With CFDs, rollovers are determined by the difference between the asset interest rates. If you buy a currency pair such as the USD/ZAR, and the rate is greater than the interest rate on the sold currency, the rollover will be accrued on your trading position. If you're buying a currency and the rate of the currency is less than the interest rate on the currency sold, the rollover will be subtracted from your trading position. Therefore, CFD rollovers can generate extra income, or result in losses. If you're holding a forex CFD position overnight, check the roll rates.