Online Slots Bonuses: How to Work Out What One Costs

What Changed on 19 January 2026

The Gambling Commission's response to its autumn 2023 consultation on socially responsible incentives sets a cap on wagering requirements. Licensees must not “Apply wagering requirements, which requires a customer to play through bonus funds, over a maximum of 10 times.” The Commission's reasoning is recorded alongside it: “We recommend proceeding with Option B, to implement a maximum of up to 10 times wagering requirements within incentives.”, and “This means that any wagering requirements attached to incentives (such as bonuses) must not exceed 10 times the incentive amount.” The requirement is dated on the page itself: “This requirement will come into force on 19 January 2026.” It did, and it is now enacted: the cap sits in the Licence Conditions and Codes of Practice at social responsibility code provision 5.1.1, paragraph 3(a). The Commission's own definition of the mechanic is “A wagering requirement is where a customer is required to make wagers totalling a particular value for funds to become withdrawable.”

The cap was set against what the market had been doing. In the consultation response published on 26 March 2025, one of the reasons the Commission gives for choosing ten rather than one or five is that “a limit of 10 times will take out extreme levels as some licensees currently apply up to 60 times wagering requirements.” A second requirement, in force on the same date, bans a licensee from including in an incentive “more than one type of gambling product (betting, casino, bingo, and lottery) within an incentive.” The Commission states the intent: “We confirm that the aim of this proposal is to ban the mixing of products within an individual incentive or promotional offer, where terms are linked and shared.”

Game Weighting, in the Commission's Own Words

A wagering requirement is not met at the same rate by every game. The consultation response records the mechanic: “A few respondents commented that the impact of a cap on wagering requirements will also need to consider the Game Contribution Restrictions, also referred to as Weighting, which is applied to control how quickly a customer can play through a game.” It gives an example: “For example, a bonus might carry 10 times wagering requirements on all slots but will be weighted at 50 percent for blackjack and 30 percent for roulette.” And it works the arithmetic through: “This means that if you have a £100 bonus with 10 times wagering requirement and you decide to play a casino game like roulette with a 30 percent weighting, each £1 you wager contributes 30 pence towards the wagering requirement.”

The Commission decided not to regulate weighting at this point, while saying what it expects of the terms: “From the current evidence, we do not think it is necessary to review rules on weightings attached to wagering requirements at this time.”, and “We would expect any terms and conditions, including those relating to wagering requirements, to be clear and transparent to consumers.” The underlying licence duty is named on the same page: “Under Licence Condition 7.1.1 (Fair and open terms and practices), licensees are required to ensure terms and practices are fair, transparent, and not misleading.”

The Arithmetic of Playing Through a Requirement

What a wagering requirement counts is turnover. The Commission's live return to player monitoring guidance, last updated on 29 January 2025, defines turnover as “The total of all stakes made on the game, this will include reinvested winnings awarded during play.” Against that total, “The GGY of a game will be the turnover minus win.” The Commission's consumer guidance defines the share a game is designed to retain: “This is called the house edge, and it gives a measure of the percentage that a casino would expect to keep, on average, from each hand or spin, given normal patterns of play.”

So the two quantities a reader needs are on the page in front of them and in the game's own rules. The requirement fixes how much must be staked — at most ten times the incentive from 19 January 2026, and more than that in staked turnover wherever a weighting below 100 percent applies, since at a 30 percent weighting “each £1 you wager contributes 30 pence towards the wagering requirement.” The game fixes the expected share of that turnover the operator retains. The Commission is explicit that this is an average over volume and not a session forecast: “The %RTP is an average achieved over a significant number of game plays and not each time the gaming machine is played.”, and “If a gaming machine displays an 85% RTP, you should not expect to win an average of 85 pence for every £1 you stake during a playing session.” An individual outcome is not predictable from either number, and neither number makes an offer a source of income.

What the Terms Have to Make Clear

The Commission's consumer page on free offers and bonuses, last updated on 12 November 2024, opens with the plain fact that “Many betting sites and apps offer free incentives.” and that “These can include things like free spins or bonus money when you open a new account.” It then lists what companies should do, including “make it clear if you’re playing with your own money or bonus funds which are subject to more restrictions, for example a bonus amount added to your account when you sign up” and “be clear about any restrictions on how you can play with bonus funds, such as restrictions on the size of bets.” It also lists what they should not do, including “change the details of a free bet once you’ve accepted the deal and started playing.”

Whether players read the terms is a separate question, and the Commission's own safer gambling page, last updated on 16 September 2020, puts a figure on it: “Almost 80% of gamblers do not read the terms and conditions on the websites they gamble on.” Its advice follows from that: “You should take the time to read the terms and conditions, making sure you are aware of exactly what you are gambling on, restrictions, promotions or bonus offers.”

What the Commission's Research Found About Incentives

The Commission published data on consumer experiences and attitudes to free bets and bonuses on 15 February 2022, drawn from questions put to gamblers in June 2021. Its key facts record reach: “Over two thirds of gamblers had received some form of incentive in the last 12 months, with the most common being free bets/spins and sign up offers, and the most common way of receiving them being through email.” and “Among those that had received incentives in the last 12 months, almost three quarters had received them for online betting (73%).” On effect, the finding is split: “Most respondents felt that their gambling is not influenced by receiving incentives (61%), however 31% of respondents agreed that receiving free bets/bonus offers encouraged them to gamble more than they wanted to.” Separately, in the consultation record, “Respondents suggested that customers are unable to estimate the true economic value of an offer and very high wagering requirements lead to lower comprehension of how much is needed to bet when taking up an incentive.”

What a Slots Bonus Actually Gives You

Not every slots bonus can be withdrawn. Many offers give credit that may only be used to place bets: anything won with it can be withdrawn, but the credit itself cannot. Which restrictions apply is something a regulator requires to be written down — Pennsylvania's interactive gaming rules list, among the terms an operator must file, "Any restrictions on the withdrawal of funds." — so the answer for a given offer is in its terms rather than in a general rule.

An operator does not mind whether a player wins or loses while a wagering requirement is being met: if a player wins, the credit is still released. What the operator relies on is the advantage built into the games over the volume of play the requirement demands. How much that advantage takes depends on the turnover the requirement calls for, and the page works one case out below; this page states no figure for what a typical player finishes a requirement down, because no published source gives one.

Working Out What a Requirement Costs

Suppose a requirement calls for $20,000 of wagers on a game with a 5% house edge. That turnover costs about $1,000 on average, against a $100 bonus — the requirement is worth far more than the credit it releases.

That is an extreme case, and in Great Britain it is now outside the cap quoted above: $20,000 of wagers against $100 of bonus credit is two hundred times the bonus funds, where the Commission's code allows a maximum of ten. It still shows the shape of the calculation to make about any particular offer, and the cap applies only to licensees in Great Britain.

The same applies to any bonus. Every offer has an expected value that follows from three things: the wagering requirement, the amount of credit, and the house edge of the games the requirement may be cleared on.

In practice that means reading the terms to find the wagering requirement and the base it is applied to, and reading the game’s own published return figure before staking.

The phrase “on average” carries the weight there. A house edge is the long-term expectation, and in any given session a player will most likely win or lose more than that amount. The longer the play goes on, the closer the actual result comes to the expectation.

Whatever the conclusion on a particular offer, the things to do are the same: read the terms, understand the odds on the game the requirement has to be met on, and play within a bankroll set in advance.