Wagering on Slot Bonuses

What Wagering Requirements Are

A wagering requirement (sometimes called a "playthrough" or "rollover" requirement) is the amount you must bet through a slot site before any winnings from a bonus can be withdrawn. It is expressed as a multiple — typically 10x in the UK post-2023, sometimes lower. A £50 bonus with 10x wagering requires £500 in wagers before withdrawal.

Wagering requirements exist because if operators handed out bonus money with no strings attached, every customer would deposit £10, claim a £50 bonus, attempt to withdraw £60, and the operator would lose money on every customer. The wagering requirement ensures the operator captures back a portion of the bonus through the house edge during the wagering process.

The Maths Behind Wagering Requirements

The expected cost of completing a wagering requirement equals the wagering amount multiplied by the house edge of the slots used. At a 4% house edge (typical for UK slot mix), the expected cost of £500 in wagering is £20. So a £50 bonus at 10x wagering has an expected net value of £50 − £20 = £30.

This is the formula we use throughout SlotMachines: Genuine EV = Bonus − (Wagering × Bonus × House Edge). With house edge fixed at 4%, the formula simplifies to EV = Bonus × (1 − Wagering × 0.04). At 10x wagering: EV = Bonus × 0.6. At 25x: EV = 0. At 35x (pre-UKGC-reform standard): EV is negative.

The UKGC 10x Cap

Before 2023, UK slot bonuses commonly carried 35x, 40x, even 50x wagering. The UK Gambling Commission reviewed online slot harm and concluded that wagering rates above 10x produced bonus offers with negative or near-zero expected value — marketing devices rather than genuine value transfers to players. The 10x cap applies to every UKGC-licensed operator and every operator we recommend follows it.

What Else to Watch For

Wagering rate is the headline term but four more terms affect the practical experience: Maximum bet during wagering (usually £5; bets above the cap forfeit the bonus), Game weighting (some slots count less than 100% toward wagering — usually called out in the T&Cs), Bonus expiry (7 to 30 days; under 7 is restrictive), Maximum cashout (some bonuses cap withdrawable winnings at 5x to 10x bonus amount, regardless of actual wins).

Every operator review on SlotMachines spells these out. We read the T&Cs so you do not have to.