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I'd start with an amount where losing it wouldn't affect your normal finances. The important part isn't finding some minimum number that guarantees you can trade properly.  I'd also separate the amount you're willing to risk from the amount you're technically able to deposit. If losing the whole trading balance would create financial problems, it's probably too much.  There are some useful points about funding an account, leverage and the actual costs of day trading here: https://mantelligence.com/three-findings-before-starting-day-trading/.