MK020, IB would set you up a universal account that pays interest. IB would moves move cash to and from your futures account to cover the exposure in the futures account. You would not have to keep up with the cash movements as long as you have more than adequate cash in your universal account. I have had an account with IB for about 19 years. I trade stocks and futures through IB. I think IB has the best of everything (best company president, best trading platforms, provides a way for FDIC insurance up to $2,500,000.00 on cash above what is covered by SPIC and was paying 1.19 percent as of April 18, 2018, low "all in" commissions, and supper fast executions). Open an account with IB and you will never look back, only forward. I expect to have an account with IB until I die or Tom Peterffy is no longer making the decisions at IB.