Since every currency trade involves borrowing one currency to buy another, interest rollover charges are part of Forex trading. Interest is paid on the currency that is borrowed and earned on the one that is bought. In effect, you earn or pay interest depending on the direction of your position. If you are buying a currency with a higher interest rate than the one you are borrowing, the net differential will be positive (i.e. AUD/USD) – and you will earn funds (be credited) as a result. If you are selling a currency with a higher interest rate than the one you are borrowing, the net differential will be negative, and you will end up paying (be debited) for that rollover. The Rollover costs/credits are based on your position size, with the larger the position, the larger the cost or gain to you.
You can easily view the swaps for a product by right-clicking on the currency pair in the market watch, and then selecting ‘specification’ which will provide you with the trading details of your desired pair.