Margin — the difference between the cost of your product and its selling price, or ration of profit to revenue. In financials, a margin is the money borrowed from a brokerage to buy securities. The amount you can borrow to invest vary from lender to lender. In Singapore, the limits for cash deposits usually equal 2.5x of what you can deposit. If you bring S$100,000 you can invest up to S$250,000. If you deposit shares, the limit goes up to 3.5x. So the same S$100,000 would allow you to invest up to S$350,000. Your accounting company in Singapore can help calculate limits for marging trading for your company.