Do Forex trades impact the SMA in a Reg T margin account?

Your order either closes an existing position in a Reg-T margin account or reduces the risk based margin requirement in a Portfolio margin account.

For more information, please visit the Margin page of our website…

Market appreciation does add credit to a Reg T account's SMA. At the end of the regular trading day (normally 15:50 US/Eastern), there is a check for the amount of the Reg T Excess (Reg T Excess equals Reg T Equity less Reg T Margin). If the Reg T Excess of a margin account is greater than the previous end of day Reg T Excess then the account receives a credit and SMA and is set equal to the new amount of Reg T Excess. The change to SMA resulting from trades is effectively the change in Reg T Equity minus the change in Reg T Margin…

IBKR Singapore offers both cash and margin account types.

All eligible margin accounts employ a risk-based model similar to Portfolio Margin accounts to calculate margin requirements. Please visit the IBKR website…

You can find the "SMA Rules" by going to the IBKR Margin Education page and scrolling down to “3. SMA and End of Day Calculations”. Once there, click on Real-Time SMA, End of Day SMA and SMA Rules…