How bonus wagering works
Bonus-only vs deposit + bonus, free-spin wins, and the fine-print traps that change how much you must bet before cashout.
Wagering (playthrough / rollover) is the stake total you must clear on qualifying games before bonus winnings become withdrawable cash. The multiplier on the promo card is only half the story — what that multiplier applies to matters more.
A 10x line on a £100 bonus can mean £1,000 to clear, or £2,000, depending on whether wagering is bonus-only or deposit + bonus. Free-spin deals often wager the winnings, not the face value of the spins. Read the base before you celebrate the number.
Bonus only vs deposit + bonus
Same headline multiplier, very different clear:
| Wagering base | Example | Formula | Total to bet |
|---|---|---|---|
| Bonus only | £100 bonus at 10x | £100 × 10 | £1,000 |
| Deposit + bonus | £100 deposit + £100 bonus at 10x | £200 × 10 | £2,000 |
UK welcome tables often show “10x” or “35x” without spelling out the base. That detail lives in the operator T&Cs — and it is the difference between a manageable clear and a long grind.
Free spins change the math
Spin value (for example 25p per spin) sets how much you can win from the promo, not a fixed bonus balance you must roll. If you win £10 from those spins and wagering is 10x on spin winnings, you need £100 of qualifying bets — not 10× the theoretical spin face value.
| What you might assume | What usually applies | Clear |
|---|---|---|
| Face value of spins | 50 × 25p = £12.50, then × 10 | £125 (often wrong) |
| Actual spin winnings | £10 won from the spins × 10 | £100 |
That is why a modest free-spin win with low wagering on winnings can be easier to cash than a large deposit match with high rollover on bonus + deposit.
Traps that still bite
- Game weighting: slots usually contribute 100%. Blackjack, roulette, or live games may contribute 10% or 0% — a £10 bet might clear only £1 of wagering.
- Max bet while clearing: many offers cap stakes (often around £2–£5 per spin). Oversized bets can void the bonus even if you “clear” the total faster.
- Win / cashout caps: low-wager or “no wagering” spin deals often cap what you can withdraw from the promo (for example £50 or £100). Clearing wagering does not lift that ceiling.
| Trap | Typical detail | Why it matters |
|---|---|---|
| Game weighting | Slots 100%; tables 10% or 0% | £10 roulette bet may clear only £1 |
| Max bet | Often £2–£5 while bonus is active | Big stakes can void the promo |
| Win / cashout cap | e.g. £50 or £100 from spins | Ceiling stays even after playthrough |
Example 1 — low-wager free spins
Offer: 50 free spins at 25p, with 10x wagering on spin winnings.
| Step | Figure |
|---|---|
| Spins claimed | 50 × 25p |
| Winnings from those spins | £20 |
| Wagering base | £20 (wins only) |
| Multiplier | 10x |
| Total to bet before cashout | £200 |
You are not wagering 50 × 25p × 10. The win amount is the base.
Example 2 — bonus-only deposit match
Offer: 100% match up to £100, 35x on the bonus only. You deposit £100 and receive a £100 bonus.
| Step | Figure |
|---|---|
| Your deposit (cash) | £100 |
| Bonus credited | £100 |
| Wagering base | £100 bonus only |
| Multiplier | 35x |
| Total to bet before bonus → cash | £3,500 |
Cash and bonus often sit in separate wallets until playthrough is done. Your own £100 deposit is not part of that multiplier — though other rules (eligible games, max bet, KYC) still apply.
Example 3 — deposit + bonus (same headline, harder clear)
Same looking offer: 100% up to £100 at 35x, but the fine print says wagering applies to deposit + bonus.
| Step | Figure |
|---|---|
| Deposit + bonus pool | £100 + £100 = £200 |
| Multiplier | 35x |
| Total to bet | £7,000 |
Twice the playthrough of Example 2 for what looks like the same promo on a comparison table.
Side-by-side: what you think vs what you clear
| Promo type | What the card suggests | Actual formula | Total wagering target |
|---|---|---|---|
| Example 1 (spins) | 10x on spins | £20 wins × 10 | £200 |
| Example 2 (bonus only) | 35x on the bonus | £100 × 35 | £3,500 |
| Example 3 (deposit + bonus) | 35x on the card | (£100 + £100) × 35 | £7,000 |
Why high wagering is hard to clear — slot RTP
Slots carry a built-in house edge. A typical UK online slot sits around 96% RTP (return to player) — a long-run average, not a promise for your session. Over enough spins the game is designed to pay out about 96% of stakes and keep about 4%.
Apply that to Example 2’s £3,500 playthrough on a 96% RTP slot:
| Metric | Calculation | Result |
|---|---|---|
| Expected return | 96% of £3,500 | £3,360 |
| Expected loss (house edge) | 4% of £3,500 | £140 |
| Bonus that created the clear | — | £100 |
That expected loss (£140) is larger than the £100 bonus that created the requirement. On average, the math leans toward the bonus balance running down during the clear — which is why high multipliers are a real cost, not just a number on a promo card.
Volatility means you will not land on the average every time:
| Path | What happens | Likely wallet outcome |
|---|---|---|
| The grind (common) | You work through the £3,500 and the bonus hits £0 before wagering finishes | Mostly remaining cash deposit (if it was separate) |
| The cushion (less common) | An early big hit builds a buffer that absorbs the ~£140 expected drag | You can finish with a withdrawable balance above the bonus alone |
RTP does not tell you which path you will get on any one bonus. It explains why clearing 35x on a £100 match is usually tough even when the headline looks generous.
When you compare welcome offers on Casino BonusRush, treat the wagering line as a starting point. Check whether it is bonus-only or deposit + bonus, whether free-spin wagering sits on winnings, and whether game weighting or a max win cap shrinks the real value. Always confirm the live operator terms before you deposit.
For the flip side — offers with no playthrough at all — see What “no wagering” means.
