Wagering requirements are how a “£50 free” bonus can end up worth nothing — and occasionally how it can be genuinely valuable. The difference is arithmetic that operators hope you won’t do. Let’s do it.
The definition, precisely
A wagering (or playthrough) requirement is the total amount you must stake before bonus winnings convert to withdrawable cash.
£20 bonus, 10x wagering = £200 in bets before you can cash out bonus winnings.
Watch the multiplier base: “10x bonus” on a £20 bonus is £200, but “10x deposit + bonus” on a £20 deposit + £20 bonus is £400 — twice the hurdle from the same headline number. Since the UKGC’s January 2026 rules, 10x is the legal maximum and deposit-plus-bonus structures have been largely squeezed out — any site offering 35x+ to UK players today is worth a licence check.
What wagering actually costs: the expected-value formula
Every bet you place while clearing wagering pays the house edge. So:
Expected cost of wagering ≈ wagering amount × house edge
Worked examples for a £50 bonus at 10x (£500 wagering):
| Game used | RTP | Expected cost of £500 wagering | Bonus worth (expected) |
|---|---|---|---|
| High RTP slot | 97% | £15 | +£35 |
| Average slot | 96% | £20 | +£30 |
| Low-variant slot | 92% | £40 | +£10 |
The same bonus is worth three times more cleared on a 97% game than a 92% one — which is why our high RTP slots list matters most to bonus players, and why you should always check the RTP variant at your specific casino.
The honest caveat: these are averages. Clearing £500 of wagering on a volatile slot with a £50 starting balance busts more often than the expected value suggests. Positive EV is not a guarantee — treat bonuses as discounted entertainment, not income.
The four traps in the fine print
- Game contribution rates. Slots count 100%; roulette, blackjack and live games often count 10–20% or nothing. £100 on blackjack may clear £10 of wagering.
- Maximum bet while wagering. Usually £2–£5 per spin. Exceed it — even accidentally — and the casino may void the bonus and winnings. This is the most enforced term in the book.
- Expiry windows. Commonly 7–30 days. Unfinished wagering at expiry forfeits the bonus and its winnings.
- Excluded games and max win caps. Jackpot slots are usually excluded; some offers cap convertible winnings (e.g. £100 max), which slashes the real value.
The alternative: skip wagering entirely
The cleanest solution to wagering maths is a bonus with none. No-wagering offers pay winnings as immediately withdrawable cash — smaller headline numbers, dramatically higher real value for most players. We compare the genuine ones in our no wagering bonuses page.
If you do take a wagering bonus:
- Read the contribution table before your first spin
- Note the max bet and set your stake below it
- Play a high-RTP, low-volatility eligible slot
- Decide in advance to stop if the balance busts — never deposit to “rescue” a bonus
And remember the withdrawal test: a bonus cleared at a slow-paying casino is still slow money. Cross-check any bonus site against our fastest withdrawal rankings.