A rollover happens when the settlement of a trade rolls over to the next value date. The cost of this process is based on the interest rate differential that is between the two currencies. If you have any positions open at 5pm EST, then there is a daily interest rate rollover that either you will have to pay or you will end up earning. It all depends on your margin and position in the market. If you don't want to earn or pay interest on your position, then you need to make sure that your positions are closed by 5pm EST. This time is the established end of the market day.
Every single currency trade involves the trader borrowing one currency to buy another currency. This means that interest rollover charges are a necessary part of foreign currency trading. This interest is paid on the currency that you borrow and it is earned on the currency that you buy. If the investor buys a currency that has a higher interest rate than the one they are borrowing, then the investor will make a profit as a result. The investor must be on a 2% margin in order to earn that profit, though.
Now you can take your knowledge of rollovers and put it to use in your trading. Before the close of the market day, decide if you want to close your positions. Closing them may prevent you having to pay the interest rate, but it can also stop you from earning funds from those same interest rates.
Unlike in stock markets, the margin deposit isn't a down payment on the purchase of equity. Instead, it is a good faith deposit. This margin allows the traders to hold a position much larger than their account value. If the funds in the account happen to fall below the margin requirements, then your broker may close some or all of your open positions. This will prevent your account from falling into a negative balance, even in a fast moving market.
In simple terms, the margin is the amount of cash that you deposit into your account. This is there to cover any potential losses. How much money you should have in your account depends on what the margin requirement is. For example, if you want to buy $1 million USD/JPY, then you will need to have $20,000 U.S. Dollars in your account if the margin requirement is at 2%.
This is just an added protection for you. You don't want your account to go in the negative and your broker can protect you and keep that from happening. If you don't go through a broker, then you need to watch your account yourself. If you suspect it may go into the negative, you may want to close any open positions that you still have.
Now that you know what the margin is and how to calculate, you can keep track of your open positions and your account. Knowing about margins in currency trading can only make you a more successful trader. Do your research. Some brokers? margin requirements could be more or less than 2%.
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