With a 40% best-day rule, you must ensure that no single trading day exceeds more than 40% of your total generated profits. This feature was introduced to reward consistency, and discipline, and promote responsible trading behavior, which can be beneficial for E8 Traders and E8 Markets in the long run.

On evaluation your profit should not exceed 40% of the total profit target in one single day, otherwise, the profit target is increased by the amount you made extra. Ideally, you want to make 40% of the profit target each day.
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In case your profit target is $3,000, your ideal profit to make is $1200 per day ( 40% of your profit target). However if one of your best days is $1,500, your profit target is increased to $3,750 USD (Best day amount / 0.4 (best day rule (40 %))
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In this example, it is $1,500 / 0.4 = $3,750
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Example Scenario number 1:

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Day 1 - $ 1,100 profit

Day 2 - $ 900 profit

Day 3 - $ -400 loss

Day 4 - $1,500 profit

Total generated profit: $3,100
40% of the total generated profits: $1240
Best day: $1,500
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Since 40% of the total generated profit is $1240 and your best day is $1,500 you won't be able to request a payout or complete your profit target and you will have to keep trading until 40% of the total generated profit is higher than your best day.

Example Scenario number 2:

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Day 1 - $ 500 profit

Day 2 - $ 550 profit

Day 3 - $ -50 loss

Day 4 - $ 600 profit

Day 5- $ 400 profit

Total generated profit: $2,000
40% of the total generate profits: $800
Best day: $600
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Since 40% of the total generated profit is $800 and there is no single day that this profit is exceeded, you would be able to request your payout or finish your evaluation.