Day traders working the U.S. stock market is required to have a minimum account balance of at least $25,000, according to rules issued by the U.S. Security and Exchange Commission.
If your day-trading account falls below the $25,000 threshold, you won't be able to day trade stocks until the $25,000 minimum account balance is restored.
Thus, it's highly advisable for newly-minted day traders to maintain an account balance well in excess of $25,000 - aim for at least $30,000 in your account when you begin day trading.