Online slots now earn £4.79bn a year in Britain: why that makes free spins the bonus you see most
If almost every welcome offer you see is free spins, there is a reason. Official statistics published on 17 September show that online casino, and slots in particular, is now the biggest and fastest-growing part of British gambling. Here are the figures and what they mean for the bonuses on offer.
By the Top Casino Bonus team. Published .
Key points
- British gambling yield reached £17,456m in the year to March 2026, up 4.4%.
- Remote casino is the largest sector, at 32.7% of the total.
- Online casino grew 14.8%, with slots alone yielding £4,790m.
- Online betting yield fell 6.6%, with football down £165m.
- Operators fell 1.1% to 2,154, holding licences for 3,097 activities.
- Total yield
- £17,456m, up 4.4%
- Largest sector
- Remote casino, 32.7%
- Online casino growth
- 14.8%
- Online slots yield
- £4,790m
- Online betting
- Down 6.6%
- Published
- 17 September 2026
The figures
| Measure | Figure |
|---|---|
| Total gross gambling yield | £17,456m (up 4.4%) |
| Remote casino share of total | 32.7% |
| Online casino growth | 14.8% |
| Online slots yield | £4,790m |
| Online betting yield | Down 6.6% (football down £165m) |
| Licensed operators | 2,154 (down 1.1%) |
Gross gambling yield is what players stake minus what they win: the operators’ revenue before costs and duty.
Why this means free spins
Slots are where operators make most of their online casino revenue, so welcome offers are built to introduce you to slots. Free spins are cheap to give in a fixed amount (100 spins at 10p is £10 of play), simple to advertise, and since the 10x wagering cap, wager-free spins have become the cleanest offer to market. Three of our five partners now lead with wager-free spins. See free spins UK and what free spins are worth.
The maths behind a slots bonus
A slot with a 96% RTP returns, on average, 96p of every £1 staked over the long run, so 100 spins at 10p (£10 staked) have an expected return of about £9.60, with wide swings either way. Our guides to free spins maths and high RTP slots for bonuses go further, and the calculator handles bonus money.
18+. Gambling should be entertainment, never a way to make money. Free, confidential help 24/7: National Gambling Helpline 0808 8020 133, or see our safer gambling page.
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Our top three casino bonuses this month
- #1
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- #2
Ladbrokes Casino · ★ 4.2/5Play £10 on slots, get up to 500 free spinsClaim at Ladbrokes (advert, opens in a new tab)Significant terms: 18+. New customers only, from 14/11/25 until further notice. Certain deposit methods excluded. Deposit and spend £10+ on slots for 50 free spins a day during the first 10 days after first deposit and registration (max 500, £0.10 each, selected games, claim before 23:59 each day, valid 7 days). No wagering. Prepaid cards, PayPal, Paysafe, Neteller, Skrill and Moneybookers deposits do not qualify. Restrictions and T&Cs apply. GamCare.org.uk Read the review
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Significant terms: 18+. New UK customers (excluding Northern Ireland). First deposit only. Minimum deposit £10. 80 free spins on Big Bass Bonanza, £0.10 each. No wagering requirements; winnings paid in cash. Cannot be used with any other offer. Only available to players who arrive through the designated offer link. Full T&Cs apply. GamCare.org.uk Read the review
18+. New customers only. We may earn commission from these links. Advertiser disclosure · See all five bonuses
Frequently asked questions
How much do UK online slots earn?
£4,790m in the year to March 2026, according to Gambling Commission statistics.
What is the biggest gambling sector in Britain?
Remote casino, at 32.7% of gross gambling yield.
Why are most casino bonuses free spins?
Slots generate most online casino revenue, and free spins are a simple, fixed-cost way to introduce players to them.
What are 100 free spins at 10p worth?
£10 of play, with an expected return of about £9.60 on a 96% RTP slot.
Related pages
Sources
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