The Bonus Max-Bet Rule: Why One Oversized Spin Can Cost You Your Winnings

Bonus terms tend to bury the clause that decides whether you keep your winnings. Wagering requirements get most of the attention, but a separate rule often matters as much: the maximum bet allowed while bonus money is in play. This guide explains what that rule is, why operators use it, how it interacts with wagering and game contribution, and what regulators require operators to tell you. Players must be 19+ in most provinces, and 18+ in Alberta, Manitoba and Quebec.

What a max-bet clause says

A max-bet clause sets a ceiling on the stake per spin, hand or game round while you are playing with a bonus or have unmet wagering. It usually takes one of two forms:

• A fixed amount, such as a set number of dollars or pounds per spin.
• A percentage of the bonus, which scales with the size of the offer.

Unibet's UK welcome terms show both at once. Its promotion terms list as prohibited "betting more than 30% of the initial bonus amount in any one game round" and "betting more than £15 per spin on slots while using bonus funds". The same terms say that breaking the rules allows Unibet to reclaim bonus funds and winnings from bonus funds. That is the standard consequence: losing what you won is the penalty, not just the bonus.

Why casinos impose it

A bonus with a wagering requirement is a bet by the casino that the house edge will consume the bonus before you clear it. A small number of very large stakes changes that bet. With high stakes you can either bust quickly or hit a big win early and then finish the wagering on low stakes with a large cushion. Volatility works for the player in that scenario, and the max-bet rule is there to remove it.

The UK Gambling Commission groups these clauses under the broader heading of play restrictions. In a 22 November 2017 statement it named "promotion specific play restrictions (eg maximum bet sizes, weighted wagering game requirements)" as terms that could lead to the "confiscation of deposits and winnings". It told operators to review them.

How wagering and contribution interact with it

The max-bet rule does not stand alone. It sits beside two other mechanics: the wagering requirement and game contribution.

OLG's bonus help page gives a simple example. Under a 10x wagering requirement, a $10 slot wager reduces a $600 requirement to $590. OLG also explains that bonus funds are used once your cash balance reaches $0.00.

Contribution rates decide how much each game counts toward that total. OLG's General Promotion Terms (section 5.2) set these rates:

The third column is a worked example: stake × contribution rate. A low contribution rate tempts players to raise stakes on table games to clear wagering faster, which is exactly where a max-bet ceiling bites. Unibet's terms above set slots at 100% and table games at 10%, with a 10x wagering requirement on slots.

Game restrictions are a separate rule

Some terms ban certain games outright instead of capping the stake. OLG's terms, in section 4.1(5), say bonus funds cannot be used on Sic Bo or on multi-player roulette, craps or baccarat. BCLC's PlayNow terms for its "Bet on Sports Get a Casino Bonus" offer exclude live casino, baccarat and roulette from the eligible games. Neither of these provincial documents includes a per-spin stake cap. That is a reminder that max-bet clauses vary by operator: some Canadian terms have one and some don't.

A worked example of the risk

Here is an illustrative case, using the structure of PlayNow's conditions. A $60 bonus at 10x needs $600 of play. PlayNow counts that as the $60 bonus plus $540 of play-through on winnings, and it holds the winnings in "Held Funds" until the wagering is complete. The bonus must be used within two days.

Now apply a hypothetical max-bet clause of $5 per spin to the same offer:

1. At $5 per spin, the $600 requirement takes 600 ÷ 5 = 120 spins.
2. A player who bets $20 on one spin by mistake has broken the clause, regardless of the outcome.
3. If that spin wins, the win is exactly what a reclaim clause like Unibet's lets the operator take back.
4. Bets made after the breach still count toward wagering in the player's mind, but they may not save the bonus.

The cap here is a teaching figure, not a real Canadian operator limit. Always read the actual number in the offer you are accepting.

Common ways players break the rule without meaning to

• Leaving a high stake set from cash play. Many games remember your last bet size. If you were playing with cash at a higher stake and then opt in to a bonus, the first spin may already be over the cap.
• Bonus-buy and feature-buy options. Buying a bonus round costs a multiple of the base stake, so a feature buy can exceed a per-round limit even when the base bet looks small.
• Doubling on table games. On blackjack, a double down or split adds to the stake for that round. A percentage-of-bonus cap counts the whole round.
• Forgetting that cash and bonus mix. Under OLG's model, your cash is used first and bonus funds start once cash reaches $0.00. The point at which the bonus rules start to apply can arrive mid-session without any warning on the screen.

None of these are edge cases. They are the routine ways a single line in the terms becomes a forfeited balance.

What regulators require

Ontario

In Ontario's regulated market, the AGCO's Registrar's Standards for Internet Gaming govern how bonuses are offered. Standard 2.05 bans advertising inducements except on the operator's own site and in direct marketing to players who have actively consented. Standard 2.06 requires operators to disclose all material conditions when an offer is first presented, with any others no more than one click away. It also says an offer can't be called "free" if the player's own money is at risk, or "risk-free" if a loss is possible. A max-bet limit that can cost you your winnings is a material condition. The AGCO has enforced 2.05: it issued $110,000 in penalties against BetMGM Canada.

The UK as a reference point

The UK has gone further in spelling out how stake caps must work. In 2018 the Competition and Markets Authority secured commitments from Ladbrokes, William Hill and PT Entertainment and said firms "cannot rely on vague terms to confiscate players' money". William Hill's undertakings list "any maximum stake size" and "any cap on winnings" among the significant conditions that must be shown prominently. They also require deposit and bonus balances to be shown separately.

The Gambling Commission's guidance on deposit withdrawals says that where a maximum stake applies, the player must not be able to exceed it. The software has to block the breach rather than penalise it afterwards. Players must also be able to withdraw their deposit balance even if it has been allocated to a bonus. In March 2025 the Commission announced a 10x cap on wagering requirements from 19 January 2026, along with a ban on mixed-product promotions. None of this binds Canadian operators, but it shows what a player-friendly version of the rule looks like.

Checklist before you opt in

1. Find the stake limit. Look for "maximum bet", "max stake" or a percentage of the bonus. If there is none, check for game exclusions instead.
2. Check whether the software enforces it. If the game lets you place a bet above the limit, the burden falls on you.
3. Check what a cash withdrawal does. Under OLG's section 5.1, any cash withdrawal removes casino bonuses with unmet wagering, including bonus winnings.
4. Match the game to the contribution table. A 0% game burns time and money without clearing anything.
5. Note the time limit. Short windows, such as PlayNow's two days, push players toward bigger stakes.
6. Decline if unclear. You can always play with cash only.

For how we score bonus terms, see how we rate casinos. Our bonuses page compares current offers, and safe online casino covers how to tell a regulated site from one that isn't.