambling operator is legal, Australian Communications and Media Authority
- Crypto asset prizes and gambling winnings, Australian Taxation Office
- Taxation Ruling IT 2655: gambling and betting winnings, Australian Taxation Office
- BetStop, Australian Government
- BetStop: the National Self-Exclusion Register, Australian Communications and Media Authority
- Gambling, Department of Social Services
More guides
18+ only. Betting involves risk, and prices and limits can change before you place a bet. If gambling isn't fun any more, Gambling Help Online (1800 858 858) is free and confidential, and BetStop lets you exclude yourself from every licensed Australian bookmaker.