Why do casinos give bonuses?

Why do casinos give bonuses? The plain answer

A casino bonus is advertising with a price tag. Instead of spending all of its marketing budget on adverts, an operator spends part of it directly on the customer, in the form of spins or matched funds. The aim is the same as any welcome discount: get you through the door, then keep you coming back.

What makes casino bonuses different from a supermarket voucher is the house edge. Every game has a built-in margin, so when you use a bonus you are, on average, giving some of it back through play. The operator isn't relying on any one player losing; it is relying on averages across thousands of customers. Our explainer on how casino bonuses work covers the basic mechanics.

Competition: why UK casinos need a welcome offer

Great Britain has a large, mature online market. The Gambling Commission's industry statistics for 2025 to 2026 (opens in a new tab) put gross gambling yield from remote casino, betting and bingo at £8.3 billion, with online slots alone at £4.8 billion, and report 25.7 million active online accounts at the end of the period.

With that many licensed sites competing for the same adults, a visible welcome bonus is one way to stand out on comparison pages and in adverts. Once one major brand offers 100 spins after a £10 bet, rivals tend to match or answer with something different, such as no wagering or daily batches.

The maths: why a bonus costs the casino less than its face value

The face value of a bonus and its real cost to the casino are two different numbers. The gap is the expected return from the play the bonus creates.

Free spins example

Coral's 100 spins at 10p have a face value of £10. If the eligible slots return 96% on average, the spins pay out about £9.60 in the long run. To get them, though, you bet £10 of your own money on slots first, and at a 4% house edge that bet costs about 40p on average. On average, then, the spins cost the operator about £9.60, minus the 40p it expects from the qualifying bet: roughly £9.20 per customer before any further play.

Match bonus example

Casumo's maximum £100 bonus needs £1,000 of wagering. At a 4% house edge, that wagering costs about £40 on average, so the operator's expected outlay falls from £100 to around £60, plus whatever it expects to earn from your own £200 deposit if you play it. Many customers lose the bonus balance before finishing wagering, which brings the average cost down further.

These are averages across many players, not predictions for you. Any single session can end far above or below. The guide to the expected value of a casino bonus shows the same sums from the player's side.

Bonuses as an investment in repeat customers

Operators don't publish how much they spend per new customer, but the logic is visible in how offers are built. A welcome bonus that brings someone back on several days, like Ladbrokes' daily spins, is designed to build a habit of visiting. Loyalty schemes and reload bonuses do the same for existing customers.

This is also why the rules around repeat incentives have tightened. Since 19 January 2026, promotions that mix products, such as 'bet on football, get casino spins', are banned, and a casino still can't increase an incentive because you hit the qualifying spend sooner. Our pages on time-based incentive rules and the mixed-product promotion ban explain both.

Why bonuses come with conditions

Conditions turn an open-ended giveaway into a predictable marketing cost. Each one limits a specific risk for the operator.

• Wagering stops the bonus being withdrawn immediately. See why bonuses have wagering.
• Expiry limits how long the operator carries the liability.
• Max bet rules, such as Casumo's £5 cap, limit the swings from large stakes.
• Winnings caps, such as 10bet's £1,000, put a ceiling on the worst case.
• Payment exclusions reflect the operator's own assessment of each method; the terms rarely explain why.
• Eligible game lists keep bonus play on games the operator has priced the offer around.

Conditions must be shown up front. Since the CMA's 2018 action, significant terms have to appear with the headline offer, not buried in general terms. Our guide to bonus terms reads the common clauses line by line.

How UK rules shape what casinos can give

Bonuses are regulated as marketing incentives under the Gambling Commission's licence conditions and codes of practice. The most important limits for players are:

The Commission's announcement of the 2026 changes (opens in a new tab) says an outright ban on wagering was considered but not adopted. Our licence conditions page and bonuses and harm indicators page go deeper.

Does higher gambling duty change why casinos give bonuses?

Remote gaming duty, paid by operators on their gaming profits, rose from 21% to 40% on 1 April 2026. A statutory levy also funds research, prevention and treatment. Operators haven't said publicly how these costs affect bonus budgets, so it is too early to state the effect as fact. What is clear is that bonuses remain a cost that has to be justified by the play they bring. For players, winnings are not taxed in the UK; see can bonus winnings be taxed.

Myths about why casinos give bonuses

For the question of fairness, see are casino bonuses rigged and our bonus myths guide.

What this means for you as a player

1. Treat a bonus as a discount on entertainment you had already planned, not a reason to play.
2. Work out the value: spins × stake, or bonus minus expected wagering cost.
3. Read the significant terms: method, minimum, wagering, expiry, max bet and caps.
4. Set a deposit limit before your first deposit; you will be prompted to anyway.
5. Turn off marketing you don't want; you can opt out by product and channel.
6. Walk away when the budget is gone, whatever is left of the bonus.

If you'd rather not receive offers at all, our guide on how to opt out of bonuses shows how. The questions hub collects related answers.

When bonuses stop, and why that matters

Because bonuses are designed to encourage play, the rules require operators to switch them off for people at risk. If you notice that offers are pulling you into gambling more than you want, use a time-out, ask the casino to stop marketing, or register with GAMSTOP. The NHS gambling support page (opens in a new tab) and the National Gambling Helpline on 0808 8020 133 are good starting points; our safer gambling page lists more.

Partner offers seen through the business lens

Knowing why casinos give bonuses helps you pick one whose conditions suit how you already play. All offers are 18+, for new customers, and terms apply.

• Coral: deposit and bet £10 on slots for 100 free spins at 10p on selected games, accept within 48 hours, valid 7 days, no wagering on winnings. Excludes PayPal, Skrill, Neteller, Paysafe, prepaid and certain debit cards.
• Ladbrokes: deposit and spend £10 on slots for 50 free spins a day for 10 days (up to 500 at 10p), claim before 23:59 daily, valid 7 days, no wagering. Excludes PayPal, Skrill, Neteller, Paysafe, Moneybookers and prepaid cards.
• PlayOJO: £10+ first deposit for 80 free spins on Big Bass Bonanza at 10p, no wagering, winnings paid in cash; not in Northern Ireland.

Coral and Ladbrokes share an operator, so check the terms if you hold an account with either.

18+. Gambling should be entertainment that costs money, not a way to make it. Decide a budget before you play: set a budget. Free, confidential help: National Gambling Helpline 0808 8020 133.