Working Out the Real Cost of Clearing a Wagering Requirement
A large advertised match percentage says little on its own about whether a bonus is favourable. What matters is the bonus amount, the wagering requirement, the sum that wagering applies to, the average house edge of eligible games, game-contribution rules, time limits and any maximum-withdrawal cap.
A simplified long-run estimate can be built from two lines:
Estimated theoretical loss = required wagering × house edge
Approximate bonus edge = bonus amount − estimated theoretical loss
The first line estimates the theoretical loss expected over the long run from the total amount staked. The second line only applies where wagering is on the bonus alone and no other restrictive terms materially change the result. Both are simplified educational estimates. They do not predict any player's outcome and do not guarantee a profit.
Example 1: Low Multiplier on a Bonus-Only Basis
A player deposits £50 and receives a £50 bonus. Wagering applies to the bonus only, at 20x. Required wagering is £50 × 20 = £1,000. The eligible games have an average RTP of 97%, so the house edge is 100% − 97% = 3%. Estimated theoretical loss is £1,000 × 3% = £30. Approximate bonus edge is £50 − £30 = £20, a positive figure under these simplified assumptions.
Example 2: A Result Close to Break-Even
A player deposits £80 and receives a £40 bonus. Wagering applies to the bonus only, at 25x. Required wagering is £40 × 25 = £1,000. Average RTP on eligible games is 96%, giving a house edge of 4%. Estimated theoretical loss is £1,000 × 4% = £40. Approximate bonus edge is £40 − £40 = £0, so the estimated cost of clearing the offer roughly cancels out the bonus itself.
Example 3: Wagering on Deposit Plus Bonus
A player deposits £100 and receives a £100 bonus. Here wagering applies to deposit plus bonus, at 35x, so the applicable base is £200. Required wagering is £200 × 35 = £7,000. Average RTP is 95%, so the house edge is 5%. Estimated theoretical loss is £7,000 × 5% = £350. Approximate bonus edge is £100 − £350 = −£250. Because the wagering base includes the deposit, the formula serves only as a rough indicator here, and it points to a clearly negative edge.
This model loses accuracy once real terms are added. Game contribution below 100% raises the turnover needed, RTP can differ between eligible games, a maximum cashout can cap any upside, deposit-plus-bonus wagering multiplies the cost, and an unmet time limit can void the bonus entirely. If a promotion or balance is held in a volatile cryptocurrency, its GBP value may shift between crediting, wagering and withdrawal; stablecoins reduce price movement but do not replace reading the terms. RTP is a long-run statistical average, and short sessions can produce very different results.