Macau’s currency is the pataca (MOP$), which is divided up into 100 avos. Bills are issued in denominations of MOP$10, MOP$20, MOP$50, MOP$100, MOP$500 and MOP$1000. There are little copper coins worth 10, 20 and 50 avos, and silver-coloured MOP$1, MOP$2, MOP$5 and MOP$10 coins.
The pataca is pegged to the Hong Kong dollar at the rate of MOP$103.20 to HK$100. As a result, exchange rates for the pataca are virtually the same as for the Hong Kong dollar. Hong Kong bills and coins (except the HK$10 coins) are accepted everywhere in Macau. When you spend Hong Kong dollars in big hotels, restaurants and department stores, usually your change will be returned in that currency, but this may not apply at smaller establishments and when you're in a taxi. Try to use up all your patacas before leaving Macau.
Most ATMs allow you to choose between patacas and Hong Kong dollars, and credit cards are readily accepted at Macau’s hotels, larger restaurants and casinos. You can also change cash and travellers cheques at the banks lining Avenida da Praia Grande and Avenida de Almeida Ribeiro, as well as at major hotels.
Tipping is not a must, but is expected. MOP$10 or MOP$20 will do for hotel porters, and tip around 10% of restaurant bills.