The Singaporean currency is the Singapore dollar, abbreviated SGD, S$ or just $ as used throughout this guide, divided into 100 cents. There are coins of $0.01 bronze, $0.05 gold, $0.10 silver, $0.20 silver, $0.50 silver and $1 gold, plus notes of $2 purple, $5 green, $10 red, $50 blue, $100 orange, $1000 purple and $10000 gold. The Brunei dollar is pegged at par with the Singapore dollar and the two currencies can be used interchangeably in both countries, so don't be too surprised if you get a Brunei note as change. You can safely assume that the '$' sign used in the island-nation refers to SGD unless it includes other initials e.g. US$ to stand for US Dollar.
Restaurants often display prices like $19.99++, which means that service charge 10% and sales tax 7% are not included and will be added to your bill. When you see NETT, it means it includes all taxes and service charges. Tipping is generally not practised in Singapore, and is officially frowned upon by the government, although bellhops still expect $2 or so per bag. Taxis will usually return your change to the last cent, or round in your favor if they can't be bothered to dig for change.
ATMs are ubiquitous in Singapore and credit cards are widely accepted although some shops may levy a 3% surcharge, and taxis a whopping 15%. Travellers cheques are generally not accepted by retailers, but can be cashed at most exchange booths. eZ-Link and Nets Flash Pay cards are accepted in some convenience stores and fast food chains.
Currency exchange booths can be found in every shopping mall and usually offer better rates, better opening hours and much faster service than banks. The huge 24 hr operation at Mustafa in Little India accepts almost any currency at very good rates, as do the fiercely competitive small shops at the aptly named Change Alley next to Raffles Place MRT. For large amounts, ask for a quote, as it will often get you a better rate than displayed on the board. Rates at the airport are not as good as in the city, and while many department stores accept major foreign currencies, their rates are often terrible.
Singapore is expensive by Asian standards but affordable compared with some industrialised countries: $50 is a perfectly serviceable daily backpacker budget if you are willing to cut some corners, though you would probably wish to double that for comfort. Food in particular is a steal, with excellent hawker food available for under $5 for a generous serving. Accommodation is a little pricier, but a bed in a hostel can cost less than $20, an average 3-4 star hotel in the city centre would typically cost anywhere from $100-$300 per night for a basic room, and the most luxurious hotels on the island except maybe the Raffles can be yours for $300 with the right discounts during the off-peak season.
Budget travellers should note that Singapore is much more expensive than the rest of Southeast Asia and should budget accordingly if planning to spend time in Singapore. In general, prices in Singapore are about twice as high as in Malaysia and Thailand and 3-5 times as high as in Indonesia and the Philippines.