Singapore uses the Singapore dollar, meaning that, except in tourist establishments, airports, or hotels, you normally won't be able to use major currencies like the US dollar or British pound to pay your way.

Generally, you cannot use US dollars (USD) for everyday transactions in Singapore. The official currency is the Singapore Dollar (SGD), and almost all shops, restaurants, and public transport systems require payment in the local currency or via major credit cards. While some high-end luxury boutiques or souvenir shops in major tourist areas like Orchard Road or Marina Bay Sands might technically accept USD, they will do so at an extremely poor exchange rate and will almost always give you change in Singapore Dollars. Furthermore, Singapore’s public transit (MRT and buses) is entirely "contactless," meaning you need a local "EZ-Link" card or a foreign credit card with NFC—physical USD cash is completely useless for getting around. If you arrive with US cash, the best practice is to use one of the many competitive currency exchange booths found in shopping malls or at Changi Airport, or simply use an ATM to withdraw local currency. In 2026, Singapore is nearly a cashless society, so having a card with "no foreign transaction fees" is far more useful than carrying any form of US paper money.