When evoke published its half year numbers on 12th August, the headline was a £46m rise in gaming duties. The more revealing line sat underneath it: more than half of that hit had been offset through “lower but more effective marketing investment” and “improved promotional efficiency”. The rest of the sector is hunting for the same savings in every corner of the cost base, right down to the payment stack, where an Edinburgh payments orchestration firm that counts Betfred among its customers raised £10m in June.
Promotional efficiency is a polite way of describing a smaller welcome offer. Since 19 January, the Gambling Commission’s cap on wagering requirements has turned every casino bonus into a far more expensive line in an operator’s acquisition budget. The market has not dried up. Freebets.com, which tracks UK welcome offers, counted £4,196 of headline bonus value across 79 casino sites on 9th October, an average of roughly £53 per site.
The arithmetic behind ten times
Before January there was no ceiling. The regulator’s own example of the old model was a £10 bonus carrying a 50x requirement, which forced £500 of play before any winnings could be withdrawn. Research by the Behavioural Insights Team (BIT) for the Commission’s consultation treated 30x as the level most commonly used by UK operators, and plenty of sites ran higher.
Take a £100 bonus at 35x. A customer had to stake £3,500 to release it. At 10x the same bonus needs £1,000, a 71% fall in required turnover.
That gap matters because of what happens to the money while it is being played through. On a slot paying back 96%, the house expects to keep about 4p of every pound staked. At 35x, the expected take while the customer clears the bonus is around £140, more than the bonus itself, so on average the operator could expect to recover the full £100. At 10x the expected take falls to about £40, leaving roughly £60 of every £100 likely to end up with the customer.
Those figures are simplified. Game weightings, maximum bet rules, expiry windows and caps on bonus winnings all pull some of the value back, which is why those terms now carry far more weight in offer design than the headline multiple. The direction is not in doubt, though. A bonus that used to pay for itself has become a real cash cost per customer.
Where the bill lands for operators
The first cost is engineering. Bonus wallets and promotion engines all had to be rebuilt for January, alongside a second rule that banned offers mixing products. Commission guidance published in December spelled out that “Bet £5 and get 20 free spins” is no longer allowed, which closed one of the cheapest routes for moving sportsbook customers across to casino.
The second is the acquisition maths. If each new depositor now costs real money through the bonus, the payback period on that customer stretches, and marketing teams have to justify spend on retention rather than on headline sign up numbers. The tax backdrop makes that harder. Remote Gaming Duty rose from 21% to 40% on 1 April, so every pound of gross gaming revenue a bonus generates is worth less to the operator once the Treasury has taken its share.
During consultation, much of the industry argued that anything below 10x would make offers financially unviable. One assumption behind that warning has not held up. The BIT trial, run with 4,012 UK adults in December 2023, found no difference in rates of play between offers at 1x, 5x, 10x and 30x. Lower wagering did not pull in more players. For a finance director, that means the bonus got more expensive without bringing any extra volume with it.
What customers get in return
The case for the cap rests on comprehension. The same trial found that seven in ten people could not work out how much they would have to bet to meet a wagering requirement, and three in five did not realise one applied at all after seeing a realistic advert and sign up page.
A second rule landed on 30 September. Operators must now offer gross deposit limits on fixed time frames running from 24 hours up to one month, and only that type of limit may be called a “deposit limit”. Any other financial limit can sit alongside it, but with no greater prominence. The change closes a gap in which a limit that netted off withdrawals could look tighter than the amount a customer could actually lose.
Spending patterns behind the rules
The pressure for tighter controls comes from transaction data as much as from policy. Nationwide recorded £224.6m of customer gambling spend in January 2026, up 9% on a year earlier, with transaction volumes up 7%. Its research among 2,000 UK gamblers found that the top 10% of spenders put an average of £745 a month into gambling.
Those heavy spenders are the customers that deposit limits and slimmer bonuses are aimed at, and they are also where a large share of operator revenue sits. Online casino is still the fastest growing corner of the market. The Commission’s annual statistics put online casino gross gambling yield at £5.7bn in the year to March 2026, up 14.8%, inside a remote sector worth £8.3bn.
The direction for 2027
Nothing in the pipeline points to a loosening. Remote betting duty moves to 25% in April 2027 under changes the government has already published, and the Budget on 28 October will show whether the Treasury has more in mind for the sector. The consultation evidence also left a door open. BIT recommended capping bonus wagering at 1x, not 10x, and that paper remains on the record for whoever reviews the rules next.
For operators, the useful conclusion is an uncomfortable one. The headline bonus is no longer a cheap marketing asset to be scaled up whenever growth slows. It is a cost per customer that has to earn its place in the budget like any other, and the firms still treating it as free money for acquisition will see the difference in their margins first.