A pattern day trader is a regulatory designation for investors that execute four or more day-trades during five business days’ time. The PDT rule applies to margin accounts only. If your margin account receives this designation while it has a net account value below $25,000, an EM call occurs.
If a margin account has $25,000 or more, you will always have unlimited day trade opportunities; it does not matter if your account is flagged with a PDT.
Please note the PDT rule does not apply to cash accounts.