Betfair sometimes offer net winnings boosts to some customers. You’ll be notified by email if you’ve received one of these offers. They can be for different amounts, but the most common is a 100% winnings boost up to £50. There are two main options for taking advantage of this offer. Whichever option you use, it’s important that you place only one exchange bet during the qualifying period, so you can make sure your net winnings/losses are exactly right.

## Back bet at low odds

The simplest way to use the offer is to place a Betfair exchange back bet on a very likely outcome that will return £50 if it wins. Find a close match and lay the bet on smarkets as normal. If it wins, you’ll receive an extra £50 of cash winnings, minus your qualifying loss from the lay bet.

You can use the following equation to work out the stake you need to lay to return exactly £50 of profit:

Required Stake = Target Winnings / ( ( Decimal Odds – 1 ) x 0.95 )

The disadvantage of this method is that if the back bet loses, you gain nothing and take a qualifying loss.

Example

Top-of-the-table Barcelona play mid-table Getafe and are strong favourites to win. You find a close match, allowing you to back Barcelona to win at 1.13 on Betfair exchange and lay at 1.13 on smarkets exchange.

First, work out how much you need to bet on Barcelona to return £50 of winnings:

Required Stake = Target Winnings / ( ( Decimal Odds – 1 ) x 0.95 )

= £50 / ( ( 1.13 – 1 ) x 0.95 )

= £404.86

Now you’ve worked out the back stake you need to place, enter it into the Yesbets calculator to work out the required lay.

As you can see from the screenshot, backing and laying this stake at these odds will incur a qualifying loss of £3.27. However, if Barcelona win – which is very likely – you’ll get a £50 bonus and make a net profit of £46.73. In the unlikely event that Barca lose or draw, though, you’ll just make a £3.27 loss.

## Back bet with lock-in

You can lock-in profit on this offer by placing a Betfair exchange back bet and calculating boosted odds to account for the 100% bonus. This is will lock-in profit regardless of outcome. Look for a close match and lay the bet of smarkets.

Use the same equation as above to calculate the stake required to return £50 of profit. You can then use the Odds Booster calculator from the top bar, or use the following equation to calculate 100% boosted odds:

Boosted Odds = ( ( Decimal Odds – 1 ) x 2 ) + 1

Once you’ve done this, simply add the stake you calculated and the boosted odds into the manual matched betting calculator to work out your required lay.

The advantage of this method is that it returns profit regardless of outcome, though you make less if the back bet wins than you would’ve if you’d used the first method.

Example

Chelsea play West Brom at home. You find a close match and can back Chelsea to win at on Betfair exchange at odds of 1.4 and lay on smarkets exchange at 1.4.

First, work out how much you need to back to return £50 of winnings:

Required Stake = Target Winnings / ( ( Decimal Odds – 1 ) x 0.95 )

= £50 / ( ( 1.4 – 1 ) x 0.95 )

= £131.58

Next, use the Odds Booster calculator to work out the 100% boosted odds:

Finally, enter your boosted odds and back stake into the matched betting calculator to work out the required lay stake and lock-in profit: