Casino Bonus Terms Explained: How to Read an Offer Before You Accept It
The headline figure on a welcome bonus — “200% up to £500” or “100 free spins” — tells you almost nothing useful about whether the offer has any real value. The terms and conditions surrounding it determine whether the bonus is worth taking at all. Some offers that look generous are designed so that the average player will never successfully withdraw a penny from them.
This guide covers every clause that materially affects the value of a casino bonus, with real calculations so you can assess any offer before you deposit.
How Wagering Requirements Work
A wagering requirement (also called a playthrough requirement) is the total amount you must bet before bonus funds can be converted to withdrawable cash. It is expressed as a multiplier: 30×, 40×, 50×.
The calculation sounds simple but the basis — what the multiplier is applied to — changes the numbers dramatically.
Example: £100 deposit, £100 bonus, 35× wagering
Same multiplier. Double the work. Always check the basis.
Industry standard is 35× on the bonus amount only, but many operators — particularly those with lower-tier licences — apply the multiplier to deposit plus bonus. When a casino does not specify the basis clearly, assume deposit plus bonus until you can confirm otherwise.
BetterBonus flags anything above 40× as high-wagering and considers offers above 60× poor value in most circumstances.
Game Contribution Rates
Not all games count equally toward completing wagering. A £10 bet on a slot might contribute £10 toward your requirement. The same £10 stake on roulette might contribute £1 — or nothing at all.
Typical contribution rates (these vary by casino — always check the specific terms):
- Slots: 100% — standard for most casinos, though some exclude specific high-RTP titles
- Table games (blackjack, roulette, baccarat): 10%–20% — sometimes 0% on bonus funds
- Live casino: 0%–10% — frequently excluded entirely from bonus wagering
- Video poker: 0%–20% — often explicitly excluded
- Jackpot slots: 0%–50% — some operators exclude these to prevent large wins on bonus funds
If table games or live casino are your preference, bonuses at most casinos offer you almost no value. The only exception is a casino with a confirmed 100% contribution across all categories — rare, and worth checking carefully when claimed.
The Maximum Bet Rule
Most casinos impose a maximum bet per spin or hand while you have an active bonus. The typical limit is £5 per spin. Breaching this limit — even once — can void the entire bonus and any winnings accumulated from it, regardless of whether you have met the wagering requirement.
This clause catches players who adjust their stake upward as they wager. The enforcement is often automated, not manually reviewed, so there is rarely discretion involved. If the terms state a maximum bet of £5 during wagering, treat it as an absolute rule, not a guideline.
Some casinos set the limit lower — £2 or £3 — which significantly restricts which games you can play effectively. Check this figure before accepting any bonus.
Time Limits
Bonuses expire. The typical window to complete wagering is 7–30 days from the date of activation. Some casinos set limits as short as 3 days, which makes completing substantial wagering requirements virtually impossible without high-volume play.
Free spin winnings often have a separate, shorter expiry window — sometimes 24–72 hours — that applies to the winnings generated by the spins, not to the spins themselves. Failing to wager the winnings in time forfeits them.
Check both: the time limit to use the spins, and the time limit to complete wagering on any winnings from those spins. They are often different.
Sticky vs Cashable Bonus
This distinction determines whether you can withdraw the bonus amount itself once wagering is complete, or only the winnings generated by wagering with it.
Cashable bonus (non-sticky): Once wagering is complete, you withdraw your deposit, your winnings, and the bonus amount. Total withdrawable = deposit + bonus + net winnings.
Sticky bonus (non-cashable / phantom bonus): Once wagering is complete, the bonus amount is deducted before withdrawal. Only the deposit and winnings are withdrawable. The bonus was a wagering vehicle, not a fund you keep.
Example: £100 deposit, £100 sticky bonus, wagering complete, £250 in account
Neither format is inherently better — sticky bonuses are often larger because the casino retains the principal, which improves their expected value for the operator. A large sticky bonus can still be worth taking if the wagering requirement is low enough. Calculate accordingly.
Maximum Cashout
Some bonuses cap how much you can withdraw from winnings generated with bonus funds, regardless of your actual balance. A maximum cashout of 5× the bonus means that if you received a £50 bonus, you can withdraw no more than £250 from bonus play — even if you are holding £2,000 after a big win.
Free spin bonuses commonly include this restriction. A “100 free spins, max cashout £100” offer means the spins have a fixed ceiling on what they can generate for you, regardless of outcome.
When a bonus does not list a maximum cashout, read carefully — some operators use the phrase “no maximum cashout” as a headline while burying a restriction under a different clause name, such as “maximum conversion” or “maximum withdrawal from bonus funds.”
T&C Red Flags
These clauses appear in some operators' terms and are worth stopping for. Each one creates a condition under which the operator can void your winnings or bonus without recourse.
- “Casino reserves the right to void bonus or winnings at its sole discretion” — no qualifying criteria means this clause can be invoked for any reason.
- “Irregular play patterns” without defining what constitutes irregular play — can be used to void winnings from legitimate strategy.
- No listed contribution rates — if not published, assume the worst: table games and live casino may contribute 0%.
- Wagering requirement stated as “deposit + bonus” buried in a footnote — when the headline states only the multiplier, check every footnote and linked terms document for the basis.
- Very short expiry (3 days or fewer) — on high-wagering requirements, this is functionally impossible to complete without unsustainable session lengths.
- Free spins restricted to a single game — if that game is a low-RTP title or is excluded from bonus wagering, the spins may generate winnings you cannot retain.
Calculating the Real Value of a Bonus
A rough formula for estimating whether a bonus is worth taking:
Take the wagering requirement (in total pounds, not as a multiplier) and multiply it by the house edge of the game you plan to play. The result is your expected statistical cost to complete wagering.
Example: £100 bonus, 30× wagering on bonus only, playing slots with 4% house edge
The bonus costs more to complete than it is worth. This is before variance — you may profit, but the expected value is negative.
Lower wagering requirements (under 25×) combined with high-RTP games can shift this to a positive expected value. This is why experienced players look for low-wagering bonuses with slots that have a published RTP above 97%, not the highest headline bonus figure.
For a breakdown of how RTP and house edge work, see our Casino Games Guide.