A wagering requirement is the multiplier a casino applies to a bonus before any winnings from that bonus can be withdrawn. If a casino advertises a "100% match bonus up to €100 with 35× wagering on bonus only", that means you need to bet €3,500 (35 × €100) before the bonus becomes withdrawable cash. This page is the working explanation: what wagering does, how to compute the realistic value of a bonus before you take it, and the terms that turn an attractive headline into a poor deal.
Author: Marijan Karajanov. Last updated: 20 May 2026. Scoring detail: /methodology#bonus.
When you accept a bonus, the bonus amount is locked. You can keep playing with it, but every time you bet, a fraction of your stake counts toward "clearing" the bonus. Once cumulative qualifying stakes equal the bonus amount times the wagering multiplier, the bonus converts to withdrawable cash. Until then, requesting a withdrawal forfeits the bonus and (often) any winnings from playing with it.
Wagering requirements aren't arbitrary. They exist to ensure the casino keeps enough of the bonus value back, on average, to make the promotion economic. Every wager carries the house edge; cumulative wagers at the bonus level usually erode the bonus back to roughly the casino's expected hold.
Every wagering term has three numbers that determine its real cost. You can usually find all three on the bonus terms page.
This is the most prominent number on the marketing page. It's also the least informative on its own — a 35× multiplier with "bonus only" wagering is twice as easy to clear as 35× "deposit plus bonus" wagering.
Not every game contributes 100% to clearing wagering. Typical contributions:
If you prefer table games and the bonus excludes them, the bonus is not really for you.
The headline value of a bonus is what the marketing copy says. The realistic value is what you can expect to keep, on average, after meeting the wagering requirement.
Approximate formula (slots, 100% contribution, "bonus only" wagering):
Expected value retained ≈ Bonus × (1 − (Wagering multiplier × Average house edge))
With a 35× multiplier on a €100 bonus and average slot house edge of 4% (which is typical of audited Tier-1 RTP slots):
€100 × (1 − (35 × 0.04)) = €100 × (1 − 1.40) = −€40
The expected value is negative for the bonus alone. Where it lands net positive for the player is when you combine it with the deposit you would have made anyway. The bonus extends your expected playtime by about €70 worth of stake-volume; you keep on average about €60 of the original bonus if you play through it on the most player-friendly slots and stop at zero.
If wagering jumps to 50× and contribution drops to 50% on your preferred games, the same formula returns a deeply negative number. That bonus is not realistically clearable for the typical player.
A common term: maximum bet of €5 per spin during wagering. Combined with a high wagering multiplier, this turns the bonus into a long evening of low-stakes play. €5 × 700 spins = €3,500 in turnover. At an average of 30 seconds per spin, that's roughly 6 hours of focused play to clear €100 of bonus. Operators that don't impose such caps make the bonus much more flexible.
If wagering must be completed within 7 days for a 35× bonus, the time-pressure forces you into faster, riskier play. 30-day expiries give you headroom to play normally. Anything under 14 days for a 35×+ bonus is unlikely to be cleared by an average player without dedicated bonus-hunting effort.
"Maximum cash-out from bonus winnings: 5× the bonus amount." This caps your upside while leaving the downside open. If you turn €100 bonus into €1,000, the operator only pays €500. This term is common at offshore-licensed operators and rare at well-regulated EU operators.
"Irregular betting patterns are prohibited and will result in bonus forfeiture." This clause is vague by design. In practice it has been invoked to void winnings on patterns like: betting a small fraction of your balance, betting on multiple paylines but very low stakes, alternating between high-RTP and low-RTP games. Track what you do; if the operator invokes this, ask for the specific spin or sequence that triggered the rule.
Every operator review on BetVouch includes a bonus walkthrough where we accept the headline bonus on a test account and compute its realistic recoverable value before the review is published. The bonus fairness criterion (15% weight in our overall rating) reflects:
The full per-criterion scoring is on /methodology#bonus.
For Dutch players: KSA-licensed operators must publish bonus terms in Dutch and must align with KSA-mandated affordability and advertising rules. In practice this has constrained the most aggressive bonus structures — there is no €1,000 welcome bonus at a KSA-licensed operator, because the regulator's framework would not approve it. The typical KSA-market welcome bonus is in the €100–€250 range with 30–40× wagering on bonus only, 100% slot contribution, 30-day expiry, and no max-cashout cap.
Operators outside the KSA framework that solicit Dutch players (without an NL licence) frequently advertise larger headline bonuses with structurally worse terms. See our guide to KSA-licensed casinos for Dutch players and our licence comparison for context.
"Would I make this deposit and play these games for this length of time without the bonus?"
If yes, the bonus is a bonus — extra value layered onto play you were going to do anyway.
If no, the bonus is converting you into a player you didn't intend to be. That's where bonuses generate negative outcomes that aren't visible in the wagering math: the time you spent meeting wagering you wouldn't have otherwise spent gambling, plus the playtime extension that compounded with the house edge.