If you spend time in online casinos, you have almost certainly seen the button. Usually labelled something like “Buy Feature,” “Bonus Buy,” or “Feature Buy,” it sits on the game screen next to the standard spin button and promises to skip straight to the most exciting part of the slot – the bonus round – for a fixed price. No waiting through hundreds of base game spins hoping the feature triggers. Just pay the premium and you are in.
The concept is simple enough, but the math behind it and the practical implications for your bankroll are more nuanced than they appear. This guide covers everything you need to know about bonus buy slots – how they work, what the real cost is, and whether they make sense for how you play.
What Bonus Buy Slots Actually Are
Bonus buy slots are games that include a mechanic allowing players to purchase direct access to the bonus round rather than waiting for it to trigger organically through base game play. The feature was introduced by a handful of developers around 2018 and has since become standard across most major studios including Pragmatic Play, Big Time Gaming, Hacksaw Gaming, and Push Gaming.
The bonus round in a slot is where the highest-value outcomes are concentrated. Free spins with multipliers, expanding wilds, sticky symbols, and other high-variance mechanics typically only activate in the bonus phase. In a standard slot, triggering this feature might require anywhere from 50 to 200+ base game spins on average. The bonus buy option skips that wait entirely – at a cost.
How the Pricing Works
The price of a bonus buy is almost always expressed as a multiple of your current bet size. Common pricing is between 50x and 100x your stake, though some games go higher. A player betting $1 per spin on a game with a 80x bonus buy price would pay $80 to purchase the feature directly. A player betting $5 per spin on the same game would pay $400.
The price is not arbitrary. Game developers calculate it based on the expected value of the bonus round at that stake level. If the bonus round has an average payout of, say, 80x the stake, the buy price will be set near that expected value – meaning the bonus buy is approximately a zero-sum transaction in expected value terms, before accounting for the house edge applied to the feature purchase itself.
The Math: RTP on Bonus Buys vs Base Game
This is where it gets important for anyone who thinks about their play in terms of value. Most slots have a headline RTP (Return to Player) figure that covers the entire game. However, many jurisdictions and responsible developers now separately disclose the RTP for the bonus buy feature specifically. This RTP is almost always lower than the base game RTP.
The reason is straightforward: the bonus buy removes variance from the operator’s perspective. Instead of waiting through variable numbers of base game spins to reach the feature, the player is paying a fixed premium for guaranteed access. That premium is priced to include a margin for the house. Typical bonus buy RTPs run between 94% and 96%, compared to base game RTPs that might be 96% to 97%. The difference is small in percentage terms but meaningful over volume.
Understanding RTP differences across game modes is exactly the kind of analysis that separates informed players from those who simply chase the excitement of the feature. Resources like the bonus buy slots guide break down individual games with RTP figures for both standard and bonus buy modes, volatility ratings, and maximum win potential – the data points that matter when deciding whether a particular game’s feature purchase is worth the premium at your stake level.
High Volatility and Bankroll Requirements
Bonus buy slots are almost universally high-volatility games. The bonus round delivers outcomes across a very wide range – from just covering the buy cost to returning 1000x or more the stake in exceptional sessions. This variance has direct implications for bankroll management. A player who buys the bonus multiple times in a session needs a substantially larger bankroll to absorb the natural variance without going bust before hitting a significant win.
The general rule applied by experienced high-volatility players is to have at least 20-30 bonus buys worth of bankroll before starting a session where bonus buying is the primary strategy. At a $80 buy price, that means $1,600 to $2,400 minimum bankroll. At $400 per buy, the numbers become significant very quickly. This is not a conservative play style – it is a high-risk, high-reward approach that requires both the bankroll and the stomach for it.
Where Bonus Buys Are Restricted
One practical consideration that often catches players by surprise is geographic restriction. The UK Gambling Commission banned bonus buy features in 2019, citing concerns about accelerated play and the feature’s appeal to problem gamblers who might impulsively spend large sums to access the bonus round immediately. Several other European jurisdictions have followed with similar restrictions.
This means that players in the UK, and in some other regulated European markets, will find that bonus buy buttons are greyed out or absent entirely even when playing titles that include the feature in other markets. Operators serving multiple jurisdictions maintain region-specific game configurations that disable the feature where it is prohibited while keeping it available elsewhere. If you are seeing a bonus buy button, you are in a jurisdiction where it is currently permitted.
Whether Bonus Buys Are Worth It
The honest answer is: it depends on what you are optimising for. If you are optimising for entertainment time per dollar spent, bonus buys are almost certainly not the best choice. The lower RTP on the feature purchase, combined with the high cost per play, means your bankroll depletes faster than in standard base game play.
If you are optimising for the experience of playing the bonus round itself – the high-variance, high-excitement phase of the game – and you have the bankroll to support multiple attempts, bonus buys deliver exactly what they advertise. They remove the often-tedious base game waiting period and put you directly into the part of the game that most players are there for.
The value calculation is ultimately personal. Treat the bonus buy premium as the price of admission to the feature experience rather than as a bet you expect to profit from in the long run, and you will have a much clearer picture of whether it makes sense for you.
The Bottom Line
Bonus buy slots are a genuine product innovation that solves a real problem for a specific type of player – one who wants the high-variance feature experience without grinding through base game spins to get there. The trade-off is a slightly lower RTP on the feature purchase and significant bankroll requirements to play the format sustainably.
For sports bettors crossing into casino play, the parallel is straightforward: bonus buying is like a parlay. Higher variance, higher potential upside, requires appropriate bankroll management, and only makes sense if you understand the math and have sized your exposure correctly. Go in knowing the numbers and it is a perfectly legitimate way to play. Go in purely on impulse and the house edge will find you quickly.
