Casino Bonuses and Wagering Explained

The headline number is the least useful part of an offer

A welcome offer is usually advertised as a percentage and a ceiling: 100% up to 500 pounds, say, sometimes with free spins attached. That tells you almost nothing about what the offer is worth, because it describes what you are given rather than what you have to do to keep it.

The number that decides that is the wagering requirement. Everything else on this page follows from it.

What a wagering requirement actually is

A wagering requirement is a multiple of the bonus, and sometimes of the bonus plus your deposit, that you must stake before bonus winnings can be withdrawn. It is written as 35x, 40x and so on.

The distinction between those two bases matters more than the multiple itself. A 35x requirement on bonus only, with a 100 pound bonus, means 3,500 pounds of staking. The same 35x applied to deposit plus bonus, with 100 pounds of each, means 7,000 pounds. Identical advertising, double the obligation.

Staking is not the same as spending. Each time you place a stake it counts toward the requirement, and winnings you re-stake count again. But every cycle through the game gives the house its edge, so a large requirement reliably erodes the balance even when nothing dramatic goes wrong.

Game weighting is where offers quietly become unachievable

Not every game contributes equally. Slots typically count 100%. Table games often count far less, and some are excluded entirely.

If blackjack contributes 10%, then 100 pounds staked on blackjack reduces a wagering requirement by 10 pounds. A 3,500 pound requirement becomes 35,000 pounds of actual blackjack staking. That is not a fine-print detail; it is the difference between an offer being realistic and being decorative.

Check the weighting table before you opt in, not after. It is normally in the promotion terms rather than the main terms.

The terms that decide whether an offer is worth taking

• Wagering multiple, and whether it applies to bonus only or deposit plus bonus.
• Game weighting, including any games excluded outright.
• Time limit. Requirements commonly expire in 7 to 30 days, and an unmet requirement usually forfeits the bonus and anything won with it.
• Maximum stake while a bonus is active. Exceeding it can void the bonus even though the site allowed the bet.
• Maximum conversion, which caps what bonus winnings can become regardless of what you actually win.
• Minimum qualifying deposit, and which payment methods are excluded. E-wallets are frequently excluded from welcome offers.

Free spins are a bonus with extra steps

Free spins usually produce bonus funds rather than cash, and those funds then carry their own wagering requirement. A hundred free spins can look substantial and convert to very little.

Two figures decide the real value: the stake value of each spin, often 10 or 20 pence rather than your normal stake, and the wagering applied to whatever the spins win. Both are in the terms.

What operators are required to do

Bonus terms are not unregulated. A joint investigation by the Competition and Markets Authority and the Gambling Commission, concluded in 2018 after more than a thousand consumer complaints, forced changes across the industry.

The most important outcome for you: an operator cannot impose playthrough requirements on your OWN money. You are entitled to withdraw your own funds and winnings made from them at any time, however little you have played. If a site tells you that you must wager your deposit before withdrawing it, that is not a normal term.

Operators must also communicate significant terms clearly and promptly, so that you can decide whether to participate before you opt in. Eligibility limits, time limits, minimum deposits, maximum stakes and maximum bonus all count as significant.

Further reform is in progress. Following the 2023 gambling White Paper and a Gambling Commission update in March 2025, changes including restrictions on mixed-product offers and caps on wagering requirements have been scheduled. Because implementation dates in this area have moved before, check the current position rather than relying on any single article, this one included.

When the sensible answer is to decline the bonus

Most sites let you opt out of a welcome offer. That is often the better choice, and it is rarely presented as one.

Playing with your own money means no wagering requirement, no maximum stake rule to breach accidentally, no time limit, no maximum conversion, and the ability to withdraw whenever you want. If the requirement is high, the weighting is unfavourable, or the window is short, declining is not leaving money on the table. It is refusing an obligation priced above what it gives you.

A short worked example

Deposit 100 pounds, receive a 100 pound bonus at 35x on bonus and deposit combined. The requirement is 7,000 pounds of staking, restricted to slots, inside 14 days, with a 5 pound maximum stake while the bonus is live.

At 5 pounds a spin that is 1,400 spins to clear, which at the regulated minimum 2.5-second slot cycle is close to an hour of uninterrupted play, before any pause for thought. The house edge applies to all 7,000 pounds of it, not to your original 100.

Stated that way, the offer is legible. Stated as 100% up to 500 pounds, it is not. That difference is the entire reason this page exists.

Keep it in proportion

A bonus is a marketing cost designed to increase how much you play, and the terms are written to make that likely. Understanding them makes you a better-informed customer; it does not change the mathematics of the games.

If gambling has stopped being entertainment, the National Gambling Helpline is free, confidential and open 24 hours a day on 0808 8020 133.