Every casino shouts about the size of its welcome bonus, because the headline number is what grabs attention. But the number tells you almost nothing about whether the offer is any good — the terms attached to it decide that.
This guide gives you a simple checklist to judge any bonus in a minute, explains why a smaller offer often beats a bigger one, and flags the red flags worth walking away from.
Why bigger isn't better
A £500 bonus at 45x wagering requires £22,500 of turnover to clear; a £100 bonus at 25x needs £2,500. The smaller offer is far easier to convert into withdrawable cash, and on typical slots it can be the difference between positive and negative value.
This is the core lesson: the headline figure is marketing, the terms are the reality. Our wagering guide shows the maths, and the bonus calculator prices any offer instantly.
The five things to check
Before claiming any bonus, run it through these five checks. Any one of them can turn a generous-looking offer into a trap, so it is worth the two minutes.
| Check | What's good | Watch for |
|---|---|---|
| Wagering | 25x or lower | 40x+ is hard to clear |
| Applies to | Bonus only | Deposit + bonus (doubles it) |
| Max cashout | None, or high | Low caps (e.g. £50) limit winnings |
| Game contribution | 100% on games you play | Slots-only when you play tables |
| Time limit | 14–30 days | 3–7 days is a rush |
Bonus types, compared
Different bonus types suit different players. A deposit match rewards a larger deposit; a no-deposit bonus lets you try a casino risk-free; free spins target specific slots; cashback softens losses. Each has its own catch to watch.
For the detail on two of the most common types, see our guides on no-deposit bonuses and whether free spins are worth it.
Red flags to walk away from
Some terms should end your interest immediately: wagering above roughly 50x, a maximum cashout so low the bonus can never pay meaningfully, a maximum bet rule buried in the fine print that voids the bonus if breached, or an operator that is not clearly licensed.
A fair casino states every term plainly and up front. If the terms are hidden, contradictory, or the operator's licence cannot be verified on a regulator's register, that is your answer.
Match the bonus to how you play
The best bonus for you depends on your habits. A slots player wants high game contribution and reasonable wagering; a table-games player needs an offer that actually counts table play. A casual player benefits from a long time limit; someone clearing a bonus should favour lower-volatility slots to survive the turnover.
On SlotVault every listing decodes the wagering, time limit and key terms so you can apply this checklist at a glance — and our trust scores weigh exactly this kind of term fairness.
Frequently asked questions
What makes a good casino bonus?
Low wagering (25x or lower), terms that apply to the bonus rather than deposit plus bonus, no punishing maximum cashout, full game contribution on the games you play, and a reasonable time limit. These matter far more than the headline size.
Is a bigger casino bonus always better?
No. A large bonus with high wagering can be worth less than a small one with fair terms. A £100 bonus at 25x is usually easier to convert to cash than a £500 bonus at 45x, which needs £22,500 of turnover to clear.
What is a good wagering requirement?
For most bonuses, 25x or lower is good value, around 35x is average, and above roughly 50x is hard to clear profitably. Always check whether the multiplier applies to the bonus alone or to deposit plus bonus.