The number that matters is not the bonus. It is the total you must bet before the bonus becomes withdrawable, and the expected cost of placing those bets. A £100 bonus at 35× requires £3,500 of wagering. On slots at a typical house edge, placing £3,500 of bets costs somewhere around £140 in expectation — more than the bonus is worth.
How are casino bonus wagering requirements calculated?
Two operators can advertise “35×” and mean materially different things, because the multiplier is applied to different bases.
| Basis | On a £100 deposit + £100 bonus | Wagering required |
|---|---|---|
| Bonus only | 35 × £100 | £3,500 |
| Deposit + bonus | 35 × £200 | £7,000 |
The same advertised multiple produces double the obligation. “Deposit + bonus” is common and rarely highlighted. It is the first thing to check in the terms, and it is usually one line.
How much do different games count towards wagering?
Not every bet counts fully. A typical contribution table looks something like this:
| Game | Contribution | £10 bet counts as |
|---|---|---|
| Slots | 100% | £10 |
| Roulette | 10–20% | £1–2 |
| Blackjack | 0–10% | £0–1 |
| Live dealer | Often 0% | £0 |
The logic is straightforward from the operator's side: games with a lower house edge are worth less to them, so they count for less. The consequence is that clearing a bonus on blackjack at 10% contribution requires ten times the turnover — £35,000 rather than £3,500 — which is not a realistic path.
In practice, bonuses are cleared on slots or not at all.
What can clearing a wagering requirement cost?
Wagering is not a fee you pay once. It is turnover you must generate, and generating turnover costs money because the house has an edge on every bet.
Online slots typically return somewhere around 95–96% of stakes over the long run, so roughly 4–5% of everything you bet is lost in expectation. Applying that:
| Offer | Turnover needed | Expected cost | Net |
|---|---|---|---|
| £100 bonus, 20× bonus only | £2,000 | £80–100 | roughly break-even |
| £100 bonus, 35× bonus only | £3,500 | £140–175 | negative |
| £100 bonus, 35× deposit + bonus | £7,000 | £280–350 | heavily negative |
| £50 bonus, 40× deposit + bonus | £4,000 | £160–200 | heavily negative |
This is the genuinely counter-intuitive part: a headline offer can carry a negative expected value once the wagering attached to it is priced in. The bonus is not free money with conditions. It is a discount on a cost you are being asked to incur.
Two caveats, in fairness. This is expectation, not outcome — variance is large, and individual players do clear bonuses and withdraw. And the multiple matters enormously: at 20× on bonus only, the arithmetic is close to neutral.
What limits do UK rules place on bonus wagering?
Since 19 January 2026, operators licensed in Great Britain may not set a wagering requirement above ten times the bonus funds, and a single offer may not require play across more than one kind of gambling — betting and casino, for instance. The cap is on the bonus, not on deposit plus bonus.
Worked through on the same £100 bonus, that sets the ceiling at £1,000 of turnover and, at an assumed 4–5% house edge, an expected cost of £40–50 — at most half the bonus. Every offer in the cost table above would breach that condition for a British licensee.
Offshore operators are not bound by it. Of the operators we list whose own terms we could read, two state a multiple: 35× and 45×, both applied to deposit plus bonus. The arithmetic on this page is how to tell which side of that line an offer sits.
How do sticky and non-sticky bonuses affect withdrawals?
A distinction worth knowing, because it changes what you can do mid-session.
With a non-sticky bonus, your deposit and the bonus are kept separate. You play the deposit first, and if you win enough you can withdraw before touching the bonus at all — forfeiting it, but keeping your winnings without any wagering. This is the player-friendly structure, and it is uncommon.
With a sticky bonus the funds are pooled. Every pound in the balance carries the wagering requirement, and withdrawing before it is cleared forfeits the bonus and usually everything won with it. Most welcome offers are sticky.
The terms rarely use these words. Look instead for whether withdrawal before completion forfeits only the bonus, or the bonus and its winnings.
Which bonus terms can reduce or void my winnings?
- Maximum stake while a bonus is active. Usually £5 per spin. Exceed it once and everything can be voided — the most common cause of confiscated balances, and it is enforced. See confiscated balances.
- Maximum winnings from a bonus. Often 5× the bonus. Clear the wagering, win £3,000 from a £50 bonus, and you are paid £250. Covered in withdrawal limits.
- Expiry. Commonly 7–30 days. Unfinished wagering when the clock runs out usually voids the bonus and anything won from it.
- Excluded games and features. Some slots do not count at all. Bonus-buy features are increasingly prohibited outright while a bonus is live, and using one can void the balance rather than simply not counting.
- Withdrawal cancels the bonus. On a sticky bonus, withdrawing before wagering is complete typically forfeits the bonus and its winnings.
How a maximum stake affects bonus wagering: an example
The maximum-stake rule and the wagering requirement pull in opposite directions, and seeing both in one calculation shows why so many bonuses end in a voided balance.
Take a £100 deposit with a £100 bonus, 35× on deposit plus bonus, a £5 maximum stake and 30 days to finish:
- Turnover required: 35 × £200 = £7,000.
- At the £5 maximum, that is at least 1,400 spins. At £1 a spin it is 7,000.
- Over 30 days, 7,000 spins is about 233 a day, every day. At around six seconds a spin, that is roughly 23 minutes of continuous play daily — before any losing streak that empties the balance first.
- Expected cost at a 4–5% house edge: £280–350, against a £100 bonus.
Raising the stake from £1 towards £5 cuts the number of spins without breaking the rule. Going one step further — a single £6 spin — would exceed the stated maximum, and under typical bonus terms that can void the bonus balance.
How much would I need to wager each day before expiry?
Expiry is the term people underestimate, because it converts a large number into a daily rate.
A £3,500 requirement over 14 days is £250 of turnover every single day. At £1 a spin that is 250 spins daily for a fortnight, with no days off. At £2 a spin it is 125 — but you are now closer to any maximum-stake rule and burning through the balance faster.
Before accepting a bonus, divide the requirement by the days available and ask whether that is a session you actually want. If the honest answer is no, the bonus is not worth claiming, because an unfinished requirement forfeits everything anyway.
How to assess a casino bonus before accepting it
- Find the multiplier, and whether it applies to bonus only or deposit + bonus.
- Multiply out the total turnover required.
- Take 4–5% of that. This is the approximate expected cost of clearing it.
- Compare against the bonus. If the cost is higher, the offer is negative value.
- Divide the turnover by the days to expiry. Is that a session you want?
- Check maximum stake, maximum win, and excluded features. Any one can void the lot.
Most welcome offers fail at step four. That is not an argument that nobody should ever take one — it is an argument for knowing which side of the calculation you are on before you click accept.
The structural problem with wagering. A requirement creates an obligation to keep betting in order to access money that already shows in your balance. That is precisely the mechanism that turns a planned session into a long one, and it is part of why Great Britain capped wagering at ten times the bonus from January 2026. If you find yourself playing to clear a requirement rather than because you want to be playing, the bonus is costing you more than it can pay. Support and blocking tools are here.
Which bonus terms do we record for listed casinos?
For each operator we list, we record whether its bonus terms state the multiplier and its basis, the maximum win, the maximum stake and any monthly withdrawal cap where a visitor can read them before depositing — because the headline figure on its own is close to meaningless. How the check works.
Sources
- Gambling Commission licence condition on incentives (SR code 5.1.1) and its commencement record
- Operator figures: our own reading of operators’ bonus pages on 23 and 24 September 2026 — the results
Common questions
What does 35x wagering actually cost me?
On a £100 bonus applied to the bonus only, it means £3,500 of turnover. At a typical slots house edge of 4–5%, placing those bets costs roughly £140–175 in expectation — more than the bonus is worth. If the multiplier applies to deposit + bonus, double it.
Why does blackjack barely count toward wagering?
Because it has a much lower house edge than slots, so the operator earns less from your turnover there. Contribution rates are set to reflect what each game is worth to them, which is why bonuses are cleared on slots or not at all.
Is any bonus ever worth taking?
At around 20x on bonus only, the arithmetic is close to break-even, and a low or absent cap on bonus winnings improves it further. Most welcome offers sit well past that point. Run the five-step check rather than judging by the headline figure.
