Can a registered Ontario online casino change a game's payout percentage after it has been approved?

Your underlying worry here is a fair one: could a casino quietly dial down a slot's RTP after you've already started playing it, pocketing a bigger cut without you ever knowing? In Ontario's regulated market, the answer is no — and there's a concrete regulatory structure that makes it essentially impossible to do so without the AGCO's knowledge.

How games get approved in the first place

Only games and remote gaming servers approved by the Registrar or certified by an independent testing laboratory registered by the Registrar may be used on a gaming site. That approval is tied to the game's specific configuration — including its theoretical payout percentage (RTP). The rules of play that accompany that approval are not a one-time formality. Rules of play, including any subsequent modifications, must be submitted to the Registrar for approval, and those rules must contain, at a minimum, odds of winning, payout odds, or returns to players. In plain terms: if an operator or game supplier wants to change the RTP of an approved title, that change is itself a modification to the rules of play — and it requires fresh regulatory sign-off, not a quiet server-side tweak.

No self-adjusting payouts allowed

The AGCO's technical standards close another potential loophole explicitly. Features that automatically adapt the payout of a game are not permitted. So even a system designed to gradually shift payback without human intervention — sometimes called "adaptive RTP" — is flatly prohibited. The RTP a game is approved with is the RTP it must deliver.

Ongoing monitoring keeps operators accountable

Approval isn't a one-and-done event. Monitoring and testing must be performed throughout the life of the gaming system and gaming supplies to ensure they are operating as approved. On top of that, operators must monitor the payback of their live games to detect any behaviour that may indicate faulty performance. And players aren't left in the dark about what the disclosed RTP actually is: the player must be provided with accurate information to make informed choices, including — where games have different theoretical payout percentages for different betting options — at minimum the lowest theoretical payout percentage across all betting options.

There's also an independent audit layer. All registered internet gaming operators must submit an independently audited assessment of the processes and controls they have in place to meet the Registrar's Standards, covering all controls related to the gaming site, including where the operator works with third-party suppliers and platform providers. The AGCO can also direct third-party audits at any time, with the auditor reporting directly to the Registrar rather than the operator.

What this means practically for Ottawa players

If you're playing on a site that carries both the iGaming Ontario logo and the BetGuard logo — which all fully registered Ontario operators are required to display — you're playing on a platform subject to all of these controls. An operator cannot simply push a new game configuration live; the modification pathway runs through the AGCO. The full list of registered operators is maintained at the iGaming Ontario website, which is always the authoritative source for confirming a site's status.

One thing worth distinguishing: RTP is a long-run statistical average, not a session-by-session guarantee. A game with a 96% theoretical payout can produce very different results over any given hour of play — that's variance, not manipulation, and it's normal. If you ever want to take a step back from online gambling, ConnexOntario (1-866-531-2600) offers free support, and BetGuard (betguard.ca) lets anyone 19+ self-exclude from all Ontario-regulated sites in a single request. But the short answer to your question is that the regulatory framework is specifically designed to prevent the scenario you're worried about.