Portfolio Margining accounts reporting net liquidating equity below USD 100,000 are limited to entering trades which serve solely to reduce the margin requirement until such time as either: 1) the equity increases to above 100,000 or 2) the account holder requests a downgrade to Reg T style margining through Client Portal (select the Settings, Account Settings, Configure and Account Type menu options).

If a Portfolio Margining eligible account reporting net liquidating equity below USD 100,000 enters an order which, if executed, would serve to increase the margin requirement, the following TWS message will be displayed: "Your order is not accepted, margin requirement increase not allowed. Equity with loan value is less than 100,000.00 USD." 

IMPORTANT NOTICE
 

Please note that requests to downgrade to Reg. T will become effective the following business day if submitted prior to 4:00 ET.  Also note that as the Reg. T margining methodology generally affords less leverage than does Portfolio Margining, requesting a downgrade may lead to the automatic liquidation of positions in your account in order to comply with Reg. T.  You will receive a warning message if that is the case at the time you request the downgrade.