Knowledge Base
Articles to understand the mathematics behind bonuses, plus our methodology and transparency.
Typical wagering
35ร
โฌ100 bonus = โฌ3,500 rollover
Bonus age floor
24+
gambling itself is 18+
Typical NL matchbonus
โฌ100 tot โฌ500
capped by compliance
start here
Start with three articles that make the rest of the knowledge base easier to use.
This is the fastest route through BonusWijs: understand EV first, then wagering, then how to choose between bonus structures.
What is EV (Expected Value) for a casino bonus?
EV is the expected profit or loss from a bonus if you play through all the wagering. In plain language, with the math.
Read more โWagering explained: the honest math
Wagering requirements determine whether a bonus is profitable. Here is how they work and why they are usually the real trap.
Read more โWhich casino bonus to pick: a five-step decision framework
Five questions that decide which bonus fits. Bankroll, variance, wagering, session length, end goal. With calculator links.
Read more โHow bonuses work
Wagering explained: the honest math
Wagering requirements determine whether a bonus is profitable. Here is how they work and why they are usually the real trap.
Read more โRTP at online casinos: what does it actually mean?
Return To Player is the average percentage that slots return. Here is why 96% does not mean you get 96% back.
Read more โGame weighting: why slots-only rules decide bonus EV
Game weighting decides which share of your wager counts toward clearing. 100% on slots, 10% on table games, 0% on live. Here is what that means for your bonus.
Read more โKSA bonus rules: what Dutch casinos can and cannot offer
The Dutch gambling authority (KSA) imposes hard limits on bonuses. Age 24+, no unsolicited offers, mandatory cooling-off periods. Full list here.
Read more โBonus types
Free spins bonus: is 'free' actually free?
Free spins look free, but wagering decides whether you can actually cash out. The math, laid bare.
Read more โNo wagering bonus: do they actually exist in the Netherlands?
No wagering bonuses barely exist in the Netherlands. What casinos call that is usually something else. Here is what you actually get.
Read more โNo deposit bonus: what is it worth without depositing?
No deposit bonuses look like free money, but wagering and cashout caps decide the real value. Here is the math.
Read more โCashback casino: the bonus that often wins on EV
Cashback returns part of your loss. Unlike match bonuses, there is no wagering on the refund. Here is why the math works in your favour.
Read more โMulti-deposit bonus: what a multi-stage welcome package actually yields
888, ComeOn and GetLucky split the welcome across three deposits. Here is what that does to your EV, time, and risk.
Read more โMaking the call
Max cashout on casino bonuses: the cap that cuts your EV
Max cashout limits how much you can withdraw from a bonus. Here is which casinos cap low and how much EV that costs.
Read more โWhich casino bonus to pick: a five-step decision framework
Five questions that decide which bonus fits. Bankroll, variance, wagering, session length, end goal. With calculator links.
Read more โWhy Dutch casino bonuses are smaller than their EU counterparts
Dutch bonuses usually sit at โฌ100-โฌ500. Elsewhere in the EU they reach โฌ1,000+. The reason is regulation, tax, and KSA limits.
Read more โ