Arbitrage Betting in New Zealand

Updated October 2026

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A sure bet, in the abstract, is a tidy trick. Two bookmakers disagree on the same event. Their prices are far enough apart that, no matter who wins, the bettor ends up ahead. The textbook version of the trade is clean: a calculation, two clicks, a small profit. Then the picture comes up against New Zealand’s gambling law, and almost every assumption underneath it breaks.

Updated 31 October 2026 against the Racing Industry Act 2020 as it now stands, the Department of Internal Affairs’s public position, and the operators’ own pages.

What arbitrage betting actually is

An arbitrage opportunity exists when the odds cover all mutually exclusive outcomes of an event and their implied probabilities add up to less than 1. That gap, tiny as it tends to be, is what the bettor is reaching for.

The arithmetic is the part every guide writes down first, so it sits here too. Take a two-way market priced at 1.90 / 1.90. Each side carries an implied probability of 1 ÷ 1.90 ≈ 0.5263, and the two together sum to about 1.0526. That is the bookmaker’s overround sitting inside the two prices. The margin, or the slice the house keeps from every unit bet, is calculated as 1 minus the payout percentage. With a payout of about 95%, the margin is 5.0%. The wider the margin, the smaller the slice the bettor keeps of the total pool.

A “true” arbitrage, in the technical sense, has no margin at all — the implied probabilities sum to 1.00 exactly, and the bettor covers all outcomes for the same money back. That is also the case the technique was named for.

The honest version of how this happens is duller than the marketing copy suggests. Bookmakers don’t price events in a room together; each firm sets its own line from its own models, its own liabilities, and what its competitors have done. When two firms disagree, the difference is a mispricing on one side, on both, or in the gap between them. A punter who spots it can place a back bet at one firm and a lay-equivalent stake at the other, locking in a return regardless of the outcome. The literature calls the workable cases “near-arbitrage” because the sum rarely lands at exactly 1.00 — usually at 1.01 or 1.02, and usually for a short window before one firm moves.

The numbers the marketing tends to leave out

A 2012 study by Franck, Verbeek and Nuesch looked at a large set of captured arbitrage opportunities and found that 98% of them returned less than 1.2%. That is not 1.2% per event on a small stake — it is 1.2% of capital, on sums large enough to make that 1.2% worth chasing. The technique only pays in volume. A punter chasing 1% returns needs turnover in the tens of thousands before the daily earnings become anything close to a wage, and turnover that size is precisely what an arbitrage player places — and what a bookmaker notices.

Bookmakers are watching

Firms detect arbitrage quickly and view it unfavourably. The standard response is a sharp drop in maximum wager limits on the offending account, sometimes within hours of a flagged trade. In older cases, as described in the literature, the firm cancelled one half of the bet after the event or shut the account outright. The detection is not subtle: pro arbers stake the same event at multiple firms within minutes, often with mathematically precise stakes, and the trade sizes are inconsistent with a casual punter.

A reader running the technique for the first time can expect a short working life on any one account. The 1.2% per round, compounded across many rounds, only beats the bookmaker’s clawback if the bookmaker stays out of the way. The bookmaker’s side of the trade is to make sure that doesn’t happen.

How the trade is built: selection, stake, settling

A working trade has three parts.

Selection is the first. The bettor needs two or more firms pricing the same market, and one firm’s price has to be far enough off the others for the gap to exceed the firms’ combined margin. The textbook example uses a tennis match at firm A and firm B, where firm A has player one at 2.10 and firm B has player two at 2.10. The implied probabilities sum to about 0.952, well below 1, and the gap is the trade.

Staking is the part that needs the calculator. The bettor divides the intended total stake across the outcomes so that, after the winning selection pays out, the return covers the losing stake and leaves the planned profit. Where the odds are symmetric — 2.10 / 2.10 — each side gets half the stake. Where they aren’t, the proportions shift in the obvious direction: heavier stake goes on the shorter-priced side, since the smaller payout still has to clear the larger losing stake on the other side.

Settling is the part that decides whether the trade was real. One of the bets wins, one loses, and the payout on the winning side pays both stakes and leaves the gap behind. The bettor’s actual profit is the difference between what the winner paid and the total of the two stakes. On a symmetric 2.10 / 2.10 with $100 on each side, the winning bet returns $210; the loser is gone; the punter keeps $210 and has risked $200, for a net $10.

Two practical points the arithmetic does not telegraph. First, the proportions depend on both prices, not on the event: a trade at 1.95 / 2.20 has its own split, and a calculator is the fastest way to land on it. Second, every firm charges its own margin inside its own price, so the trade’s edge has to clear both margins and still leave something. Most opportunities that survive the price check are tight.

What the calculation does not say

A “how to” guide that ends with the calculation has described how the trade works at the moment the prices sit on screen. Three things happen next, and none of them is in the formula.

The price moves. By the time the second stake is placed, the first firm’s price has often been pulled. The bettor ends up holding a position that no longer sums to less than 1, and the edge is gone. Speed matters more than the formula does.

The bet settles with one leg short. Either firm voids the selection, suspends the market, or the rules disqualify the result. The bettor has unmatched exposure on one side, and the other leg doesn’t cover it. Even a “settlement concern” — a regulation-time tweak, a walkover ruling — is enough to push the trade from locked-in to lopsided.

One firm doesn’t pay out. Offshore firms operating outside New Zealand do not sit inside the New Zealand complaints framework. The Department of Internal Affairs has publicly warned that offshore operators may be in jurisdictions with minimal consumer safeguards, may not return unspent credits and may not pay out large wins. A bet that “wins” is only a paid bet if the firm settles it.

How to arbitrage bet, in steps the trade actually has

The shape of a working trade, stripped of the marketing tone, runs roughly like this.

Find an event. Most arbers work from soccer, tennis, basketball — sports with deep liquidity and frequent price disagreement. Lower-liquidity markets are wider but slower to settle and easier for the firm to walk back.

Find the disagreement. The bettor needs at least two firms offering all outcomes, with the implied probabilities summing to under 1. The harder part is finding it before either firm moves; the alerts from an odds-scanning tool chase the same signals many other arbers are watching.

Place the first stake. Heavier stake on the shorter-priced side (lower payout, more likely to win), lighter on the longer-priced side. The split targets equal profit regardless of outcome, not equal stake.

Place the second stake immediately. Once the first leg is in, the second has to be locked in fast — every minute is a minute the price can move.

Wait. One of the bets will win. One of them won’t. The arithmetic accounts for both.

The “system” people sell as a course usually isn’t a system. It is the trade, plus a subscription to an odds scanner, plus the discipline to run it across many events a day. The labour cost is the part the guides leave out.

The prediction and analytics trade

The phrase “arbitrage betting tips today” appears in search data because the technique reads like a prediction market — two prices that disagree, a calculated winner. It isn’t one. The bettor is not forecasting who wins. They are betting both sides on a market that, on paper, pays the same regardless. The “prediction” is not who wins but where the mispricing sits.

Statistical arbitrage sports betting is the more honest name for the same trade: a quantitative technique in which the bettor identifies pricing inefficiencies across firms and exploits them through volume, not through any view on the result. The trading floor analogy is closer than the punter analogy. The 2012 study is the literature on which the field rests; it found an edge that is real, thin, and broad.

Where prediction and arbitrage do blur is in the role of information. A bettor who knows the favourite is injured sows a different market than one who doesn’t, and the early adjuster captures a brief arbitrage window before the rest of the market catches up. That edge is short-lived and reputational in a way the pure arbitrage isn’t. A pure arbitrage trade runs whether the bettor has any view on the event or not.

Top-10 operators that turn up when New Zealand players search for the trade

The list below is what a New Zealand player meets in the wild, ordered by what New Zealand law actually permits, not by any claim the firms make. Two providers sit at the top: TAB and Betcha, both of them online brands of the same operator. The other eight are offshore; in New Zealand, only TAB NZ may take a racing or sports bet, and the offshore brands are not lawful here.

TAB and Betcha are the same operator group. The next six brands in the list all say in their own terms where they sit, and the rest are offshore operators with no New Zealand licence. A reader comparing the alternatives needs to see them all in the same frame — the two lawful brands first, the rest for context, each one marked exactly as the law sees it.

TAB — the only lawful full-service bookmaker in New Zealand

TAB is one of the two online brands of TAB NZ, and since 28 June 2025 it has been the only provider lawfully offering racing and sports betting to people in New Zealand. The Racing Industry Act 2020, at section 74AAA, makes the position statutory; there is no licensing route for another bookmaker, because there is only one lawful provider to license. New Zealand players comparing options do not have a second lawful sportsbook against which to weigh TAB — they have one lawful operator and a long list of offshore brands that the Department of Internal Affairs has told to withdraw from the New Zealand market.

The practical advantage of that position is regulator oversight. TAB’s terms, its safer-gambling tools and its complaints process all sit inside New Zealand law. The TAB app — first released on 8 September 2014 and published under the seller name New Zealand Racing Board — lists deposit limits, time-outs and self-exclusion in its product, along with the free Gambling Helpline number 0800 654 655 and the text line 8006.

The constraint is the size of the book. Two firms need to disagree before an arbitrage trade exists, and TAB is one firm. A pure arbitrage trade inside the lawful market is structurally impossible against a single bookmaker. The 2012 figure on near-arbitrage returns assumes a fragmented market; the New Zealand market has, since 28 June 2025, one sportsbook with racing and one without. Anything labelled an “arbitrage opportunity” inside New Zealand is either pricing lag on a single event (a firm moving a single market) or trading against an offshore brand.

A New Zealand reader who wants the regulator’s protection takes TAB. A reader who wants the chance at an arbitrage trade is, by law, looking outside the framework the regulator enforces.

Betcha — the second lawful brand, run by the same operator

Betcha is the second lawful online brand and the digital-native face of TAB NZ, sitting next to TAB in the same operator group. The platform is built around engagement features that TAB’s main product does not lean on as much: a daily Toolbox with odds boosts and insurance on bets that miss, a Playbook with match analysis and tips, and a Bet Social section where punters chat, follow tipsters and share bets.

For arbitrage purposes, Betcha is the same operator as TAB. Two accounts at the same operator are two screens into one bookmaker’s liabilities, not a price disagreement. The firms do not disagree with themselves, so no arbitrage opportunity sits inside the pair. The “two-bookmaker arbitrage” structure that the technique needs cannot be assembled from one operator.

The honest read for a reader considering Betcha is that the platform is designed for engagement — odds boosts, tipster followings, social betting — and not for the kind of quantitative cross-firm trading the arbitrage field assumes. A punter looking for the social product and the regulator’s framework finds them both in Betcha. A punter looking for a working arbitrage trade finds neither.

Glorion — offshore, no New Zealand protection

Glorion is an offshore operator with no licence that applies in New Zealand. The brand’s own page states it accepts customers 18 years and over, with support reachable by Live Chat or email. There is no entry on the Department of Internal Affairs’s roster for New Zealand betting, no local complaints route, no entry in New Zealand’s harm-minimisation framework. A New Zealand player who runs into a payout dispute does so against a firm that the regulator has already told to withdraw from the country.

The firm is one of the offshore brands many New Zealand players meet in search results and on affiliate pages. The honest framing for the reader is that the offshore position is fixed: the firm is not lawful in New Zealand, the regulator has told it to stop, and a player using it is doing so outside the regulator’s protection. The Department of Internal Affairs’s stated position is that offshore operators may not return unspent credits and may not pay out large wins — a useful read for any reader weighing the trade.

A New Zealand reader who picks Glorion gets the offshore product menu and accepts the offshore risk profile, and accepts that arbitrage work across firms requires the offshore side of the price to be one of the prices worked into the trade.

BillyBets — offshore, multiple odds formats

BillyBets is another offshore brand with no New Zealand licence. The bookmaker offers three odds formats on the same account — decimal at a sample 2.00, American at +100, and fractional at 1/1 — and runs a cashback and reload structure on sports, a coin shop in which coins earned from depositing, betting and tournament play convert to free bets and free spins, and a five-tier VIP programme. None of those features changes the position on the trade. The bookmaker sits outside the New Zealand framework, the regulator has told it to stop taking New Zealand bets, and any payout dispute is going to run in the firm’s home jurisdiction rather than the punter’s.

The feature that bears mentioning is the odds-format switch. New Zealand punters read prices in decimal ($2.10), so the format toggle is essentially native rather than something a reader has to learn. A punter using the platform in decimal form does not lose anything to the format conversion, but does lose the New Zealand regulator’s protection on either side of the trade.

Roobet — Curaçao-licensed, no New Zealand reach

Roobet is a Curaçao-licensed operator run by Raw Entertainment B.V. under licence OGL/2024/687/0427. The Curaçao licence does not extend to taking bets from people in New Zealand. The Department of Internal Affairs’s public position is that an offshore operator taking sports or racing bets from a person in New Zealand is breaking New Zealand law, and the regulator has told such providers to withdraw with immediate effect. The section 74AAA position is the same for every Curaçao-licensed brand on the list.

Roobet’s distinctive feature is its crypto-first account model, which the name gives away: deposits, play and withdrawals are denominated in cryptocurrency, and the casino is the louder product. A reader who wants a crypto-denominated offshore sportsbook understands the access cost up front — no New Zealand protection, no New Zealand complaints path, no regulator’s framework on either side of the trade.

22Bet — Curaçao-licensed, no New Zealand reach

22Bet is another Curaçao-licensed offshore brand run under TechSolutions Group N.V. on a Curaçao 8048/JAZ licence. The licence does not extend to taking bets from people in New Zealand. The platform offers single bets, accumulators, systems and chains, with live betting and real-time odds and score updates on the in-play product. The product depth is high; the New Zealand protection is none.

For arbitrage work, the brand is one of the deeper offshore books, and the kind of price disagreement between 22Bet and another offshore brand is the typical pattern of a working trade — except that the “trade” happens between two operators neither of which is permitted to take a New Zealand bet. A New Zealand player reading this section needs to hold two ideas at once: the offshore bookmaker is large and well-stocked, and it is not lawful for it to serve a New Zealand punter.

Rabona — Curaçao-licensed, part of a multi-brand group

Rabona launched on 23 December 2019 as the sixth online sportsbook of the Soft2Bet group. The Curaçao licence gives it no right to take New Zealand bets. The Sportsbook runs across the brands in the group, with the same product surface in slightly different skins. A New Zealand reader using one of these brands meets the same operator-group architecture across several entries, and the offshore risk profile is identical.

The feature worth naming is the operational pattern: a single operator group running multiple brand skins with shared product infrastructure. From a regulator’s view in New Zealand, the multiple brands do not enlarge the lawful market. From a punter’s view, the multiple brands give the arbitrage technique the price disagreement it needs to work — except that the technique, in New Zealand, is bookended by firms that are not lawful to use.

Golden Panda — offshore with full sportsbook terms

Golden Panda publishes a dedicated Sports Terms and Conditions page covering fixed-odds betting, Combo Bets, a Bet Builder feature, live scoreboards and broadcasts, and stake and odds limits. The structure looks thorough, and from the outside the product is hard to fault. It is also still an offshore bookmaker with no licence that applies in New Zealand, which means the structure the page works hard to describe runs outside the regulator’s protection on either side of the trade.

The page is useful as a reference for what a working offshore bookmaker’s terms look like, and a New Zealand reader can read it the way an architectural blueprint is read: as a description of the structure, not as a permission to occupy it.

BetNinja — Comoros-licensed, no New Zealand reach

BetNinja names a licence from the Union of the Comoros, which gives no right to take New Zealand bets. The licence is one of several small-jurisdiction authorisations used by offshore operators; from a New Zealand reader’s standpoint it functions the same as the Curaçao licences on the rest of the list, which is to say, not at all. The brand sits outside the regulator’s framework, the regulator has told it to withdraw, and a New Zealand payout dispute runs in the firm’s home jurisdiction.

FunBet — offshore with a 24/7 bookmaker advertised

FunBet is an offshore bookmaker whose sportsbook lists football, ice hockey, American football, basketball, volleyball, tennis, rugby and baseball, with live betting and a bookmaker described as open 24/7. No New Zealand licence applies. The product range is wide, and the offshore risk profile is the same as the rest of the list. A New Zealand punter using FunBet is using an offshore brand outside the regulator’s protection, and an arbitrage trade that involves it is a trade between two firms neither of which is permitted to take the New Zealand end of the bet.

Whether the trade works in New Zealand, as a matter of law

The honest read is that it doesn’t — not within New Zealand, and not as a long-running technique even with offshore books.

The arithmetic works on paper. The Trading-floor analogy holds. The 2012 study confirms the technique has an edge, even a thin one. The mechanism exists in every market with two or more firms pricing the same event.

The law shapes what a New Zealand reader can actually run. Two firms need to disagree on price, and the only lawful options disagree with themselves — there is no arbitrage in one bookmaker. The offshore side does have the disagreement the technique needs, but each offshore firm is breaking New Zealand law in taking the bet, and the section 74AAA position is uniform across the offshore list. The Department’s public stance has been to tell offshore providers to withdraw with immediate effect, and the regulator’s own warnings on unpaid withdrawals sit there for any reader weighing the trade.

What that means in practice is straightforward. A New Zealand punter running the technique is running it against firms that are not permitted to take the bet. The bookmaker’s clawback is still there: account limits, voided selections, account closure. The regulator’s clawback is now layered on top of it: an offshore bookmaker that the regulator has told to stop. The reader is taking the bettor’s side of the trade against a counterparty that does not want it, and the trade has more than one direction of risk to clear.

There is a second, quieter point. Greyhound racing is closing in stages from 1 August 2026, and from that date offshore operators may not take bets on greyhound races either. The list of markets where the offshore bookmaker can take a New Zealand bet is shrinking on a published schedule.

Where the law actually sits

The Racing Industry Act 2020 set the position; the Racing Industry Amendment Act 2025 codified it. Section 74AAA, in force from 28 June 2025, says no person other than TAB NZ may offer racing betting, sports betting or other racing or sports betting to a person in New Zealand, regardless of where that person is resident or incorporated. The Department of Internal Affairs monitors the rule.

TAB NZ holds the statutory position, and Entain runs the TAB business under a 25-year agreement signed in 2023. The partnership gives Entain a 50/50 share of gross profits, with at least $150 million a year flowing to TAB NZ for the first five years, and Entain pledged a one-off $100 million payment to the racing sector on signing. The partnership is the operating layer on top of the monopoly; it does not change who lawfully takes the bet.

TAB and Betcha are the only two online brands within that arrangement. The Department of Internal Affairs has told providers serving New Zealand to withdraw with immediate effect. The Online Casino Gambling Act 2026 licenses online casino gambling only and does not extend the betting monopoly — so TAB New Zealand winning the right to apply for a casino licence does not give any other brand a sports-betting licence, and the betting prohibition and the casino permission are separate regimes.

On the player

The same statute has a carve-out. Section 19(4) of the Gambling Act 2003, inserted in 2025, says an individual may not be convicted for placing a bet with an offshore betting operator in breach of section 74AAA. The law targets the operator. No published penalty for a player sits in the statute.

That is the legal shape — neither criminalising the player nor legalising the bet. A New Zealand punter who bets with an offshore brand sits outside the New Zealand framework but does not stand inside a criminal conviction for the act of betting. Offshore operators face the regulator’s enforcement direction; the punter faces the firm’s house rules and the firm’s own behaviour on payouts and limits.

On integrity and limits

A single-firm market raises its own integrity questions. The Department of Internal Affairs framework, the Advertising Standards Authority’s Gambling Advertising Code, the harm-minimisation duties under the Racing Industry Act and the Problem Gambling Levy at 0.74% sit over the lawful bookmaker. None of those frameworks reaches an offshore firm. The offshore firm runs on its own house rules and the limits its own licence jurisdiction defines.

The reputable, regulator-tested product is the TAB NZ product, with deposit limits, time-outs and self-exclusion on the app, and the Gambling Helpline (0800 654 655) and the text line 8006 listed in-app. The offshore product offers whatever the firm publishes; the regulator’s framework is not part of the package.

Help, and what it costs to make use of it

The Gambling Helpline (0800 654 655) and the text service at 8006 are free, confidential, and New Zealand-based. Safer Gambling Aotearoa is the harm-minimisation service that the levy funds. Both sit alongside TAB NZ’s self-exclusion and deposit limits as the New Zealand framework for gambling harm.

The terms TAB NZ lists in-app are the regulator-tested safer-gambling tools. Deposit limits cap what moves into the account. Time-outs pause the account for a chosen window. Self-exclusion closes the account and bars re-opening for the exclusion period. The exclusion applies across both TAB and Betcha. Other operators do not participate in this framework, and an account at an offshore firm has no cross-firm exclusion mechanism against the New Zealand framework.

The point that matters for arbitrage work is that harm minimisation is not optional inside the New Zealand framework. TAB’s app makes these tools available because the law requires the firm to keep the risks of problem and underage gambling minimised. The 0.74% Problem Gambling Levy funds the rest of the framework. An offshore firm doing the equivalent trade has none of that scaffolding around it.

The free helpline and the text line are the parts a reader will write down before anything else on this page.

Crypto as a payment rail, and what it does not change

Crypto comes into arbitrage discussions because it fits the technique’s character: cross-firm, fast-moving, jurisdictionally light. A crypto wallet does not need a New Zealand bank account, and the funds can move between platforms without the cheque-clearing latency a bank transfer imposes. None of that turns the trade lawful in New Zealand, and none of it changes who the regulator has told to stop.

The right framing is that crypto is a payment rail and not a legal position. The Offshore operator’s section 74AAA breach happens the same way whether the punter paid in crypto or by card. The Department of Internal Affairs’s standing warning covers both. A crypto wallet’s pseudonymity is a different feature with a different design: confidentiality from counterparties, not exemption from a regulator. The New Zealand framework does not grant the punter any legal cover for using crypto at an offshore bookmaker, and using crypto at TAB NZ is also unsupported because TAB NZ’s deposit methods are operator-level and not part of the statute.

The 2018-equivalent literature on crypto-arbitrage covers the trading-floor case — across exchanges or against bookmakers — and the same edge-and-volume calculus applies. The technique is real, returns are thin, and turnover is large. The New Zealand legal position is independent of the payment rail, and the technique’s lawfulness under section 74AAA depends only on the operator.

How the maths sits against the legal frame

A practical reader works through a single trade to see what it actually pays. Symmetric 2.10 / 2.10 odds on a tennis match, $100 on each side, the winning bet returns $210, the loser is gone, and the punter keeps $210 against $200 risked. Net profit is $10 on $200 — the 1.2% range from the 2012 study sits across similar trades. Take the same trade with a wider margin on one side — say 1.95 / 2.20 — and the implied probabilities sum to about 1.0274, leaving the trade near or below break-even before the bookmaker’s clawback runs.

The work the bettor actually does, on a working trade, has two halves. The first half is the calculation: stake split to clear the winning bet with both stakes returned plus the planned profit. The second half is everything else — the price moving before the second leg lands, the rule-tweaks at settlement, the firm’s clawback in the weeks after, and the offshore firm’s response when the regulator tells it to stop. A punter who understands only the first half is reading the trade’s pricing without its risk; the second half is where the profit is contested.

The wider lesson is that the literature on the technique is accurate as a description of how the trade works, and the regulator’s framework is accurate as a description of where it can be lawfully run. Neither contradicts the other; they sit on different axes. The trade’s edge is real in any fragmented market. The New Zealand market is not fragmented — it is one firm with two brands and a long list of offshore firms that the regulator has told to stop.

Picking the right path

A reader comparing options has three honest choices.

The TAB NZ path is the lawful path. It is the only one with regulator oversight, the New Zealand safer-gambling tools, the harm-minimisation framework, and the complaints process. A reader who picks TAB NZ is also picking against arbitrage: a single-bookmaker market does not give the technique the disagreement it needs. The pick is a wager that the regulator’s protection is worth giving up the trade’s edge.

The offshore path is the trade’s path, in the literature’s sense. Two or more offshore firms disagree on price, the bettor covers the outcomes, the arithmetic closes. The path comes with the book’s clawback (limits, voids, account closure), the regulator’s public position (DIA’s instruction to withdraw), the financial warning (offshore firms may not pay large wins) and no New Zealand complaints framework. A reader who picks this path is also picking outside the regulator’s protection.

The hybrid path is the one that, on paper, makes the trade viable. The bettor uses TAB NZ for one leg and an offshore firm for the other. The arbitrage technique requires disagreement between firms — and a single-bookmaker market at one end gives no clean disagreement, while an offshore firm at the other is breaking New Zealand law in taking the bet. The hybrid gives neither side the position it claims. Section 74AAA makes the offshore leg unlawful; the trade’s structure makes the TAB leg uninteresting as an arbitrage side.

Each path has a cost the marketing copy omits. The TAB path costs the trade’s edge. The offshore path costs the regulator’s protection. The hybrid costs both, with the offshore leg’s lawlessness compounded by the section 74AAA breach the offshore firm is committing on the player’s behalf. A reader weighing the three can weigh all three costs, on the same scale.

Frequently Asked Questions

Does sports arbitrage betting work?

Sports arbitrage betting works in the arithmetic sense: the trade has a positive expected value any time two or more firms disagree on the same market by more than their combined margin. In practice, 98% of the opportunities found in the 2012 study returned less than 1.2% — meaning the technique relies on very large turnover to be worth the labour. Bookmakers detect the pattern quickly and respond with sharp drops in stake limits, voided bets or account closure.

How to arbitrage bet?

The shape is straightforward: find an event priced at multiple firms, identify an outcome set whose implied probabilities sum to below 1, divide the intended total stake across the outcomes so the winning side pays for both stakes and a planned profit, and place all bets within the same window before any firm moves. The labour sits in finding the opportunity in time and staking the proportions correctly.

How is the return on a bet worked out from the stake and the odds?

A winning single bet returns stake × odds, where the odds are decimal. Net profit is stake × (odds − 1). A 100 NZD bet at 2.10 returns 210 NZD: 100 NZD of stake returned plus 110 NZD of profit. A combination bet’s payout multiplies the legs’ odds together, so a two-leg multi at 1.80 × 2.20 returns stake × 3.96.

Which bookmaker may lawfully take sports and racing bets in New Zealand?

Since 28 June 2025, when the Racing Industry Amendment Act 2025 inserted section 74AAA into the Racing Industry Act 2020, TAB NZ and its online sister brand Betcha are the only operators allowed to take online sports and racing bets in New Zealand. There is no licensing route for another bookmaker and no separate licence register for bookmakers, because there is only one lawful provider. The Department of Internal Affairs told unlicensed providers to withdraw with immediate effect.

What is the bookmaker’s margin and how can it be seen in the odds?

The margin is what the bookmaker keeps of every unit bet on a market, after the bets are settled. It shows up in the sum of the implied probabilities of all outcomes: implied probability is 1 ÷ decimal odds, and the overround of a two-way market is the sum of the two implied probabilities minus 1. A two-way market priced at 1.90 / 1.90 has implied probabilities of about 0.5263 each, summing to about 1.0526 — an overround of roughly 5.26%, which corresponds to a margin of 5.0% and a payout share of about 95%. A “true” arbitrage has a margin of exactly 0%.

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