Slot Machine Bonus Buy Feature
What it is, why US casinos don't have it, and what AP players do instead
What Is a Bonus Buy Feature?
A bonus buy feature — sometimes called a feature buy, bonus purchase, or ante bet — is a slot machine option that lets a player pay a one-time premium to immediately trigger the game's bonus round. Instead of spinning and waiting for the bonus to land naturally, the player pays a fixed multiple of their current bet, typically between 50x and 100x, and the game skips straight to the free spins, pick bonus, or whatever the headline feature is.
From the player's perspective the appeal is obvious: bonus rounds are the exciting part of the game, and the bonus buy removes the grind of base-game spins that can feel like filler. From a software developer's perspective the feature is a monetization tool — players spend more per session, and the premium is priced to favor the house.
Where Bonus Buys Are Available
Bonus buy features are a standard offering in UK and European online casinos. Major slot studios including Pragmatic Play, Big Time Gaming, Relax Gaming, and many others ship games with bonus buys as a core mechanic. In the UK market the feature has faced scrutiny from the Gambling Commission — voluntary restrictions and outright bans were debated — but it remains legal and widely available.
In continental Europe, Malta-licensed operators, and most international online casino markets the feature is similarly standard. Players who come to US land-based casinos after experience with international online slots are often surprised to find the option simply does not exist.
Why US Casinos Do Not Have Bonus Buys
Bonus buy features are not available on any slot machine in US regulated brick-and-mortar casinos. This is not a business decision by the casinos — it is a regulatory prohibition.
The Nevada Gaming Control Board and its counterparts in other US jurisdictions require that game outcomes be determined by a random number generator in a way that does not allow the player to alter the probability of a bonus round through a direct purchase mechanism. Player-initiated bonus triggers conflict with those requirements. State gaming labs that certify slot machines for US floors will not approve a game with an active bonus buy function.
US online gaming is a separate and smaller market. The handful of regulated online casino states (New Jersey, Michigan, Pennsylvania, Connecticut, and a few others) operate under similar technical standards, and bonus buy features remain largely absent even in those markets as of current regulations.
Regulatory Note
Regulations vary by state and change over time. The prohibition on bonus buys reflects the current stance of the major US gaming control boards. If you are researching a specific jurisdiction, check that state's gaming control board technical standards directly.
The Math: Bonus Buy RTP vs. Wait-for-Trigger RTP
A common misconception is that buying the bonus gives you better odds because you are guaranteed the bonus round. The math does not support this.
Slot games are designed with a total game RTP that blends the base game and bonus round contributions. When a developer prices a bonus buy, they calculate the expected value of the bonus round in isolation and then add a house margin on top of that. The result is that:
- The base game RTP (including naturally triggered bonuses) might be 96%.
- The bonus buy RTP on the same game is often 94%–95% — a lower return for the convenience premium.
You are paying extra for immediacy, not for better expected value. Over a large sample the bonus buy costs more per dollar wagered than simply playing through. The variance may feel lower because you get into bonuses faster, but the long-run math is worse.
What US Advantage Players Do Instead
US AP players do not have access to bonus buys, but the underlying goal — getting into a bonus round with a favorable expected value — is achievable through legal play on the right machines.
The two primary tools are:
- Accumulated-state machines: Certain slot machines build internal state across spins — reels fill with stacked symbols, meters climb, or multipliers accumulate. A machine that has been played for a long session without triggering its major feature may be in a high-EV state that the next player can harvest. This is the foundational concept of US slot AP play.
- Must-hit-by progressives: Machines where a progressive jackpot must hit before a published ceiling give the player a known maximum value. When the progressive is close to the must-hit ceiling, expected value is positive on every spin — a near-guaranteed trigger at a favorable price, analogous to what a bonus buy promises but with better math.
Both approaches require identifying machines in the right state, which is exactly what SlotStrat's 150-machine guide library is built to support.
AP Relevance: Setting Expectations
Understanding bonus buys matters for US players primarily as a context-setting exercise. If you have played international online slots, you are accustomed to the option of buying your way into a bonus. When you walk onto a US casino floor that option does not exist, and you should not expect it.
More importantly, the instinct to seek a "guaranteed bonus" is a good one — it reflects the correct AP mindset of wanting to play in +EV situations. The difference is that in the US, you find those situations by reading machine state rather than by paying a premium to a software feature. That is a skill that can be learned, and it is more profitable than a bonus buy because the edge comes from finding value the market has left on the table rather than paying a premium for convenience.
Find machines worth playing — before you spin
SlotStrat's 150 machine guides cover accumulated-state slots and must-hit-by progressives in detail — the US equivalent of a guaranteed bonus trigger, with better math.
Frequently Asked Questions
What is a bonus buy feature on a slot machine?
A bonus buy feature lets a player pay a lump-sum premium — typically 50x to 100x their current bet — to immediately trigger the game's bonus round rather than waiting for it to land naturally on the reels.
Are bonus buy features legal in the United States?
No. The Nevada Gaming Control Board and virtually all other US state gaming regulators prohibit player-initiated bonus triggers on licensed gaming machines. Bonus buy features are not available on any slot machines in US regulated brick-and-mortar casinos.
Why do online casinos outside the US offer bonus buys?
Regulators in the UK, Malta, and much of Europe permit bonus buy features under their licensing frameworks, though some jurisdictions such as the UK have added responsible-gambling restrictions on the feature. International online casino software providers build bonus buys because they serve those markets.
Does a bonus buy give you better odds than waiting for the bonus naturally?
No. The bonus buy RTP is typically lower than the base game RTP because you pay a premium for immediacy. You are essentially buying convenience, not better expected value. The math is built so the house edge on the bonus buy itself is higher than playing through.
What do US advantage players use instead of bonus buys?
US AP players target accumulated-state machines and must-hit-by progressives — situations where a machine's internal state guarantees or strongly favors a bonus trigger within a known range. These are the legal, land-based equivalent of a guaranteed bonus trigger and represent the core of slot advantage play in the US.