The Real Cost of Existing-Customer Offers at UK Bookmakers

Updated October 2026

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Current as of 27 October 2026 against the Gambling Commission’s public register and the operators’ own published terms.

The Ten Operators Reviewed and What Sets Each Apart

A shortlist is useful only if the order on it tells the reader something. Here it tells them this: the ten bookmakers below are all licensed by the Gambling Commission for remote betting in Great Britain, and they are arranged not by “best” but by the kind of existing-customer offer each one leans on. The Coral headline, the Spreadex two-sided product, the Smarkets exchange-through-SBK and the Sporting Index spread book all sit on different mechanics, and lumping them under one “best free bet” banner would mislead anyone comparing them.

The licences above are the things to verify before depositing a penny, and the section on legality walks through how to do that. The right-hand column is what each operator prints on its own pages, and is the only place the rest of this page draws the headline figures from.

How the comparison is judged

A free bet that pays the stake back is worth more than the same headline amount in a token that does not. An offer at minimum odds of 1.5 needs more turnover per pound of value than one at 2.0. A 7-day expiry costs a casual bettor more than a 30-day one. None of this is in the headline, all of it is in the terms, and the cost column is built from the terms rather than the marketing.

The single most important rule that applies to every offer in the table, and to every other welcome and existing-customer promotion offered by a GB-licensed bookmaker, is the one the Commission brought in on 19 January 2026: a wagering requirement on a bonus may not exceed 10x, and a mixed-product promotion that asks the punter to gamble on two or more product types (betting and casino, for example) is banned. That second rule is the reason BetTom’s headline is split in two, and the reason the rest of this page is alert to the way an offer tries to pull the punter across product lines.

What the rest of this page covers

First, the fundamentals: what an existing-customer offer actually is, how it differs from a sign-up offer, and why the marketing language tends to dress the smaller figure as the larger one. Then the legal frame, because the 10x cap and the GAMSTOP obligation shape every offer in the table. Then the safer-gambling tools that any GB-licensed operator must surface, since the offer is only ever as good as the controls around it. Then the mechanics of bonuses and free bets themselves, and a worked example of what Coral’s £40-in-free-bets headline costs in turnover. Finally, ten short operator reviews, each ending on a verdict that answers a different question.

Fundamentals: What an “Existing-Customer Offer” Actually Is

The phrase covers everything a licensed bookmaker offers to a customer who has already signed up and passed identity checks: free bets tied to a specific match, acca insurances that refund a stake when one leg lets the rest down, odds boosts on selected markets, profit boosts on accumulators, loyalty schemes that pay a free bet for every five settled accas, prize draws, and the daily-or-weekly odds enhancements that pop up on the home page. Welcome offers are a strict subset: they exist for new customers only, paid once on the first qualifying bet.

Three things unite everything under that banner. The first is that the headline figure is rarely what the punter ends up with. A £20 free bet at minimum odds of 1.5 and a 7-day expiry, with the stake not returned, has an average monetary value well below £20, and the difference is what the book’s margin and the qualifying rules take out. The second is that the terms travel with the token. Minimum odds, expiry, eligible markets, maximum payout, payment-method exclusions and the wagering multiple (where one applies) are the offer; the £40 is a label on the box. The third is that a Commission-licensed bookmaker is bound to spell those terms out before the punter opts in, and the same terms that protect the punter in a complaint also bind them at the betting slip.

The two product shapes a reader is most likely to meet are the free bet and the price boost. A free bet is a token that replaces real money at the slip: pick a selection, the stake is taken from the token, and on a win the winnings are paid but the stake is not. A price boost is a temporary enhancement of the odds on a named market; the stake is paid in real money, the bet settles like any other, and the difference between the boosted price and the ordinary one is the value. A third shape, acca insurance, refunds the stake as a free bet if exactly one leg of a qualifying accumulator loses. None of these is “free” in the everyday sense; each has a price paid in turnover, time and lost margin.

The single most important distinction is between an offer with a wagering requirement and one without. The Commission’s 10x cap applies only where there is one. A welcome offer that pays a free bet with no rollover (Coral’s, for example) is not caught by the cap because there is nothing to cap; the cap bites the moment a bonus must be turned over a number of times before withdrawal.

The Legal Frame: What a Gambling Commission Licence Buys

A GB-licensed bookmaker is one that appears on the Commission’s public register, and the register is the only place that proves it. Anyone can build a website that says “licensed and regulated in Great Britain” in the footer; the test is whether the licence number in the footer resolves to a real entry when entered into the register’s search box, alongside the business name, the trading name and the domain. The register can be searched by any of those fields and returns the licence number, the categories of licence held, the licence holder and the trading names covered. A search of “Coral” returns the entry for LC International Limited; a search of “Kalooki Sportsbook” returns the entry for Kalooki Sportsbook Limited.

Ten things the licence buys the punter, and that no offshore alternative can match:

• Independent dispute resolution through an ADR body approved by the Commission if a complaint cannot be settled with the operator.
• Mandatory participation in GAMSTOP, the national multi-operator self-exclusion scheme, with minimum periods of six months, one year, five years, or five years with auto-renewal.
• Identity verification before the first deposit (since 7 May 2019), so an account is never anonymous even before a free bet is credited.
• A financial vulnerability check from the moment a customer’s net deposits cross £150 in a rolling 30 days (in force since 28 February 2025), based on public records, not on income.
• A ban on credit-card deposits (since 14 April 2020), including credit-card-funded e-wallet top-ups.
• A bonus wagering cap of 10x, in force since 19 January 2026.
• A ban on mixed-product promotions, in force since 19 January 2026.
• Marketing under the CAP and BCAP Codes, with the ASA as backstop, and the LCCP social responsibility code on top.
• A duty to offer deposit limits on a fixed time frame, with phased implementation from 31 October 2025.
• A route to GamCare, the National Gambling Helpline, GambleAware and the NHS gambling clinics for anyone whose betting has tipped into harm.

The single thing it does not buy is a tax-free win for a professional gambler: that question belongs to HMRC, and the general position for a recreational punter is that betting winnings are not taxed in Great Britain. General Betting Duty is the operator’s tax on gross profits, and the player does not pay it.

A licence in another jurisdiction is not a substitute. A Curaçao, Malta or Gibraltar registration is irrelevant at the point of consumption: under the Gambling (Licensing and Advertising) Act 2014, an operator whose remote facilities are used in Great Britain needs a Commission licence wherever it is based. The act makes providing unlicensed gambling facilities in Great Britain an offence under section 33 of the Gambling Act 2005. There is no equivalent offence aimed at the customer who bets on an unlicensed site, but the practical cost is the loss of every protection above: no GAMSTOP coverage, no Commission complaints route, no British consumer redress if funds are withheld, and no obligation on the operator to honour the 10x cap or the £150 vulnerability check.

A separate point on age and identity: minimum age is 18, and the verification that lets a customer deposit is the same one that lets a customer claim a free bet. There is no anonymous play at a licensed site, and source-of-funds questions at higher spend are normal under the money-laundering rules, not a sign of trouble.

Safer Gambling: The Tools Every Licensed Operator Must Surface

A bonus is only ever as good as the controls around it, and the controls at a licensed bookmaker now extend well beyond the deposit-limit toggle. The list below is the set a punter should be able to reach from the account menu in two clicks, and the one a customer-services chat should be able to walk through in plain English.

• Deposit limits on a fixed time frame. Daily, weekly or monthly ceilings on what can be paid in. These are customer-set, not state-set: there is no GB statutory deposit ceiling, and the limits on offer are the punter’s own choice, recorded in pounds and enforced by the operator. The Commission’s phased rules (RTS 12) on the operator’s defaults have applied in part since 31 October 2025, with a second phase postponed to 30 September 2026.
• Time-out and self-exclusion. A short cooling-off period of 24 hours to several weeks, or a longer GAMSTOP registration of six months, one year, five years, or five years with auto-renewal. After the minimum GAMSTOP period the exclusion stays in place for seven more years unless the customer asks for it to be lifted. GAMSTOP is online-only; a separate service covers betting shops.
• Reality checks and session timers. Pop-ups or logs that interrupt play at a chosen interval, set by the customer.
• Activity statements. A downloadable record of deposits, withdrawals, bets settled, free bets credited and net position over a chosen window.
• Financial vulnerability markers. The Commission’s public-record check applies when net deposits cross £150 in a rolling 30 days, in force since 28 February 2025. It is a marker on the account, not a denial of service.
• Self-referral routes to help. Direct links to GamCare and the National Gambling Helpline, the NHS gambling clinics, GambleAware and Gamblers Anonymous from the safer-gambling page and the footer.

Financial risk assessments of the kind the press calls “affordability checks” are a separate, staged plan published by the Commission on 7 July 2026, with no start date. They are announced, not in force, and a bookmaker asking for payslips or bank statements today is acting on its own licence duties and on money-laundering rules, not on a Commission rule that has been switched on.

The frame for all of this is the LCCP’s social responsibility code, which every Commission licensee is bound by. A bookmaker that fails the safer-gambling test on its own site loses more than a fine: it can lose the licence, and with it the right to take a single bet from a single GB customer. The frame is the reason the safer-gambling page is more than a marketing afterthought, and the reason an offer with a 7-day expiry and a minimum-odds clause that pushes the punter into unfamiliar markets is the kind of thing a thoughtful customer reads twice before opting in.

How Bonuses and Free Bets Are Built

The free bet

A free bet is the workhorse offer of the GB market. The mechanics are simple. The bookmaker credits a token to the account, usually after a qualifying bet is settled; the punter picks a selection at or above the stated minimum odds; the stake is taken from the token; and on a win the winnings land in cash, with the stake not returned. The monetary value of the token, in plain money, depends on the odds the punter picks and on the margin the bookmaker keeps on that market: a £10 free bet at decimal odds 3.00 on a market with a 5% margin pays on average about £9.50 of profit over many such bets, not the £20 the winnings headline might suggest.

Two clauses matter most. The first is the minimum odds: at 1.5 the punter is restricted to the heavily-favoured end of the market, where the margin is highest; at 2.0 the same token is worth more on average because the punter can pick a market with a tighter spread. The second is the expiry: a 7-day window forces a placement on the first eligible weekend, when the bookmaker’s in-play product is at its weakest and the headline match is the one the boost is on.

The wagering requirement

A wagering requirement (sometimes called a rollover) is the multiplier the bookmaker applies to a bonus before it can be withdrawn. A £10 bonus with a 10x wagering requirement has to be turned into £100 of settled bets before any winnings can be taken out, and only bets at or above the minimum price count. The Commission’s 10x cap is the maximum permitted at a licensed operator since 19 January 2026. An offer that asks for 20x, 30x or 50x is not a licensed offer in Great Britain, and the punter who sees one is looking at an offshore brand.

The price boost

A price boost is a temporary enhancement of the odds on a named market, paid in real money. The stake is the punter’s, the bet settles like any other, and the difference between the boosted price and the ordinary one is the value. A boost from 5/1 to 10/1 on a single selection is worth roughly an extra four units of profit per unit staked, with no rollover and no stake-not-returned clause. The cap on a boost is the stake the punter is allowed to place: William Hill’s Football Acca Boost, for example, runs a maximum boost of £10,000 per online bet until 30 May 2027.

The acca insurance and the profit boost

Acca insurance refunds the stake as a free bet if exactly one leg of a qualifying accumulator loses. BoyleSports’ version requires a £5 minimum stake, minimum odds of 1/2 and a maximum refund of £20 as a free bet that expires in 7 days, with all bets placed and settled on the same day. A profit boost (Spreadex calls them Acca Boosts, Copybet calls it an Acca Booster) is a percentage enhancement of the winnings on accumulators of a stated minimum number of legs, paid in cash.

The mixed-product trap

The most common structural abuse, and the one the Commission’s 19 January 2026 rules were written to stop, is the offer that asks the punter to gamble on two or more product types. “Bet £10 on football to get free spins” is the textbook example: the betting leg is qualified, the casino leg is qualified, and the offer uses one to drive business into the other. BetTom’s headline — 50% back as a free bet up to £50, with a matching 50% back up to £50 as free slot funds — sits in exactly this shape, which is why a Commission-licensed operator offering it now has to structure the two halves in a way that does not condition one on the other. The cap is the floor, not the ceiling, and an offer that pulls a punter into a market they did not want to be in is a poor offer whatever its face value.

The 10x cap in practice

Under the cap, a £10 bonus can require at most £100 of qualifying bets. A £50 bonus, at most £500. A £200 bonus, at most £2,000. The cap is per-bonus, not per-customer, and the punter is entitled to assume that no offer at a licensed site exceeds it. The cap does not, on the face of the rules the Commission has published, apply to free bets that have no wagering condition at all, and the question of whether it does is the kind of grey area the terms page ought to settle.

What Coral’s £40-in-free-bets headline actually costs

Coral’s sports welcome offer — “Get £40 in Free Bets when you bet £20” — has no wagering condition on the £40 itself. The qualifying bet is £20 at minimum odds of 2.0 (1/1), settled before the free bets are credited, with the £40 paid as free bet tokens within 7 days and expiring 7 days after issue, for new GB customers using a debit card or instant bank transfer. The monetary value of the £40, on the assumption that the punter uses the full amount on a market with a 5% margin and at average decimal odds of 3.00, sits in the band of about £19 to £20 of expected profit over many uses, never £40. The £40 is the headline; the value is what the headline’s terms leave after the margin and the no-stake-returned clause have done their work.

If Coral’s offer were instead a bonus with a wagering requirement — the 10x cap shapes the upper bound — the picture changes. A £40 bonus with a 10x rollover means £400 of qualifying bets at minimum odds 2.0 to clear. At a stake of £20 a bet, that is 20 settled bets. The expected cost of clearing, on a market with a 5% margin, is in the band of about £20 over the clearing period, which is half the headline value. The headline is still £40 in the punter’s account; the net cost of converting it into withdrawable cash is the £20 of margin paid on the way through. That is the gap between the offer and the offer’s worth, and it is the gap the rest of this page comes back to.

The Ten Operators, Reviewed

Each review covers the offer, the mechanics that make it work, and a verdict on who it suits. The verdicts answer different questions on purpose: a free-bet headline is a different question from a spread-book welcome, and a verdict that says “for the punter who wants X” ten times over is one sentence written ten times.

Coral — the £40-in-free-bets template

The headline is the same one the page uses as its worked example: £40 in free bets when £20 is staked at minimum odds 2.0 (1/1), credited within 7 days, expiring 7 days after issue, debit card or instant bank transfer only. The free bets are split across tokens, each usable on a different sport or market, and the daily free Reward Shaker, the Odds Booster on hundreds of markets and the free-to-play games such as Football Super Series are the existing-customer side of the offering.

The mechanics are the textbook: qualifying bet settled, tokens credited, stake not returned. A punter who treats the £40 as £20 of value in the betting account is closer to the truth than one who treats it as £40. Coral is also the place the section on payments mentions separately: the offer is gated to debit-card or instant bank-transfer deposits, and the site lists Apple Pay, Visa, Visa Electron, Mastercard, Revolut Pay, Google Pay, TrueLayer, Earthport and Trustly among the payment options for the rest of the account. The licence is 054743-R-330863-014, held by LC International Limited, which also operates Ladbrokes under the same umbrella.

The verdict: this is the offer to copy when writing about how a free-bet welcome works in plain English, and the one to read first before any other on the list. It is the cost benchmark.

BetTom — the 50% back in two halves

BetTom’s sports welcome offer is 50% back as a free bet of up to £50, with a matching 50% back of up to £50 as free slot funds for casino play. The split is the point: the betting half is one offer, the casino half is another, and the offer’s overall value depends on whether the punter is in the market for the casino side at all. The Commission’s 19 January 2026 ban on mixed-product promotions is the rule that decides whether a structure like this can be marketed as a single headline, and the licence entry — 064959-R-339314-003, held by Bet Tom Limited — is the place to confirm the structure on the day.

The verdict: a sports-only punter is paying attention to the betting half and ignoring the casino half. For anyone who plays both, the structure is fine; for anyone who plays only one, it is a half-offer.

Dabble — the small, fast token

Dabble’s welcome is “Bet £10, Get £10 in Free Bets” on a first deposit for new customers, with minimum odds applying, a 7-day free-bet expiry and the stake not returned. The mechanics are the same as Coral’s but at a third of the size and with a faster window. The licence is 065677-R-340363-005, held by Dabble Sports UK Ltd.

The verdict: the right shape for a punter who wants to learn how a free-bet token settles without committing a large qualifying stake, and the wrong shape for a punter who wants headline value. The 7-day expiry is the binding constraint.

Sky Bet — the £30-in-three-tokens format

The £30 in free bets is credited as three £10 tokens after a £5 deposit and a first single or each-way bet of at least 5p at odds 1/1 or greater. The minimum qualifying stake is unusually low — 5p is the floor — and the £30 is split rather than paid as a single token. The licence is 067370-R-341330-005, held by SBG Sports Limited, the same Sky-owned entity behind Sky Casino and Sky Vegas.

The verdict: a useful shape for a punter who wants three separate shots at three different markets rather than one shot at one, and the right offer to read before judging whether splitting a free-bet credit across tokens costs or gains the punter anything. On three £10 tokens the stake-not-returned clause applies three times.

Kalooki Sportsbook — the instant-withdrawal, BOG-rail, in-play book

Kalooki advertises instant withdrawals by bank transfer within minutes, Best Odds Guaranteed on UK and Irish horse racing, in-play betting, daily boosts and extra-place races. The gambling Commission’s public register carries the licence 057730-R-333396-005, held by Kalooki Sportsbook Limited, and the operator is a GAMSTOP member. The offering is a small-field racing-and-football book rather than a 30-sport generalist, and the existing-customer offers lean on the racing side: extra places on the big meetings, BOG as standard, daily boosts on the weekend cards.

The verdict: the right book for a punter whose betting is built around UK and Irish racing and who values payout speed over market depth. A punter who needs 80 markets on a Champions League group game is looking at a different book.

Sporting Index — the spread book with a fixed-odds welcome

Sporting Index runs as a spread book on sports indices, and the welcome offer is the bridge from fixed odds to spread. A £10 fixed-odds bet at minimum odds 1/2 unlocks three £10 fixed-odds free bets, three £5 Total Goals spread bets, three £5 Winning Favourites spread bets and a £1 Race Index spread bet, with the qualifying bet ineligible for in-play or early cash-out. The licence is 027343-R-308898-011, held by Sporting Index Limited, and the operator is part of the same group as Spreadex, which runs the FCA-regulated financial side.

The verdict: the offer is a sampler rather than a headline, and the right reader is a punter who wants to try spread betting without committing a large fixed-odds stake. Spread betting losses can exceed deposits, and the FCA-regulated Spreadex side runs on a different licence from the Gambling Commission side: two licences, two rule books, one group.

Copybet — the cash-bonus acca book

Copybet’s Acca Booster pays up to 100% cash on accas of at least 3 selections, and the Daily Profit Boost is up to 15%. The existing-customer side of the offer is structured around accumulators, and the cash bonus is paid on the winnings rather than as a free-bet token. The licence is 053774-R-330743-010, held by Copybet UK Limited.

The verdict: a book for the acca punter who would rather take a cash bonus on a winning bet than a free bet on a losing one, and a book to read carefully because the cash bonus is paid on a profit boost rather than as a stake replacement. The stake is paid in real money and returned with the winnings; the boost is the extra.

QuinnBet — the 7-day free bet with a 50/1 ceiling

QuinnBet’s free bets are valid for 7 days from credit, usable on any market at odds 1/2 (1.5) or greater, with maximum odds of 50/1, and accumulators are allowed but Trixies, Patents and Yankees are not. The 50/1 ceiling is the rule that decides whether a long-odds selection can be used: a price-boosted outsider at 100/1 is not a qualifying selection. The licence is 061011-R-335683-004, held by QuinnBet (Gibraltar) Limited.

The verdict: a tightly-specified book on the free-bet side, and the right place to confirm what the betting platform will and will not let a token be used on. A punter with a 33/1 fancy needs to know the ceiling in advance.

10bet — the 100%-up-to-£50 betting bonus

10bet advertises a 100% up to £50 betting bonus for UK sign-ups, with daily free bets and free spins on the casino side. The bonus is a matched deposit, which puts it inside the Commission’s 10x cap territory: a £50 bonus at 10x is £500 of qualifying bets, and the cleared value depends on the minimum odds the terms require. The licence is 043173-R-322899-023, held by Blue Star Planet Limited.

The verdict: a bonus shape rather than a free-bet shape, and the right page to read for how a 10x cap is built into the small print. The headline is 100%, but the £50 ceiling and the rollover do the arithmetic.

Smarkets (SBK) — the exchange book with a sportsbook welcome

Smarkets also runs the SBK sportsbook, whose UK welcome offer is a £20 first deposit and £20 bet at minimum odds 3.0 for £60 in free bets within 48 hours, with Cash Out, Bet Builder and live horse-racing streaming. The minimum odds 3.0 is the highest of any welcome in the table, and the £60 in free bets is the largest headline for the smallest qualifying stake. The licence is 039173-R-319366-011, held by Smarkets (Malta) Limited, and the licence category is remote betting intermediary — the exchange side of the business, with SBK as the fixed-odds front.

The verdict: the offer to read for the trade between a high minimum-odds requirement and a large free-bet headline, and the right book for a punter who is comfortable at decimal odds 3.0 and above. The exchange side of the business is a separate product with separate mechanics, and the welcome is on the sportsbook side only.

Frequently Asked Questions

What is the maximum wagering requirement on a betting bonus in Great Britain?

A 10x cap. Since 19 January 2026 the Gambling Commission has barred any GB-licensed operator from setting a wagering requirement on a bonus above 10x the bonus amount, and an offer that requires gambling on two or more product types (such as betting and casino together) is banned. The cap applies to bonuses with a rollover; free bets with no wagering condition sit in a less settled area.

What do minimum odds and the wagering requirement mean in a sign-up offer?

The minimum odds are the floor below which a qualifying bet does not count toward the offer, and the wagering requirement is the multiple of the bonus that has to be turned into settled bets before any winnings can be withdrawn. A £20 welcome at minimum odds 2.0 and a 5x wagering requirement means a £20 bet at evens or longer, settled, and then £100 of further bets at the same minimum before the bonus converts to cash. Check the operator’s own terms for the exact numbers and any market restrictions.

Why is the stake of a free bet not paid back with the winnings?

The free bet is a token that replaces real money at the slip: the stake is taken from the token, and on a win only the profit is paid in cash. The clause protects the bookmaker from paying out twice on the same promotion, and it is the reason a £10 free bet is worth less than £10 of real money at the same odds. A punter who uses a free bet on a long-odds selection maximises the profit on the win; a punter who uses it on a short-odds selection gets the smallest realistic payout.

Can a bet on sport be tied to a casino bonus under the Commission’s promotion rules?

No, not as a single offer. Since 19 January 2026 mixed-product promotions — those that require the punter to gamble on two or more product types, for example betting plus casino, bingo or lottery — are banned at GB-licensed operators. A sportsbook can still run a sports-only offer and a casino-only offer side by side, and a customer can claim both, but the marketing cannot condition one on the other and the small print cannot require both to clear the same bonus.

How can it be checked that a bookmaker holds a Gambling Commission licence?

The Commission’s public register lets a punter search by business name, trading name, domain or account number. The register returns the licence number, the licence categories, the licence holder and the trading names covered. A licence number printed in a footer that does not resolve to a register entry is not a licence, and a domain that ends in .co.uk is no proof at all: licensed operators use .com as well as .co.uk. Searching the domain and the brand name is the minimum check; reading the licence categories against the markets the punter wants to bet on is the next one.

Are betting winnings taxed in Great Britain, and who pays General Betting Duty?

A recreational punter pays no tax on betting winnings in Great Britain, and that is general information rather than personal tax advice: a professional gambler should ask HMRC or a tax adviser. General Betting Duty is the operator’s tax on gross profits, currently 15%, with a new remote rate of 25% applying from 1 April 2027 on remote bets outside UK horse racing, betting terminals and pool betting. The player does not pay duty, and whether the operator passes duty on through odds is not established.

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