Lay betting explained

The mental model

A back bet says 'this will happen'. A lay bet says 'this won't happen'. When you back with the bookmaker and lay the same selection on an exchange, you've covered both possibilities. Whichever side is right, one bet wins and one loses — the sizes are calibrated so the net position is a tiny loss (qualifier) or a predictable profit (free bet).

Traditionally, only bookmakers laid bets. The exchange was invented to let ordinary users take that role.

Reading the lay price

The lay column (usually pink) shows the odds someone else is willing to back at. Those are the prices you can lay at. Lay stake is the amount you'll win if the selection doesn't happen. Liability is the amount you'll pay if it does.

Higher lay odds mean higher liability for the same lay stake. That's why beginners are surprised at how much liability a lay at 8.0 requires — a £10 lay at 8.0 has £70 of liability.

Formulas — you don't need to memorise these, but seeing them once helps

• Liability = lay stake × (lay odds − 1).
• If lay wins (selection doesn't happen): you gain lay stake × (1 − commission).
• If lay loses (selection happens): you pay liability.
• For matched betting the calculator handles all of this. Use it every time.

Placing a lay in practice

1. In the exchange interface, click the pink lay column on the selection you want to lay.
2. Enter the lay stake (from the calculator) — NOT the liability.
3. Confirm the odds. Some exchanges auto-fill the best available; others allow you to enter your own price.
4. Place the bet. Confirm it shows as 'matched' (all liquidity found) and not 'unmatched' (nobody took your price). Unmatched bets don't hedge anything — recalculate at the new price.

Common mistakes

• ✕Entering the liability where the lay stake goes (a huge over-bet).
• ✕Laying a market with no available volume at the shown price.
• ✕Choosing the wrong selection to lay — always cross-check against the bookmaker back bet.

FAQs

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