Free spins bonuses explained

The casino gives you a set number of spins on a named slot at a fixed stake, often the game's minimum. Some offers need a deposit first. Some don't. A few are wager-free, meaning winnings land as cash.

Many land as bonus funds. Bonus money sits in a separate balance with its own rules, and you can't withdraw it until you've met them. The UK Gambling Commission's consumer guidance says operators should make it clear if you're playing with your own money or with bonus funds, and should let you keep what's left of your deposit plus any winnings made from it. In other words, your own cash shouldn't be trapped by a bonus you opted into.

The spin stake matters more than the spin count. Fifty spins at €0.10 are €5.00 of play. Twenty spins at €0.50 are €10.00. Always multiply.

Wagering (also called playthrough) is a multiplier. If your spins win €4.80 in bonus funds and the wagering is 10x, you must place €48 of bets before that bonus can turn into withdrawable cash.

Two details change everything:

• What gets multiplied. Wagering on spin winnings only is far lighter than wagering on deposit plus bonus. Read which one it is.
• The house edge keeps working while you wager. Every bet you place to clear the bonus loses a little on average. On a 96% RTP slot, wagering €48 costs about €1.92 on average. The higher the multiplier, the more of the bonus the edge eats before you finish.

In Great Britain the rules changed this year. The Gambling Commission decided to cap wagering requirements on bonus funds at ten times, and to ban promotions that mix product types, such as casino and betting in one offer. Both took effect on 19 January 2026. That cap is a British rule. A site licensed somewhere else isn't bound by it, so read every offer's number yourself.

Max cashout. Many free spins offers cap what you can withdraw from them. Anything above the cap is removed when you cash out. If the cap is low, a big hit on the spins is mostly wiped. Check the cap before you decide the offer is worth your time.

Expiry. There are usually two clocks. One for using the spins, one for finishing the wagering. Miss either and the bonus goes. Short windows push you to play more, and faster, than you planned. That's the point of them.

Game restrictions. The spins are tied to one slot. The wagering often has its own list of allowed games, and some games may count for less than 100% of each bet or not at all. Bonus buys can be excluded too.

Max bet while wagering. Terms often limit your stake while a bonus is active. Go over it, even once, and the casino may void the bonus and the winnings. The Commission's guidance says firms should be clear about restrictions like bet size, so the limit should be in the terms. Find it.

The Advertising Standards Authority's advice to marketers says the significant conditions (eligibility, deposit or wagering requirements, time limits) have to be communicated clearly, and that an offer shouldn't be called "free" if you must risk your own money to qualify. Worth remembering when the word free is the biggest thing on the page.

None of these figures describe a real offer. They're picked to show the arithmetic.

Say a casino gives 50 spins at €0.10 on a slot with a 96% RTP. That's €5.00 of spins, and on average spins like that return €4.80. Assume they return exactly that: €4.80 in bonus funds. The terms say 35x wagering on spin winnings, a €20 max cashout, a €2 max bet while wagering and seven days to finish.

• Amount to wager: €4.80 x 35 = €168.
• Expected cost of wagering €168 at 96% RTP: 4% of €168 = €6.72.
• Expected cost (€6.72) is bigger than the balance (€4.80). On average, the bonus is gone before the wagering is done.

Now the same spins at 10x, the British cap:

• Amount to wager: €4.80 x 10 = €48.
• Expected cost: 4% of €48 = €1.92.
• Expected balance left at the end: €4.80 minus €1.92 = €2.88, under the €20 cap.

Same spins, very different value. And these are averages. A real run might bust in ten bets or hit something big, in which case the €20 cap kicks in. One more thing the example hides: if the wagering slot is high volatility, the chance of busting before you finish goes up.

Open the full terms, not the banner. Then look for these, in this order:

1. The spin value and the named slot. Multiply to get the real value.
2. The wagering multiplier, and whether it applies to winnings, bonus or deposit plus bonus.
3. The max cashout.
4. Both expiry windows.
5. The max bet while wagering, and the list of excluded games.
6. Whether your own deposit is locked while the bonus is active.

If any of these is missing or vague, skip the offer. Honestly, if you wouldn't play that slot at that stake without the bonus, skip it too. And never deposit more than you'd planned to spend just to unlock spins.

The UK's Competition and Markets Authority has pushed firms on this before. In 2018 it secured commitments from operators including BGO Entertainment not to require players to play several times before withdrawing their own money, and to flag significant restrictions prominently. If terms feel designed to catch you out, the CMA's own phrase for that was "terms that could be used to catch players out".