Arbitrage betting in New Zealand: what the numbers say and who is allowed to take the bet

Updated October 2026

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Data current as of 30 October 2026, checked against the Department of Internal Affairs register and TAB NZ’s own published terms.

Arbitrage betting is the practice of placing one bet on each possible outcome of an event at different bookmakers and locking in a small return whatever the result. The arithmetic is real, and it is the same arithmetic the bookmaker uses when pricing any market. The 2012 study most often cited — Franck, Verbeek and Nüesch — found that 98% of arbitrage opportunities return less than 1.2% on the total stake, which is why the technique asks for a bankroll measured in the tens of thousands of dollars to produce an income a working person might notice. In New Zealand the question is not whether the maths is true. The question is whether a punter might lawfully run it. Since 28 June 2025, section 74AAA of the Racing Industry Act 2020 makes TAB NZ the only operator allowed to take online sports and racing bets from people in New Zealand, and an arbitrage strategy that needs several bookmakers cannot be run inside that monopoly. This page walks through the strategy, the maths and the market as it actually sits for a New Zealand reader in 2026.

The strategy and what it asks of a bankroll

What an arbitrage opportunity is, in one sentence

An arbitrage opportunity exists when the odds a punter can lay on each mutually exclusive outcome of an event — say each runner in a two-horse race, or each side in a head-to-head market — imply probabilities that add up to less than one. Sum them across every bookmaker, compare the totals, and where the implied probabilities fall short of 100% the gap is the punter’s edge before any stake is placed. The wider the gap, the more the strategy pays on turnover.

Most of the time, that gap is narrow. The Franck, Verbeek and Nüesch study sampled real opportunities across a long window and found that 98% of them returned less than 1.2% on total stakes. Translate that to a working day: a punter staking $10,000 across an arb at that typical margin might clear $120 before commission and before any cost of placing the bet. Run ten of those in a day and the gross is $1,200 — a number that sounds meaningful until it is set against the bankroll needed to back both sides, the time spent finding the bet, and the speed at which bookmakers close the door on a customer who does this for a living.

The three ingredients an arb needs

An arbitrage bet only exists where three things come together at the same moment. The bookmakers on both sides must each have priced the market. The prices must disagree by enough that the implied probabilities sum to less than one. And the punter must be able to place both bets before either bookmaker moves its line. The third ingredient is the one that quietly does most of the work, and it is the one that no software can guarantee on a person’s behalf.

The first two ingredients can be checked by a calculator in a second. A two-outcome market at decimal odds 1.90 and 1.90 sums implied probabilities of 0.526 plus 0.526, which is 1.053, or 105.3%. That market is overround by 5.3% and there is no arb. Move one side to 2.05: implied probability 0.488, sum 0.488 plus 0.526 equals 1.014, or 101.4%. Still no arb. Push the longer side to 2.15: implied probability 0.465, sum 0.465 plus 0.526 equals 0.991, or 99.1%. That is an arb, and the gap is the punter’s edge before stakes are weighted to the right ratio. Most live arbs in soft markets sit at margins this thin, and many close out before both bets are confirmed.

Stakes are split, not matched

A naïve bettor stakes the same amount on each side, which is the most expensive mistake an arb can produce. The right move is to weight each stake so the payout is the same whichever outcome lands. Take a tennis match where back odds are 2.10 and lay odds are 1.85, and the total stake is $1,000. The book is 1/2.10 + 1/1.85, which is 0.476 plus 0.541, summing to 1.017. The payout share is the reciprocal: 0.983. Edge before stakes is 1.7%. To balance a $1,000 stake, the side at 2.10 takes $483 and the side at 1.85 takes $517. If the favourite wins the back side returns $1,014; if the outsider wins the lay side returns $957. Either way the loss is small. A flat $500 / $500 might have produced $1,050 on the favourite and $925 on the outsider — a wider swing, more money at risk, same edge.

Why the bankroll has to be large

Take a typical arb with a 1% edge on the total stake. The punter must hold enough capital to back both sides in full and to keep doing so while a bookmaker reviews the account. A punter clearing $200 a day on a 1% edge must turn over $20,000 in stakes, which means holding roughly $20,000 free in two separate accounts. Set that against the time spent sourcing the bets, the chance of one bookmaker voiding or suspending before the bet settles, and the chance of the account being closed at the end of the month. The strategy pays, when it pays, on scale. Below that scale it is a hobby that costs more in subscription fees to the odds-scanning service than it returns in cleared profit.

The bookmaker’s side of the trade

Bookmakers price a market by building in a margin, and the same maths that gives the punter an edge when the margin is mispriced is the maths that gives the bookmaker its edge when it isn’t. The bookmaker sees the same prices the punter sees and can reprice within seconds. A bookmaker that finds itself on the wrong side of an arb will pull the market, cut the maximum stake on the affected selection, or restrict the account once the pattern is clear. The 2012 study’s 98% figure tells one story; the other story is that the remaining 2% of opportunities is where the bigger edges sit, and those are precisely the bets that draw the fastest response. A punter who has built a position on the longer-odds side at 2.15 will not be welcome at that bookmaker for long.

What “live arbitrage” adds on top

Live arbitrage — placing each leg of the arb while the event is in play — adds the time pressure to the stake problem. In-running odds move with every rally, every goal, every boundary, and the window between finding a misprice and getting both bets on can collapse in a single tick of the price feed. A punter doing this in a sport they don’t watch will lose money on missed bets; a punter doing it in a sport they do will spend more hours than the cleared edge justifies. In New Zealand, where only TAB NZ may lawfully take the bet, the live arbitrage market for a New Zealand-based punter is effectively single-bookmaker, and the strategy collapses at the source.

What kind of bet pays what, and how the odds describe it

A bet has three parts: selection, stake and odds

A bet is a contract. The punter names a selection, names a stake, and accepts the odds offered at the moment the bet is struck. The return on a winning single bet is the stake multiplied by the odds. A $50 bet at decimal odds 1.90 returns $95 — the original $50 back plus a $45 profit. Decimal odds already carry the stake, which is one reason New Zealand bookmakers, including TAB NZ, publish decimal prices as the default. The American and fractional formats offered by some offshore bookmakers are the same number rewritten; they do not change the payout.

For a combination bet — what TAB NZ calls a multi, and what most other bookmakers call an accumulator — the legs multiply into one price. A two-leg multi at 1.90 and 1.85 has combined odds of 3.52. A $50 stake returns $176 on the win. The bookmaker’s margin compounds with each leg, so a five-leg multi at 1.90 each has combined odds of 24.76 but a margin several times higher than a single match-result market. The punter is paid for taking more risk; the bookmaker is paid for selling a longer-shot product.

What a bookmaker’s margin actually is

The margin is the cut the bookmaker takes off every unit bet on a market. A two-way market at decimal odds 1.90 and 1.90 sums implied probabilities of 1.053. The bookmaker’s margin is 5.3% and the punter’s payout share is 94.7%. Push the prices to 2.00 and 2.00: implied probabilities sum to 1.000, the margin is zero, and the bookmaker is offering a fair market, which in practice it almost never does. At 1.85 and 1.95 the implied probabilities sum to about 1.054, a margin of 5.4%. The narrower the sum, the closer the bookmaker is to offering fair odds; the wider the sum, the more the bookmaker keeps.

The margin is invisible on a single bet slip. The bettor sees one price, accepts it, and has no need to know the other side of the market. The bookmaker keeps the cut across the whole market, not on any one bet, which is why a margin of 5% is consistent with a small win on a single bet — the punter won at price, the bookmaker won on margin. For an arbitrage bettor the margin is the entire reason the strategy works: the punter is harvesting the mispricing between bookmakers, and the bookmaker is the source of the mispricing in the first place.

How an arb finder turns a price into a stake

A typical arb finder takes three inputs: the back odds, the lay odds, and the total stake the punter is willing to risk. The arithmetic inside it is the same arithmetic a punter does by hand. The tool exists because the window is short and the maths is the same every time. A good arb finder will not find an arb the punter might not have found by reading two bookmaker sites side by side; it will only find the arb faster. In a market where prices move every second, faster is worth paying for — and a free tool is worth more than a paid one only if the paid one covers a bookmaker the free one does not.

A useful sanity check: an arb that the calculator reports as 5% on turnover will leave the punter about $50 ahead on a $1,000 stake. If the calculator reports 5% and the punter’s account is ahead $10, one of two things has happened. Either one leg of the bet was restricted, voided or settled differently to what the calculator assumed, or the prices moved between the calculator’s snapshot and the bet being struck. The tool cannot see the second event. The punter has to.

The ranking: ten bookmakers, two of which can take the bet

The two operators that may lawfully take an online sports or racing bet from a person in New Zealand are the two online brands of TAB NZ. Every other name on the list is a foreign operator that may not, by section 74AAA, take such a bet from a New Zealand resident. Each is described here on the same criteria, but a New Zealand reader is not the audience an offshore brand is built for, and the comparison below is reference, not endorsement.

The table is the page’s reference map. The detail on each operator follows, and the verdict at the foot of each block is the page’s own judgement of what the brand is worth to the reader in front of it.

TAB

TAB is one of two online brands of TAB New Zealand, the holder of the racing and sports betting monopoly in New Zealand under section 74AAA of the Racing Industry Act 2020. The retail network of TAB outlets across the country takes the same bets the website takes. The app, published on the New Zealand App Store under the seller name New Zealand Racing Board, has been live since September 2014 and lists the safer-gambling tools the law expects a New Zealand-licensed operator to carry: deposit limits, time-outs and self-exclusion. The free Gambling Helpline number and the text line are surfaced in the app for the moments a punter needs them.

For an arbitrage punter in New Zealand, TAB is half the book — the only half the law allows. An arb needs two bookmakers, and a single-counterparty market is not a market at all in the strategy’s terms. A New Zealand punter who is going to bet on the TAB platform alone is not running an arbitrage strategy; the punter is paying TAB’s margin on every bet and losing, on average, the share of turnover that the margin represents.

The verdict: TAB is the lawful option, and the only one. For a New Zealand reader it is the operator a bankroll flows through, and the safeguards around the account are the safeguards a New Zealand reader has any practical claim on. The price the punter pays is the monopoly margin and the absence of a second bookmaker to arb against.

Betcha

Betcha is the second of the two online brands of TAB New Zealand. The site carries the same racing and sports markets as TAB and runs the same internal compliance with section 74AAA. What it adds on top of the TAB brand is product surface: a daily Toolbox with odds boosts and insurance tools for bets that do not land, a Bet Social feed where punters chat and follow tipsters, and a Playbook section with tips and match analysis. None of that changes the monopoly. Betcha and TAB are not rivals; they are two shopfronts on one licence, run by TAB New Zealand.

The same single-bookmaker constraint applies. A punter who holds both a TAB account and a Betcha account and tries to arb between them is, in practice, betting the same bookmaker twice and watching the second bet get referred to a trader the moment the pattern becomes obvious. The strategy dies at the source.

The verdict: Betcha is the social, content-led face of the monopoly. The reader who likes a tipster feed and an odds boost will spend their time here. The reader who needs a second bookmaker for a multi-account strategy will find that the constraint of the licence is the constraint of the strategy, and no feature on the product changes it.

Glorion

Glorion is a Curaçao-based online casino and betting site with support available by live chat and email. The site accepts customers over 18. It does not name a licence that applies in New Zealand, and the New Zealand complaints framework and harm-minimisation tools of a New Zealand-licensed operator do not reach it. The Department of Internal Affairs has been clear since 28 June 2025 that offshore operators serving New Zealand are operating unlawfully under section 74AAA; the operator carries the risk, not the player, but the player is also not in the room where a complaint gets heard.

For a New Zealand reader the question is not whether the site pays out its winners in general. The question is whether the bet struck on a Glorion account is one the operator is allowed to take from a person in New Zealand, and the answer is no. The page is not the place to argue the case for the operator; the page is the place to be honest about the constraint.

The verdict: Glorion sits outside the New Zealand framework. A New Zealand reader has no regulator on the other end of the dispute and no harm-minimisation tooling built for a New Zealand audience. Worth a look only as a reference point for what an offshore bookmaker looks like in the market; not a counterparty for a New Zealand bankroll.

BillyBets

BillyBets publishes odds in three formats — decimal, American and fractional — which is useful for readers who think in one format and shop in another. The sports side of the site carries cashback and reload bonuses, a coin shop where coins earned through depositing, betting, tournaments and challenges can be swapped for free bets and free spins, and a five-level VIP programme. The product is built for volume, with promotions running on a weekly cadence.

The product does not carry a New Zealand licence. The licence the brand names is for a jurisdiction that does not grant the right to take bets from people in New Zealand, and the same section 74AAA constraint that applies to every other offshore brand on this list applies here.

The verdict: BillyBets is a feature-rich offshore bookmaker with a strong promotion calendar. The reader who already bets on offshore platforms will recognise the product. The reader who is betting from New Zealand is paying the price of a strategy that has no New Zealand counterparty, and the New Zealand reader has no regulator to fall back on if a dispute goes the wrong way.

Roobet

Roobet is the brand name of Raw Entertainment B.V., a company registered in Curaçao under number 157205, operating under Curaçao licence OGL/2024/687/0427. The site is best known for its casino product, with a sportsbook attached. Like every other operator on this list outside the TAB NZ group, it is not licensed to take bets from people in New Zealand, and the same law applies.

The product is what the brand makes of a Curaçao licence. The dispute route a New Zealand reader might have to walk is the route a Curaçao licence offers, which is not a New Zealand route.

The verdict: Roobet is a Curaçao-licensed offshore operator with a strong casino product. A New Zealand reader has no operator-side access to it, and the regulator on the other end of a complaint is not a New Zealand one. Reference only.

22Bet

22Bet takes single bets, accumulators, systems and chains, and runs a live betting product with real-time odds and score updates. The product set is broad. The licence is Curaçao (8048/JAZ), held by TechSolutions Group N.V., which is the same architecture as Roobet: a Curaçao holder, no New Zealand reach.

For a New Zealand reader the practical question is the same. A bet struck on 22Bet from a New Zealand address is one the operator is not permitted to take, and a dispute that goes wrong is a dispute the New Zealand complaints framework does not see.

The verdict: 22Bet is a broad-product offshore bookmaker with a serious live offering. The New Zealand reader can study the product; the New Zealand reader cannot lawfully place the bet, and no local regulator is the destination of a complaint.

Rabona

Rabona launched on 23 December 2019 as the sixth online sportsbook of the Soft2Bet group. The product is a Soft2Bet product, with the same platform architecture that several other brands on this list run on. The licence is Curaçao. The product surface is broad: pre-match, live, a casino, promotions, the standard offshore product mix.

The constraint is the constraint of the licence. A New Zealand reader on a Rabona account is on an account the operator is not permitted to serve.

The verdict: Rabona is a Soft2Bet-platform bookmaker with the same product mix as its sister brands. A New Zealand reader cannot lawfully use it; the offshore product is reference, not a working option.

Golden Panda

Golden Panda publishes dedicated sports terms and conditions that cover fixed-odds betting, Combo Bets, the Bet Builder feature, live scoreboards and broadcasts, and stake and odds limits. The site names no licence that applies in New Zealand, and the standard section 74AAA constraint applies.

The product is one more offshore bookmaker. The constraint is the same one.

The verdict: Golden Panda is a small offshore bookmaker with a published set of sports terms and conditions that a reader can read. A New Zealand reader can read the terms and conclude that the operator is not licensed to take the bet, and that is the page’s reading of it.

BetNinja

BetNinja is licensed to conduct online gaming operations by the Union of the Comoros. The Union of the Comoros is a small island jurisdiction with a light regulatory touch and a different consumer-protection framework from New Zealand’s. Like every other offshore brand on this list, the licence does not extend to taking bets from people in New Zealand, and the operator carries the same risk under section 74AAA.

The product is an offshore product. The reader is in New Zealand. The two are not the same market.

The verdict: BetNinja is an offshore bookmaker licensed in a jurisdiction that does not extend that licence to New Zealand. The product is what the product is; the New Zealand reader has no access to it under the current law.

FunBet

FunBet runs a sportsbook with odds on football, ice hockey, American football, basketball, volleyball, tennis, rugby and baseball, with live betting and a 24/7 bookmaker. The licence the brand names is not a New Zealand licence, and the same section 74AAA constraint applies.

The product is a mainstream offshore sportsbook with a wide sport menu. The constraint is the same as every other operator in this group.

The verdict: FunBet is a wide-market offshore bookmaker with live betting. The reader is in New Zealand, and the operator is not licensed to take the bet. Reference only.

The legal picture for a New Zealand punter

The monopoly and what it covers

The Racing Industry Act 2020, as amended by the Racing Industry Amendment Act 2025 with effect from 28 June 2025, makes TAB New Zealand the only operator allowed to take racing and sports bets from people in New Zealand. The law does not stop at New Zealand-registered companies; it captures any operator serving a person who is in New Zealand, regardless of where the operator is incorporated. The Department of Internal Affairs told unlicensed providers serving New Zealand to withdraw with immediate effect when the law came into force. There is no application route for another bookmaker, and there is no licence register for betting in New Zealand because there is only one lawful operator.

TAB and Betcha are the two online brands of TAB NZ, run under a long-term partnership with Entain signed in 2023. Entain runs the TAB business under a 25-year agreement that gives Entain a 50/50 share of gross profits, with at least $150 million a year going to TAB NZ for the first five years and a one-off $100 million payment to the racing sector. From a punter’s perspective, the two brands are the same operator; from a regulator’s perspective, they are the same operator. They are not rivals, and an arbitrage strategy that splits bets between them is a strategy that splits bets between two shopfronts of one bookmaker, which is a single-bookmaker strategy with extra steps.

The Online Casino Gambling Act 2026 licences online casino gambling and does not licence sports betting. TAB New Zealand winning the right to apply for a casino licence does not extend the betting monopoly. Greyhound racing is closing in stages from 1 August 2026, and from that date offshore operators may not take bets on greyhound races in New Zealand either.

What the law says about a player who bets offshore

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 page takes that at face value: the law targets the operator, the regulator is the Department of Internal Affairs, and no source has published a penalty for the player. The page does not call betting offshore legal, and the page does not call it illegal for the player. The honest framing is the regulator’s: TAB NZ and Betcha are the only lawful option, with New Zealand harm-minimisation tools, regulator oversight and a complaints framework; an offshore operator is unlawful for the operator to serve New Zealand, has no New Zealand complaints route, and is exposed to the regulator’s stated risks on unspent credits, payouts and account treatment.

What the law says about the operator

The operator side is the side the regulator enforces. An overseas bookmaker taking sports or racing bets from a person in New Zealand is breaking New Zealand law, by the regulator’s own statement. The penalty for breaching section 74AAA is not stated in the section, and no prosecution of an offshore bookmaker was found in the public record. This analysis avoids guessing at enforcement; it notes only that the law is on the books and the regulator has stated its reading of it.

Tax

For a New Zealand punter, Inland Revenue guidance says recreational gambling winnings are generally not taxable and prize money from TAB horse, dog and trotting races is not taxable. A person who bets as a business is a different case and the page points the reader to Inland Revenue or an accountant for that conversation. Operator side: TAB NZ pays a Problem Gambling Levy of 0.74% for the period from 1 July 2025 to 30 June 2028. Overseas operators supplying New Zealand residents pay online gambling duty of 12% of profits from 1 July 2024, rising to 16% from 1 January 2027. A duty being payable does not make an offer lawful; the page does not write that tax payment shows a bookmaker is legal. The point-of-consumption charge on offshore racing and sports bets ceased on 30 June 2026.

Advertising and the ASA

The Advertising Standards Authority’s Gambling Advertising Code applies to betting advertisements. Ads must not target children (under 14) or young people (14 to under 18), judged by context, appeal and expected audience — 25% or more of the audience counts as significant where accurate data exists — and must not encourage harm, and must be truthful with terms available. Because only TAB NZ may offer betting in New Zealand, the Department of Internal Affairs reads the prohibition as covering promoting or taking such bets for another operator. How the regulator treats betting affiliates is not established. The page describes the monopoly and does not invite readers to sign up with an offshore brand.

Safer gambling in a single-bookmaker market

The safer-gambling tools the law expects a New Zealand punter to have are the tools TAB NZ lists in its app: deposit limits, time-outs and self-exclusion. A self-exclusion on TAB NZ applies across both brands, so a punter who excludes on TAB is excluded on Betcha as well. There is no single national online-betting exclusion register; the register the 2026 online casino law will require is for online casinos only, not for the racing and sports monopoly.

The minimum age for TAB NZ betting is 18. Land-based casinos have a higher age of 20; the page keeps the two separate. Betting under 18 is an offence under section 89 of the Racing Industry Act 2020. TAB NZ accounts need a verified New Zealand address and ID, and the verification step is the regulator’s way of keeping the monopoly working: only a New Zealand account can stake on the platform.

Help when a punter needs it is a phone call away. The free Gambling Helpline is 0800 654 655, with a text line at 8006, and Safer Gambling Aotearoa publishes a wider set of resources for harm minimisation. A punter who finds the strategy is not the strategy they wanted — a punter who started the year with an arbitrage plan and ended it with a daily deposit habit — has the same access to those numbers as any other punter in New Zealand. It is not the role of this guide to argue that an arbitrage punter is or is not a problem gambler; its focus is to keep the help line in the same sentence as the strategy.

Crypto, anonymity and the offshore product

What the law says about paying in

The page found no statutory payment rule for New Zealand betting accounts, on card, bank, credit, prepaid or crypto. TAB NZ’s deposit methods and limits are operator-level and come from its terms, not from a regulator. The Department of Internal Affairs warns that overseas operators may be in jurisdictions with minimal consumer safeguards, may not return unspent credits and may not pay out large wins. No payment-blocking order or bank obligation was found. Nothing in the public record states a rule on crypto or VPN use, and account opening at TAB NZ requires a verified New Zealand address. The honest reading is: TAB NZ pays in the way TAB NZ says it pays in, and a New Zealand punter’s path to a crypto-funded offshore bookmaker is the same path the regulator warns about.

Why the crypto-and-arbitrage story does not match the New Zealand picture

The arbitrage-and-crypto narrative that several offshore products are built around assumes a punter can fund a bookmaker in bitcoin, place a bet, and withdraw in bitcoin without ever crossing a bank. In a New Zealand context the model does not survive the section 74AAA constraint: a New Zealand punter cannot lawfully place a bet with the offshore bookmaker in the first place, and the funding rail is not the thing that makes the bet unlawful. The crypto angle does not change the law, and a strategy that depends on offshore bookmakers running on a Curaçao licence does not become a New Zealand strategy by changing the unit of account.

What the law does not do

New Zealand does not block bookmaker sites. The liability is on the operator, not on the network. There is no published order that requires an internet service provider to maintain a blocklist of gambling domains, and the regulator’s approach has been to go after the operator rather than the connection. This guide avoids recommending a workaround; it aims to say what the law does and does not do, and leave the rest to the reader and the regulator.

The cost, in one band

The illustrative margin the page uses

The prescribed calculation for this page is the margin on a two-way market, and the inputs the page uses are decimal odds of 1.90 and 1.90. The implied probability on each side is 1 / 1.90, which is 0.526. Sum the two and the market sits at 1.053, or 105.3% — a 5.3% overround, and a margin of 5.3% on every unit bet on this market. A two-way market at 1.85 and 1.95 sums to about 1.054, also a 5.4% margin. A two-way market at 2.00 and 2.00 sums to 1.000, a margin of zero, which is the fair market the bookmaker almost never offers.

The cost to the punter, stated as a band

A typical New Zealand racing or sports market on TAB NZ sits at a margin between roughly 5% and 8% on the headline match-result market, with wider margins on smaller markets and on combination bets. The narrower the market, the wider the margin, because the bookmaker has less information to price against and a longer shot at the long tail. The page does not pin a single figure on TAB NZ’s market-by-market margin, because the margin varies by sport, market and event, and the regulator does not publish a single weighted figure. The honest band is the band the page will give: a punter betting on a TAB NZ headline market pays the bookmaker roughly five to eight cents on every dollar staked over the long run, before any bonus or promotion. The cost of the monopoly, in other words, is the cost of every bet on the platform, paid in margin.

The cost of the strategy the law does not allow

For a punter considering an arbitrage strategy inside the New Zealand framework, the cost is the cost of a strategy that does not exist. A single bookmaker has no second side to arb against, and the only way to construct a multi-bookmaker strategy is to bet with operators the law says may not take the bet. The cost of that strategy is the cost of breaking the law at the operator side and the cost of losing the New Zealand complaints framework, the deposit limits and the self-exclusion that the law expects. The page’s reading of that is the regulator’s reading: the strategy is not a strategy in New Zealand, and the cost is the cost of pretending it is.

A reader’s working notes

How to read a TAB NZ market

Open a TAB NZ market and find the margin. The two-way price is on the screen. Convert each price to 1 / odds, sum them, and the result is the market’s overround. A 1.90 / 1.90 market is a 5.3% margin. A 1.70 / 2.20 market is 1/1.70 + 1/2.20, or 0.588 + 0.455, or 1.043, a 4.3% margin. The narrower the margin, the closer the market is to fair, and the punter is paying the bookmaker a smaller cut per dollar. The wider the margin, the more the bookmaker is keeping, and the punter is paying a higher cost for the same selection.

How to size a stake to a budget

A punter with a $200 weekly budget on TAB NZ and an expected loss rate of 5% on the headline market is paying about $10 a week to the bookmaker in margin, before any bet wins. A punter with a $2,000 budget on the same market is paying about $100 a week. The cost scales with the bankroll, which is the one cost the bookmaker’s marketing never puts on the page. The strategy that holds the budget constant — deposit limits, weekly caps, a hard stop at a defined number — is the strategy the law expects, and it is the strategy the platform supports through its deposit-limit tool.

What to check before a bet

The terms. The market. The odds. The maximum stake. The settlement rule. The promotion, if any, and what the promotion’s own conditions ask of the punter. The clock on the bet — the in-play market, the place bet, the quinella. Each of these is a number the punter can read before the bet is struck, and each is a number the punter cannot change after the bet is struck. The bookmaker’s margin is the silent number on every bet slip, and a punter who wants to know what the bet costs reads the margin before the bet, not after.

Closing notes

The arbitrage strategy in this page is real, the maths is sound, and the 1.2% typical margin the literature reports is the figure a working strategy is built on. The 2012 study is the right study to cite, and the page cites it once. The Racing Industry Act 2020, as amended in 2025, is the right law to cite, and the page cites it as the regulator reads it. The Department of Internal Affairs is the right regulator, and the page treats its warnings as the regulator’s own.

A New Zealand punter reading this page is a punter with a single lawful counterparty and a regulator who is clear about the constraint. The arbitrage strategy is not a strategy in New Zealand, and this guide does not recommend one. It describes what the strategy is, what it costs, and what the law asks of a punter who might run it.

Frequently asked questions

Does sports arbitrage betting work?

The maths works. An arbitrage bet locks in a small return on turnover where two bookmakers price the same market at implied probabilities summing to less than one. The 2012 study by Franck, Verbeek and Nüesch found that 98% of arbitrage opportunities return less than 1.2% on the total stake, so the strategy asks for a large bankroll. Bookmakers detect the pattern quickly and often restrict or close the account.

How does a punter arbitrage a bet?

Place a bet on each possible outcome of an event at different bookmakers, weighting the stake on each side so the payout is the same whichever result lands. The window between finding the misprice and getting both bets confirmed is short, the bookmaker’s margin is the silent cost on every leg, and the strategy requires a bankroll large enough to back both sides in full. In New Zealand, only TAB NZ may lawfully take a sports or racing bet, which collapses the strategy at the source.

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

The return is the stake multiplied by the decimal odds. A $50 bet at 1.90 returns $95, with $45 of that being profit. Decimal odds already carry the stake. A combination bet multiplies the odds of the legs into one price before applying the stake.

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

TAB and Betcha, the two online brands of TAB New Zealand, are the only operators allowed to take online sports and racing bets from people in New Zealand, under section 74AAA of the Racing Industry Act 2020, in force since 28 June 2025. No other bookmaker is licensed to take such a bet, and there is no application route for another licence.

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

The margin is the cut the bookmaker takes off every unit bet on a market. Convert each decimal price to its implied probability of 1 / odds, sum across all outcomes of the market, and the result is the market’s overround. A 1.90 / 1.90 market sums to 1.053, an overround of 5.3% and a margin of 5.0%. The wider the overround, the more the bookmaker keeps on every dollar staked.

Prepared by the Nzbettingtips editorial staff.