GGR-based tax structures
Most regulated European markets levy a percentage of gross gaming revenue (GGR) - the operator's revenue after winnings paid out, before opex. The UK's Remote Gaming Duty is 21% on online casino and 15% on remote betting; the General Betting Duty applies separately to bookmakers. Sweden's Spelinspektionen runs an 18% point-of-consumption GGR tax. Spain runs a 20% GGR tax on online operators. Denmark runs 28% GGR. The Netherlands tax on iGaming GGR is currently 30.5%. Germany's GluNeuRStV applies a 5.3% turnover tax on virtual slots and online poker - structurally a turnover tax, not GGR. These rates set the operator's gross margin ceiling before player-acquisition cost, payment processing fees, and platform-supplier revenue-share are subtracted.
Turnover-based tax structures
Turnover tax is levied on stakes wagered before winnings are paid out. Operators dislike turnover tax because the cost-per-bet scales with churn, not with retained revenue - a high-frequency low-margin product (sports betting, slots) carries proportionally more turnover than a low-frequency high-margin product (poker tournaments). France runs turnover-based taxation across most of its remote-gambling framework. Germany's 5.3% online-slots tax is turnover-based. Where regulators move from turnover to GGR (Sweden in 2019, Germany pre-GluNeuRStV) the operator margin improves materially; where regulators move from GGR to turnover (some emerging-market proposals) operators typically push back hard.
Licence fee plus revenue share
Smaller jurisdictions and tribal-compact-style frameworks often use a fixed annual licence fee plus a percentage of GGR or net win. Curacao's historic master-licence model was nominally fee-based with low headline revenue share; the new CGCB framework under NOOGH moves closer to the European GGR norm. State-tribal compacts in the United States typically use a hybrid model with state revenue-share rates ranging from single digits (some states) to over 50% (New York for sports betting). The structure matters because fee-based licences advantage high-volume operators (the fee amortises across more bets); GGR-based taxes are revenue-neutral across operator size.
Operator-cost implications
A 21% UK GGR rate looks expensive relative to a 10% Maltese rate - but the comparison is incomplete without licence cost, compliance overhead, advertising rules, and the cost of payment processing in each market. UK-licensed operators access UK payment rails, UK media inventory, and UK sports-rights partnerships at a different cost structure than Maltese-licensed offshore traffic. A B2B operator-cost model should evaluate total cost of operating per jurisdiction, not just headline tax rate. The iGaming Times Regulatory Map per-country pages document the licence cost, the renewal cycle, the AML / KYC obligations, and the advertising rules alongside the tax rate for an apples-to-apples comparison.