IB beginner

[d08]

Personally I rarely use margin. But I like and used to trade as follows. I buy 100 MSFT at $20 Monday and pay only 20% of the total $2000, which cost only $400 at the time od execution. Of course I have to pay the rest ($160) in settlement day(Friday) to complete.

This is a lot different from margin, since we never pay ANY INTEREST at all.

Is this Reg-T?

For that you need Portfolio Margin, that requires at least $110K in your account + their approval which you will probably get unless you're a delinquent. Then essentially you get 6:1 leverage

You can have more than 2:1 leverage with Reg T Margin but only for intraday trades, has to be 2:1 for overnight positions.