A review of welcome bonuses at 50 online casinos has found that advertised wagering requirements frequently understate how much a player actually needs to stake before withdrawing winnings. Comparison platforms such as Casino&Bonuses Finder have been following the findings closely, since the calculation issue identified can affect how bonus listings are compared across operators generally.
What the Study Found
The research, carried out by a comparison site over a two-week period in June 2026, involved researchers registering real accounts, depositing funds, and claiming welcome bonuses at each of the 50 casinos to record the terms as presented at the point of claiming. Among the results:
- 22 of the 50 casinos, or 44%, calculated the wagering requirement against the combined value of the deposit and the bonus, rather than the bonus alone
- A further 15 casinos did not specify in their terms which basis applied at the point of claiming
- Nearly three-quarters of the casinos restricted which games counted toward the wagering requirement
- Multi-stage welcome packages advertised at 20x to 30x reached an effective 40x once every stage was completed
Why the Calculation Method Matters
The difference in method has a direct effect on the total amount a player must wager. The study cited an example in which a deposit of 100 units matched by a 100-unit bonus at a nominal 30x requirement would need 3,000 units in total bets if the requirement applied to the bonus alone, but 6,000 units if it applied to the combined deposit and bonus amount, effectively doubling the stakes required to clear the offer.
A Recurring Pattern in Bonus Terms
Casinobonusesfinder.com has noted that this kind of calculation gap is not isolated to one study or one set of operators; it reflects a broader pattern in how bonus terms are written across the industry, where two offers advertising the same headline multiplier can carry very different real costs depending on how the requirement is calculated.
An analyst who has reviewed similar bonus structures commented on the practical effect for players trying to compare offers:
“The advertised multiplier tells you almost nothing on its own without knowing what it’s applied to.”
Limitations of the Sample
The researchers noted that the 50 casinos included in the study were drawn from operators already featured on the comparison site rather than sampled at random across the wider market. The findings cover welcome bonuses only and represent a snapshot taken during a two-week window in June, so results may vary across other operators not included in the sample.
CasinoBonusesFinder said the calculation issue identified in the study, where wagering requirements are applied to the deposit and bonus combined rather than the bonus alone, is one that listings services have had to account for more broadly when comparing offers across operators, since the practice shows up in bonus terms well beyond the casinos covered in this particular sample.
With welcome bonus structures continuing to vary widely between operators, comparison resources are expected to keep tracking which casinos apply the more favorable, bonus-only calculation method identified in the research, rather than the combined deposit-and-bonus approach that can quietly double the stakes required to clear an offer.