Thanks. But Interactive brokers margin is less ie 40% only right?
Suppose my portfolio is USD 10K wirth They will allow only 14K right? it is too limited.
If 40% leverage is "too limiting", you're either trading LTCM-style fixed-income arb or you have a gambling problem. (Portfolio margin, which you can switch on when you have $100k in your account, lets you leverage up more: usually 5-to-1 or so on large-cap stocks.)
(OK, that's not entirely fair: day-traders might well want to be leveraged up a few times intraday; global macro traders will probably be a couple of times leveraged consistently; and you can get some really excitingly large leverage amounts with short-dated eurodollar futures, where you only have to post $350 of margin on contracts with $1mio notional so technically you're 3,000x leveraged. Leverage is not necessarily evil.)
But if I put USD 10K in CFD, I may able to levarage up to USD 40K total portfolio right here? So 30K USD the interest will be how much in CFD?
The interest will be something like 6-8% p.a., depending on your broker (some quick googling found me
Phillip Sec, which charges 3% on US stocks and indices, but that's a promo rate: normally it's 5.5%). That puts you at a hell of a disadvantage.
That said, because you're in Singapore (anywhere but the US, Australia, and HK), IB will do you CFDs as well, and they
give you pretty generous margining (about 10-to-1 leverage on stocks and 20-to-1 on indices) at the same
generous financing rates they use for cash equities.
If you're really insistent on using CFDs, you might as well stick with IB for those as well.
Obligatory note: one of the things about IBKR is that they are
very diligent with margin monitoring. If you hit your margin limit, they're not going to faff around and put their business at risk by giving you a couple of days to make the margin call: they're going to close you out automatically.
I quite like this, because it means their business isn't going to be put at risk by some overleveraged idiot who can't meet his margin calls. If you run on the ragged edge of margin calls all the time, though, you'll want to go elsewhere.