How do I choose between a Cash, Reg T Margin or Portfolio Margin account?

To avoid the restriction which limits you to 3 day trades over any 5 day moving period, your account must maintain a Securities Net Liquidation Value of at least USD 25,000, where Net Liquidation Value includes cash, stocks, ETFs, funds, bonds and options held in the Securities segment of your account…

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The error message "Your order is not accepted. Minimum of 2,000 USD (or equivalent in other currencies) required in order to purchase on margin, sell short, trade currency or future" means the account balance in your margin account has fallen under USD 2,000.  Margin accounts must maintain a minimum of USD 2,000 (or equivalent in other currencies) of Securities Equity with Loan Value or Commodities Net Liquidation Value to purchase on margin, sell short, trade currencies or futures…

Any open position can be closed by the IBKR Liquidation system when an account is in a margin deficit. To avoid a Liquidation a Reg T Margin account must have positive Excess Liquidity at all times and Positive SMA starting at 15:50 EST which is the start of the Reg T check period. A Margin or Portfolio Margin account must have positive Excess Liquidity at all times. A Cash account must have a positive cash balance at all times…

SMA (Special Memorandum Account) is a line of credit created for Regulation T (Reg-T) margin accounts when depositing funds and when the market value of securities in the account increases. It is important to understand the following key points about SMA:…