Arbitrage Betting in New Zealand 2026: The Maths, The Monopoly, and the Account Risk

Updated October 2026

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*Current as of October 30, 2026 · Cross-checked against the Racing Industry Act 2020 (as amended 2025) and operator terms as published*

Arbitrage betting sounds like the cleanest trick in the book: back every outcome, walk away with the difference. In New Zealand the arithmetic is the same as anywhere else, and the constraint that decides whether it is even possible is not arithmetic at all. Since 28 June 2025, an amendment to the Racing Industry Act 2020 has left a single operator group — TAB NZ, trading under the brands TAB and Betcha — as the only provider lawfully permitted to take online sports and racing bets from people in New Zealand. A strategy whose entire mechanism is having several bookmakers quote different prices cannot be run inside that one brand. The rest of this page works through how the math works on paper, what the same math looks like in practice, and what the New Zealand picture does to it.

What Arbitrage Betting Actually Is, and What It Costs You to Run

The idea, in one sentence

An arbitrage opportunity exists when the odds on every mutually exclusive outcome of an event, taken across one or more bookmakers, imply probabilities that add up to less than one. Bet on all sides, in the right proportions, and the return beats the total stake regardless of which outcome lands.

That is the entire pitch, and it is mathematically true. The catch is the word “imply”. Decimal odds are the inverse of an implied probability — a price of 2.00 implies a 50% chance, a price of 4.00 implies a 25% chance. When bookmakers disagree about the true probability of an outcome, their prices will disagree, and on the rare event where every price is generous enough, the implied probabilities across all outcomes sum to less than one. That gap, scaled by the size of your stake, is your net return if all legs settle correctly.

Why the gap is almost always tiny

Bookmakers compete with each other and with their own liability models. The gap that survives all of that is small. A 2012 study by Franck, Verbeek and Nuesch, summarised in the public literature on the subject, found that 98% of arbitrage opportunities returned less than 1.2% on the capital deployed. In other words: the typical arbitrage opportunity pays you less than one-and-a-bit cents back for every hundred dollars you commit to it.

Read that the right way. A 1% return on a single arbitrage trade is not a poor return — it is a guaranteed return, which is something almost no other bet on the same market offers. The problem is the second word: capital. To make a 1% arbitrage worth the time it takes to place, monitor and settle the bets, the stake has to be large. The conclusion bettors, the literature and the trade press keep returning to is that arbitrage betting is a high-volume, low-margin business dressed up as a low-risk one.

The transaction has a hidden price

The maths above assumes you can place the full stake at the published price. Three things erode that assumption before you make the first bet:

• One side of the trade gets pulled. Bookmakers adjust prices in real time, and an arb that looked live at 9:14am can be gone by 9:15am. You place half the trade at one bookmaker and watch the other side disappear.
• Limits cap how much you can stake. Maximum wager limits on fall arbitrage books often drop sharply, and one leg of the trade may simply not accept the size you need to balance it.
• Settlement is not always clean. In the past, bookmakers have been known to cancel one leg of an arb after the event, void the bet, or close the account altogether.

Bookmakers usually detect arbitrage betting quickly and view it unfavourably; maximum wager limits on such accounts often drop sharply, and in the past half of an arbitrage bet might be cancelled or the account closed. That is not a worst-case. It is the documented history.

A worked margin, to see what the gap really buys

Take a two-way market priced at 1.90 on each side — the kind of line you might see on a tennis match, a basketball spread where the prices have been rounded, or an evenly-matched football game. The implied probability of one outcome is 1 ÷ 1.90 = 52.63%. Add the other side, and the two implied probabilities sum to 105.26%. That is the bookmaker’s margin, dressed up as two prices: the bookmaker keeps 5.26% of every dollar matched on this market, in the long run.

To turn this into an arb, both prices have to be too generous at once. If both books quoted 2.10 instead of 1.90, the implied probabilities sum to 95.24% — a 4.76% arb in your favour. If both quoted 2.05, the implied probabilities sum to 97.56% — a 2.44% arb. Real-world arbs rarely exceed a percent or two, and the bulk of them, per the Franck-Verbeek-Nuesch figure, sit below 1.2%.

The point is mechanical, not motivational: the lower the implied probability sum, the higher the return on the capital you commit, and the smaller the population of events where that gap exists. Most arbs are sub-1%. Most arbs also vanish within minutes. The arithmetic works; the operation does not pencil out for a casual bettor.

How the Math Goes When You Roll One Bet Into Another

A payout, on a single bet

Return on a winning single bet is the simplest calculation in the book. Return equals stake multiplied by the decimal odds. Net profit, after the stake comes back, is stake multiplied by (odds minus one). A $10 stake at odds of 3.50 returns $35 — the $10 stake plus $25 of net profit. That is a winning bet’s payout; it is what the slip says at the bottom and what the bookmaker pays into your account.

That formula is the same everywhere, including on TAB NZ’s fixed-odds sports markets and on the betting exchanges that operate in other jurisdictions but not here. New Zealand does not have a lawful betting exchange, so a New Zealand bettor who wants to lay a selection off has nowhere in the domestic market to do it.

A payout, on a combination bet

A combination bet — a multi, an accumulator, a Same Game Multi — multiplies the decimal odds of each leg together into one combined price. A four-leg multi with legs at 1.80, 2.10, 1.95 and 2.50 carries a combined price of 1.80 × 2.10 × 1.95 × 2.50 = 18.43. A $5 stake returns $92.14 if all four legs win. Each additional leg multiplies the price and multiplies the chance that one of them does not land; the combined price is not the bettor’s edge, it is the bettor’s reward for surviving the chain.

The bookmaker’s margin compounds the same way. If each leg has a margin of 5%, the combined multi has a margin meaningfully higher than 5%, because each leg’s vig is multiplied into the next. A multi is a worse bet, mathematically, than any of its legs on their own — even before the bettor accounts for the chance of a single loss voiding the whole ticket.

A margin, in the abstract

The margin on a single market, taken in isolation, is the difference between one and the payout share. Payout share is one divided by the sum of one-over-each-decimal-odds across all outcomes of the market. For a two-way market at 1.90 and 1.90, that sum is 1 ÷ 1.90 + 1 ÷ 1.90 = 1.0526. One divided by that is 0.9501. The margin is one minus 0.9501, or about 4.99% — the figure derived a moment ago, restated as a margin. That number, the share of every matched dollar that the bookmaker keeps over the long run, is the price of doing business on a market. It is built into every price you see and never printed beside any of them.

What that margin does to a free bet, if the bookmaker hands you one

The bookmakers named later in this page run offers that, in the marketing, are described as “free bets” or “bonus bets”. The arithmetic of what such a stake is actually worth depends on whether the stake comes back with a win. Where the stake is not returned — and that is the usual case for a free bet in this market — the value of the free bet to the bettor is the free-bet amount multiplied by (odds minus one) divided by odds, then multiplied by the payout share of the market the bet is placed on. A $10 free bet at odds of 3.00, on a market whose payout share is 95%, is worth $10 × (3.00 − 1) ÷ 3.00 × 0.95, which is $6.33. That is the expected value; what any individual bet pays out depends on whether it wins.

The point of working that out is not the specific dollar amount. It is that a free bet is not a $10 credit; it is an expected value somewhere south of the headline figure, and the more generous the odds and the tighter the margin, the closer to the headline the value climbs. The reverse is also true: at short odds on a high-margin market, the free bet is worth much less than the marketing implies. “Free” is doing a lot of work in the offer’s name.

Which Bookmakers Can Even Take Your Bet, and What That Does to the Strategy

The 2025 monopoly, in plain terms

Since 28 June 2025, an amendment to the Racing Industry Act 2020 — section 74AAA — has been in force. The provision is short and absolute: 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 told unlicensed providers serving New Zealand to withdraw with immediate effect.

There is no licence route to apply for, no register of bookmakers to consult, and no second operator lawfully offering the same product. The monopoly is structural, not competitive: TAB NZ does not have a rival because the law does not allow one to exist.

What TAB NZ actually runs

TAB NZ is one operator group, not two. TAB NZ trades under two brands — TAB itself and Betcha — and the two are the only lawful online sports and racing operators in the country. The platforms are run under a 25-year partnership signed in 2023 with Entain, the global betting group, under which Entain and TAB NZ split gross profits 50/50, with at least $150m a year flowing to TAB NZ for the first five years and a one-off $100m payment from Entain to the racing sector. The two brands share ownership, payout, and customer protection; they are not rivals.

That matters for arbitrage in a specific way. An arbitrage trade, by construction, needs at least two bookmakers quoting different prices. With a single operator group on the lawful side of the New Zealand market — even one that operates two consumer-facing brands — there are no two prices to compare. The mechanism of the trade, in New Zealand, has nowhere to operate against a second lawful quote.

What offshore brands are, and what they are not

The bookmakers named further down this page — Glorion, BillyBets, Roobet, 22Bet, Rabona, Golden Panda, BetNinja, FunBet — are listed because New Zealand bettors encounter them, and the page owes the reader a description of what each one is. None of them holds a New Zealand licence, because no licence is available to hold. Each names a non-New Zealand regulator — Curaçao, the Union of the Comoros, the Tobique Gaming Commission, Costa Rica — none of which allows bookmakers to accept local customers.

DIA’s warning, published alongside the 2025 amendment, is that overseas operators may be in jurisdictions with minimal consumer safeguards, may not return unspent credits, and may not pay out large wins. The Department does not name a penalty for a player placing a bet 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 law targets the operator, not the player. The published risk is consumer protection: no New Zealand complaints route, no New Zealand harm-minimisation framework, and a withdrawal that may not arrive.

For arbitrage specifically, the offshore side has a second problem on top of the legal one. Offshore bookmakers are the ones most likely to run aggressive anti-arbitrage policies: short price windows, low limits on accounts flagged as arbers, voiding on terms they argue cover the bet. Running an arb through offshore brands only adds the bet-settlement risk to the legal one.

What an arbitrage trade looks like in New Zealand, in 2026

A New Zealand bettor who wants to run an arbitrage trade today, lawfully, has only one operator group to run it against. Two prices within the same operator are not arbitrage — they are two sides of the same book. The strategy, as described, requires multiple bookmakers, and multiple bookmakers are not available lawfully inside New Zealand.

Offshore | (Account at an offshore bookmaker, drawn from those listed below) — a New Zealand resident can open one, but the operator is in breach of section 74AAA, the bettor has no New Zealand complaints route, and the bookmaker’s anti-arb policies may apply. Some offshore books accept New Zealand customers quietly; others geo-block or close the account on verification. Neither path is what the strategy assumes.

What “Safe Gambling” Means When There Is Only One Bookmaker

The tools TAB NZ is required to make available

TAB NZ’s app lists the safer-gambling tools a New Zealand bettor can actually use: deposit limits, time-outs, and self-exclusion. The exclusion applies across both TAB NZ brands — TAB and Betcha — so an account closed on one is closed on both. The age for a TAB NZ account is 18, verified by New Zealand ID and address at sign-up.

The harm-minimisation framework is operator-level rather than national. The register the 2026 Online Casino Gambling Act will set up is for online casinos only; there is no single national online-betting exclusion register to add a TAB NZ account to alongside other gambling products. For a bettor who wants to step back across the full range of legal gambling in New Zealand, the relevant step is self-exclusion at each operator separately.

The levy, and what it pays for

TAB NZ pays a Problem Gambling Levy of 0.74% — in force from 1 July 2025 to 30 June 2028. The levy funds public-health work on gambling harm, including the free Gambling Helpline (0800 654 655, text 8006) and Safer Gambling Aotearoa. Those are the routes a New Zealand bettor can actually call: not a brand’s complaints desk, but a national service funded by the monopoly operator’s levy.

What offshore brands offer, and what they do not

The offshore brands listed in the comparison below are not subject to the Problem Gambling Levy, are not part of the New Zealand harm-minimisation framework, and do not feed the Gambling Helpline. They have their own self-exclusion tools, where they offer them at all. A New Zealand bettor using an offshore brand has, by design, stepped outside the harm-minimisation system the New Zealand regulator sets up. That is one of the DIA-published risks, and it is the one that is hardest to reverse once it matters.

Where to get help

If gambling — on TAB NZ, on an offshore bookmaker, on any product — is becoming a problem, the Gambling Helpline (0800 654 655, text 8006) is free and confidential. Safer Gambling Aotearoa is the public-facing programme funded by the levy. Both routes are open regardless of which bookmaker the bets were placed with.

Crypto, Anonymity, and the Offshore Side of the Trade

What crypto changes, technically

Some offshore bookmakers take deposits in cryptocurrency. Roobet, named below, is one of them. Crypto deposits settle faster than bank transfers, are not blocked by New Zealand banks the way card transactions on gambling merchants sometimes are, and do not leave the same paper trail a card payment does. For a bettor, those are operational differences.

For an arbitrage trade, crypto is not a strategy — it is a settlement rail. The price discrepancy that creates the arb is the same whether the stake is funded in NZD, USD, or BTC. The fact that a crypto deposit settles in minutes rather than days means the bettor can rotate capital faster, which is a real operational advantage, and it is also exactly the kind of operational advantage that gets an account flagged as an arber faster.

What crypto does not change, legally

Crypto deposits do not move an offshore bookmaker inside the New Zealand monopoly. Section 74AAA prohibits the offer of betting to a person in New Zealand, regardless of payment method. The Department of Internal Affairs’ published risk warning applies to crypto-funded accounts as much as to fiat-funded ones. There is no New Zealand rule that makes crypto deposits legal where card deposits are not.

Anonymity, and the limits of it

A New Zealand bettor who uses crypto to deposit at an offshore bookmaker has, in operational terms, more privacy from the bank. From the bookmaker, they have very little: the bookmaker knows the wallet address, the deposit and withdrawal amounts, the bet history, and the IP address the bets were placed from. A VPN that hides the IP from the bookmaker does not change any of the others. The bookmaker’s KYC process, when it kicks in — usually at withdrawal — can demand ID; refusal closes the account; compliance closes can lock funds.

For an arbitrage bettor, the picture is bleak. The whole point of the trade is to run the same identity across several books; that is what makes the bookmakers’ anti-arb policies so effective. A bettor who hides their identity from one book loses the edge that comes from being a known customer with a long history. A bettor who is known is the first account flagged.

The Comparison: What the Operators Named Here Actually Are

The table below is not a ranking. TAB and Betcha are the only operators lawfully permitted to take sports and racing bets from people in New Zealand. The remaining brands are offshore operators New Zealand readers meet, and are listed because a comparison the reader can use names them and judges them rather than pretending they do not exist. The “what the operator’s own terms state” column summarises the offer each one makes on its own page; readers must check the operator’s own terms before staking.

TAB

TAB is the flagship brand of TAB NZ. It is one of the two lawful online sports and racing brands in New Zealand, and the one most readers meet first — partly through retail outlets, partly through the long history of the TAB in New Zealand racing culture, partly because the betting menu of fixed-odds and tote bets is the deepest of any lawful New Zealand operator. The safer-gambling tools (deposit limits, time-outs, self-exclusion) are listed in the TAB app, and an exclusion spans both TAB and Betcha.

For a New Zealand reader who wants to bet on a New Zealand race, a Super Rugby match, an All Blacks test, an NRL game, a Black Caps fixture, or a Melbourne Cup field, TAB is the only lawful place to do it. The arithmetic on offer is the arithmetic of a single bookmaker — no arb inside the brand, no second price to compare against.

The verdict: the lawful, regulator-backed option for New Zealand racing and sports. A bettor who wants to bet on New Zealand sport lawfully bets here, and the only mechanical constraint is that the strategy of arbitrage has nowhere inside the brand to operate.

Betcha

Betcha is the second brand of TAB NZ. It carries the same licence as TAB — same operator group, same section 74AAA authority — and it is aimed at a younger, mobile-first audience. The product is built around three daily features: a Toolbox of odds boosts and insurance tools on losing bets, a Bet Social section where punters chat, follow tipsters and share bets or pools, and a Playbook with match analysis. The brand is positioned as the social-betting layer of the monopoly; the underlying liability and the betting rules are TAB NZ’s.

For a New Zealand reader, the calculus on Betcha is the same as on TAB for legality and consumer protection. The difference is product surface: social features and odds boosts in addition to a fixed-odds sportsbook. For an arbitrage bettor, the same constraint applies: Betcha and TAB are the same book.

The verdict: the lawful, social-betting alternative under the same monopoly. A reader who likes tipsters and shared slips uses Betcha; a reader who wants the deepest racing product uses TAB; both are the same operator.

Glorion

Glorion is an offshore provider operating without a local licence. The brand’s own terms describe a customer service operation (live chat and email) and an over-18 age policy, which is standard for the offshore segment and offers no New Zealand consumer protection. No New Zealand complaints route or harm-minimisation framework reaches it.

For a New Zealand reader, Glorion is one of the offshore brands a search results page will surface. There is no New Zealand reason to prefer it over any other offshore brand on the list, and no legal protection if a withdrawal stalls or a bet is voided on contested terms.

The verdict: an offshore brand with no New Zealand licence. A reader who wants to bet offshore at all has many options; this is one of them, and it offers no New Zealand-specific advantage.

BillyBets

BillyBets is an offshore provider serving players here without a local licence. The product surface is broad: a sportsbook with cashback and reload bonuses, a coin shop where coins earned through play can be exchanged for free bets and free spins, and a five-level VIP programme. Odds are offered in three formats — decimal, American and fractional — which is a usability advantage for readers used to one format who want to see another. None of those features is unique in the offshore segment.

For a New Zealand reader, the offer is the same shape as several other offshore brands on this list: bonuses, loyalty, multi-format odds, no New Zealand licence. The coin shop is a specific feature worth noting if a reader is shopping on that axis; otherwise, the comparison is on licence and consumer protection, both of which point to TAB NZ.

The verdict: an offshore brand with bonus and loyalty features that mirror the segment, and no New Zealand licence. The multi-format odds display is the only product surface that stands out.

Roobet

Roobet is a Curaçao-licensed operator (OGL/2024/687/0427, holder Raw Entertainment B.V.). The brand runs a crypto casino and sportsbook, accepting deposits and withdrawals in supported cryptocurrencies. For a New Zealand reader who specifically wants to use crypto, Roobet is one of the more visible brands in that niche. The Curaçao licence is one of the more common offshore licences in the segment and provides no authority for the operator to serve players here.

For a New Zealand reader, the calculus is the standard offshore calculus: no New Zealand complaints route, no New Zealand harm-minimisation framework, and a withdrawal that depends on the operator honouring its own published terms. The crypto deposit is an operational feature, not a legal one.

The verdict: a crypto-native offshore brand with a Curaçao licence. A New Zealand reader who chooses to bet offshore and wants crypto rails picks from this segment; Roobet is one of the larger names in it, though it lacks the regulatory standing of the domestic provider.

22Bet

22Bet is a Curaçao-licensed operator (8048/JAZ, holder TechSolutions Group N.V.). The sportsbook takes single bets, accumulators, systems and chains, and offers live betting with real-time odds and score updates. The product surface is broad by offshore standards. The Curaçao licence is common in the segment and confers no right to take bets from people in New Zealand.

For a New Zealand reader, 22Bet is one of the larger offshore names a search will surface. The chain bet — a sequential accumulator where the winnings of one leg become the stake of the next — is a specific product feature worth noting if a reader is shopping on bet-type variety. Otherwise the comparison is the same as the rest of the segment.

The verdict: a broad-product offshore brand with a Curaçao licence. The chain bet is a differentiator inside the segment; the lack of a local licence makes it less suitable than the domestic choice.

Rabona

Rabona is a Curaçao-licensed offshore operator and part of the Soft2Bet group. The brand launched on 23 December 2019 as the sixth online sportsbook in the group.

For a New Zealand reader, Rabona is one of several Soft2Bet-group brands a search will surface, and the comparison between them is on product surface rather than licence. The launch date is the only specific fact on the operator’s terms page that distinguishes it from the rest of the segment.

The verdict: an offshore sportsbook with a Curaçao licence, part of a multi-brand group. The launch date is the only specific fact that distinguishes it on its own terms page, which is not an edge over local alternatives.

Golden Panda

Golden Panda is an offshore operator that does not name a licence that applies in New Zealand. The sportsbook publishes dedicated Sports Terms and Conditions covering fixed-odds betting, Combo Bets, a Bet Builder feature, live scoreboards and broadcasts, plus stake and odds limits. The clarity of the published sports terms is unusual in the segment — most offshore brands publish a general “terms” page that bundles sports and casino rules.

For a New Zealand reader, the published sports terms are a usability advantage: a reader can read the rules of the bet they are about to place without wading through casino terms. That is the one specific feature that distinguishes Golden Panda from the rest of the segment on its own terms page.

The verdict: an offshore brand with unusually clear published sports terms. That is a real but small advantage for a reader who reads terms before betting, though it remains an offshore-only option.

BetNinja

BetNinja is an offshore operator that names a licence from the Union of the Comoros. The Comoros licence is one of the smaller offshore licences and confers no right to take bets from people in New Zealand. The brand’s product surface on its own terms page is limited compared to the rest of the segment.

For a New Zealand reader, BetNinja is one of the smaller offshore names a search will surface. The Comoros licence is the smallest and least-tested of the licences named on this list. The comparison is the same as the rest of the segment on New Zealand terms.

The verdict: an offshore brand with a small-jurisdiction licence. The licence is the smallest on this list by name recognition, which is not a compelling reason to prefer it to the New Zealand-licensed option.

FunBet

FunBet is an offshore operator that does not name a licence that applies in New Zealand. The sportsbook offers odds on football, ice hockey, American football, basketball, volleyball, tennis, rugby and baseball, with live betting described as open 24/7. The sport menu is broad; the “open 24/7” framing of live betting is a marketing positioning rather than a product feature unique to the segment.

For a New Zealand reader, FunBet is one of the offshore brands a search will surface. The sport menu covers most of what a New Zealand reader expects from a sportsbook — rugby and tennis especially — and the live-betting framing is standard for the segment. The comparison is the same as the rest of the segment on New Zealand terms.

The verdict: an offshore brand with a broad sport menu. The product surface is standard for the segment, and cannot compete with the domestic operator’s compliance footprint.

The Question Most Readers Came Here With

Where the page leaves the reader

A New Zealand bettor who wants to bet on New Zealand racing or sport bets on TAB or Betcha. A New Zealand bettor who wants to run an arbitrage strategy has, in 2026, two paths: stay lawful and accept that the strategy does not run on a single operator group, or step outside the lawful market and accept the consumer-protection risk of an offshore bookmaker that is itself in breach of section 74AAA for taking the bet. The math is the same on both paths. The legal and consumer-protection picture is not.

For a reader who wants to read the strategy in the wider literature, the public resources on the subject describe the math, the history, and the anti-arbitrage response of the industry. For a reader who needs to step back from gambling in New Zealand, the Gambling Helpline (0800 654 655, text 8006) and Safer Gambling Aotearoa are the routes. Both are open regardless of which bookmaker the bets were placed with.

Frequently Asked Questions

Does sports arbitrage betting work?

The math works on paper: when implied probabilities across all outcomes of a market sum to less than one, a bettor who backs every outcome in the right proportions locks in a return. In New Zealand, the strategy cannot be run against the only lawful operator alone, because a single operator does not produce two independent prices. Running the strategy against an offshore brand is not the same trade — the operator’s anti-arbitrage policies, the voiding risk, and the New Zealand regulator’s published warning are all part of the expected cost.

How to arbitrage bet?

The mechanics are: identify a market whose prices across bookmakers imply probabilities summing to less than one; split the total stake across the outcomes in proportion to the inverse of each price; place all bets before any of the prices move; collect the return whichever outcome lands. The execution is harder than the description. Prices move within minutes. Limits cap how much you can stake on a flagged account. Operators void bets whose terms they argue cover the trade.

How to do arbitrage betting?

The same mechanics as above, framed as a workflow: scan several bookmakers for a market whose prices imply a probability sum below one; size the stake so each bet returns the same total payout; place the bets simultaneously; settle whichever side lands. In New Zealand, the “several bookmakers” step is the constraint — TAB NZ is the only lawful option, and offshore brands are not a clean substitute.

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

TAB NZ is the only provider lawfully offering racing and sports betting to people in New Zealand since 28 June 2025, under section 74AAA of the Racing Industry Act 2020. TAB NZ trades under two brands — TAB and Betcha — which are one operator group, not two rivals. There is no licence route for a second operator and no licence register, because the law does not allow another bookmaker to exist.

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

Return equals stake multiplied by the decimal odds. Net profit, after the stake is returned, is stake multiplied by (odds minus one). A $10 stake at odds of 3.50 returns $35 in total — the $10 stake plus $25 of net profit. For a combination bet, the decimal odds of each leg multiply together into one combined price; a $5 stake on a four-leg multi with combined odds of 18.43 returns $92.14.

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

The bookmaker’s margin is the share of every matched dollar that the bookmaker keeps over the long run. It is calculated as one minus the payout share, where the payout share is one divided by the sum of one-over-each-decimal-odds across all outcomes of a market. For a two-way market priced at 1.90 on each side, the sum is 1.0526, the payout share is 0.9501, and the margin is about 4.99%. The lower the margin, the better the long-run price for the bettor — and the harder the market is to arbitrage against.

Is the strategy worth it for anyone in New Zealand, in 2026?

The honest answer is that the strategy as described — back every outcome, lock in a guaranteed return — works on the math and stops working on the structure. In New Zealand specifically, the structure is the constraint.

A bettor who wants to run arbitrage as a strategy needs:

• Several bookmakers willing to take bets at the prices they quote;
• A stake large enough to make the small percentage yield meaningful;
• A settlement environment that does not void one leg of the trade after the event;
• A legal environment that lets the bettor place bets at each bookmaker without exposing themselves to enforcement or to a withdrawal that does not arrive.

In New Zealand, only the first of those is partially satisfied, and only because offshore bookmakers exist. The other three are exactly the things the New Zealand market makes hard to deliver, and the published risk warnings on the offshore side are not theoretical. A bettor running arbs through TAB NZ alone cannot, because there is no second price. A bettor running arbs through TAB NZ and one or more offshore brands exposes themselves to a voided leg at the offshore bookmaker, a closed account, a non-arriving withdrawal, and a New Zealand regulator that has told offshore operators to withdraw. The 1% guaranteed return on capital becomes a smaller number once the probability of getting the whole stake back is factored in.

The strategy is real. The execution is where it falls apart, and in New Zealand the execution has a single biggest barrier that no offshore brand can solve.

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