A £100 bonus with a 40x wagering requirement does not hand you £100 to spend. It hands you a target. You need to stake £4,000 before a single penny of that bonus turns into cash you can withdraw. You find this out at the withdrawal screen, which is the worst place to learn it.
Casinos sell welcome offers with the biggest number on the page, then attach conditions that decide whether you ever see the money. The banner figure sells the sign-up. The terms decide the payout, and they sit three clicks away. The gap between what a bonus promises and what it delivers comes down to four or five numbers buried in the small print.
Wagering, also called playthrough, is the total you must stake before a bonus becomes withdrawable cash. Casinos write it as a multiple. A 30x requirement on a £50 bonus means £1,500 in stakes. A 40x requirement on a £100 bonus means £4,000. Those totals arrive before you have counted a single game weighting rule or time limit.
One detail changes everything: whether the multiple applies to the bonus alone or to the bonus plus your deposit. Deposit £50, take a £50 match at 35x on the bonus only, and your target sits at £1,750. Apply the same 35x to the deposit and bonus combined and the target doubles to £3,500. Identical headline, twice the work.
The gap between those two totals is the real cost of a bonus, and no banner mentions it. A 5x difference in the base multiple looks small on a comparison table. On a £200 bonus it moves your target by £1,000.
Bets do not count the same. Slots count at 100% at most sites, so £1 staked cuts £1 from your target. Table games count less. Blackjack, roulette and baccarat sit between 10% and 20% at UKGC-licensed casinos, and a few operators keep them out of wagering altogether.
Take that £1,750 target and clear it on roulette at 10% weighting. You now need £17,500 in bets. The same money staked on a qualifying slot clears the target at full value. Weighting tables live in the bonus terms, a long list of game names with a percentage beside each one, and the percentages decide how long you sit at the screen.
Live roulette and live blackjack count at 10% or nothing. Move to live tables after reading a 100% slots weighting and you grind a target ten times larger than the one you planned for. Check the weighting table before your first bet rather than after your fiftieth.
Max bet rules appear in almost every UK bonus. The cap sits at £5 per spin or hand at most sites, sometimes £2.50. Break it once, even on an auto-spin setting you forgot to change, and the operator can void your bonus and every win it produced. Find the cap and set your stake underneath it.
Time limits slice next. A 30-day window sounds generous until you run the arithmetic. Clearing a £4,000 target at £1 stakes takes hours of play across several sessions. A 7-day window makes the same target close to impossible for anyone with a job or a family.
Then come the clauses that shrink payouts, which cap what a bonus can convert into. Plenty of offers limit your maximum win to £100 or twice your deposit, no matter how large the balance grows. Land a £2,000 win off a £50 bonus with a £100 cap and you withdraw £100.
Operators write the maximum win clause into the same block of text as the wagering rule, which is how the small print trims winnings you believe you have already banked. A capped conversion turns a strong session into a modest one, and the cap applies whether you win big on your first spin or your five hundredth.
Free spin offers look simpler than a matched deposit, and they carry their own conditions. Every spin holds a fixed value, often 10p, and the winnings land in your bonus balance with a wagering multiple attached. Fifty spins at 10p produce £5 of potential winnings at best, and a 40x multiple on that turns into a £200 staking target. Some offers expire the spin winnings inside 24 hours. Read the value per spin and the multiple before you count the spins as a prize.
Put a 65x multiple, a 5-day clock and a £50 maximum win behind a big headline figure and you have a dud bonus offer. You stake thousands, you convert almost nothing, and the house keeps the difference. A smaller match at 25x with a generous time limit will pay you more often than a flashy one with terms stacked against you.
Cash and bonus funds sit in separate balances at most sites. Some drain your cash first, others spend the bonus first, and the order decides which money pays for which bet. Check what happens to bonus funds before you deposit, because converting the wrong balance can leave a bonus stuck behind a target you cannot reach.
Start with the wagering multiple. Find whether it applies to the bonus alone or to the deposit plus bonus. Open the weighting table and note the slot percentage. Find the max bet cap and the time limit. Find the maximum win clause. Five numbers, and together they tell you whether the offer pays or just looks like it does.
If a site buries those numbers or writes them in language built to confuse, treat that as your answer and move on. UKGC-licensed operators such as GOKong Casino print the wagering multiple and the weighting table on the bonus page itself, so you can compare two offers without opening a support chat.
Different operators word the same rules in different ways, so a comparison only works once you can translate the phrasing. A guide to UK bonus terms in plain English helps here, and it takes less time to read than one bonus page's small print.
Comparison takes ten minutes once you know which figures to pull. Write them down side by side: multiple, weighting, cap, clock, maximum win. The offer with the lowest multiple and the longest clock wins most of the time, even when its headline number is the smaller one.
If chasing a wagering target pushes you to stake more than you planned, step back. Deposit limits, time-outs and tools such as GamStop and GamCare exist for that moment, and using them costs you nothing.
A bonus is a loan of the casino's money against a staking target. Treat the multiple, the weighting, the cap and the clock as the price, and the offers worth your time become obvious. The next banner promising £100 will show its real value in the terms, and you know where to look.