What 40x Wagering Actually Costs on a €100 Bonus

Forty is a harmless-looking number. Put an “x” beside it, attach it to a casino bonus and it can quietly turn €100 into several thousand euros of required betting.

A wagering requirement is the amount of qualifying bets you must place before restricted bonus funds and their related winnings become withdrawable. The requirement can be based on the bonus alone, the deposit plus bonus, or another amount named in the promotion. [1]

That definition sounds tidy. The practical version is messier, because “40x” does not tell you what is being multiplied.

Forty times what?

Suppose you deposit €100 and receive a €100 bonus.

If the requirement is 40x the bonus, the calculation is:

€100 × 40 = €4,000

If the requirement is 40x the deposit and bonus, the starting base is €200:

€200 × 40 = €8,000

The banner can say “40x” in both cases. One offer asks for twice as much turnover.

This is why I translate every multiplier into euros before judging the promotion. “40x” is advertising shorthand. “You must place €8,000 of qualifying bets” is a sentence your wallet can understand.

Wagering counts bets, not losses

The €4,000 target does not mean you hand the casino €4,000. Winnings return to your balance and may be staked again. A €1 spin normally adds €1 to the wagering total when the game contributes at 100%.

You might cycle the same €150 through hundreds of rounds and produce thousands of euros in turnover. The catch is that every round exposes the balance to the game’s mathematical edge. The longer the conveyor belt runs, the more chances the casino has to collect its small toll.

Imagine playing a slot with a theoretical 96% return to player. Over very large volumes, the mathematical house edge is about 4%. Across €4,000 of turnover, the rough expected loss is €160.

€4,000 × 4% = €160

That is not a forecast of your session. You might lose the balance early, finish ahead or land anywhere between. RTP is a long-run average, not a promise that every €100 returns €96. [2]

Still, the calculation explains why a “free” bonus can be expensive to complete. The casino gives you extra balance, then asks you to keep feeding that balance through a game with a built-in edge.

Game contribution can make 40x much larger

Slots often contribute 100% toward wagering. Table games may count at 50%, 20%, 10% or not at all.

If your target is €4,000 and blackjack contributes 10%, every €10 bet removes only €1 from the requirement. Clearing the full target through that game would need €40,000 in actual betting.

€4,000 ÷ 10% = €40,000

This weighting is called game contribution. Regulators use the same example when explaining why a nominal wagering cap can still feel much larger on games with reduced contribution. [3]

My view is simple: judge the bonus using the contribution rate of the game you actually want to play. A good rate on slots is irrelevant if you came for blackjack.

The maximum bet rule is the trapdoor

Many bonuses limit the maximum stake while wagering is active. A common limit is €5 per spin, although the exact amount varies.

If you place a €10 spin, even by mistake, the operator may argue that you breached the promotion and remove the bonus winnings. Licensed operators in Great Britain are expected to state prohibited play clearly and explain the exact breach when winnings are withheld. [4]

I dislike rules that the interface could prevent but chooses not to. A forbidden bet should be blocked at the button. Until that becomes normal, check the maximum stake before the first spin, not after the withdrawal fails.

Is 40x good or bad?

On bonus-only wagering, 40x has been common in many international markets. That does not make it fair by default.

It is easier to accept when:

• The requirement applies only to the bonus
• Your preferred games contribute at 100%
• The maximum stake is obvious
• The time limit is reasonable
• There is no severe maximum cashout
• Cash and bonus balances are clearly separated

The same 40x becomes poor when it applies to deposit plus bonus, uses low game contribution, expires quickly or caps your eventual withdrawal.

Jurisdiction matters too. Great Britain-licensed operators have been limited to a maximum 10x wagering requirement on bonus funds since 19 January 2026. [5] A 40x offer may still appear under other licences, but it should not be treated as a universal norm.

The five-line check

Before accepting a bonus, find these five answers:

1. What amount is multiplied?
2. Which games count, and by how much?
3. What is the maximum bet?
4. When does the bonus expire?
5. Is there a maximum cashout?

If one of those answers is buried, vague or missing, the headline amount is not enough information to make a sensible choice.

A 40x bonus is not automatically a scam, and it is certainly not free money. It is a contract measured in turnover. Convert the multiplier into euros first. The promotion usually becomes much easier to judge once the neon is switched off.