Definition
Back Bet
Also known as Backing, Back
By Abhinav VasudevanReviewed Editorial policy
In short
A back bet is a conventional wager on something to happen. The term exists mainly to distinguish it from a lay bet on an exchange, where you can also bet on something not to happen.
Backing is ordinary betting: you pick something, stake money, and win if it happens. Every bet placed with a traditional bookmaker is a back bet.
The word only becomes necessary in the context of a betting exchange, where the alternative, laying, also exists.
Back and lay side by side
| Back | Lay | |
|---|---|---|
| You are betting | For it to happen | Against it happening |
| Your risk | Your stake | The liability |
| You win | (odds − 1) × stake | The backer’s stake |
| Role | Customer | Bookmaker |
Why exchange back prices are better
On an exchange you are matched against another bettor rather than against a bookmaker, so there is no overround built into the price, only commission on net winnings.
The practical difference is significant. A selection at 3.00 with a bookmaker might be 3.25 on an exchange. After 5% commission on winnings, the effective price is about 3.19, still meaningfully better.
The gap widens at longer odds, where bookmaker margin is concentrated, and narrows in illiquid markets where exchange prices are thin.
Back-to-lay trading
Backing at one price and laying at a shorter one locks in profit before the event finishes. Back at 4.00, lay at 2.00, and you have a position that profits regardless of the result.
This is the exchange equivalent of trading rather than betting, and it is how most professional exchange users operate, particularly in-running on racing and tennis, where prices move fast and predictably around key moments.
Common questions
What is the difference between backing and laying?
Backing bets on something to happen and risks your stake. Laying bets against it, puts you in the bookmaker's role, and risks the liability instead. Only exchanges offer both.
Are exchange back prices better than bookmakers?
Usually yes, because there is no overround, only commission on net winnings. A selection at 3.00 with a book might be 3.25 on an exchange, worth about 3.19 after 5% commission. The gap widens at longer odds.