How do I upgrade my cash account to a margin account?

Overview: 

Requests to have an account upgraded from a 'Cash' type to 'Margin' type can be initiated by logging into Account Management and selecting the Settings and Account Settings sections and clicking the gear icon next to the words "Account Type" in the Configuration section. IBKR offers two margin types: the standard Reg T Margin and Portfolio Margin. Note that as Portfolio Margining generally provides for greater leverage, accounts must report minimum net liquidating equity of at least USD 110,000 to qualify for this margin treatment and USD 100,000 in order to enter margin increasing transactions.

Also note that requests for margin upgrades are subject to a Compliance review to ensure that the account holder maintains the appropriate qualifications. This review typically takes between 1 -3 business days to complete.