Singapore has finalized regulations implementing the OECD's Crypto-Asset Reporting Framework, or CARF, requiring exchanges, brokers, trading venues and other in-scope crypto service providers with a Singapore nexus to collect and report detailed client transaction data to the Inland Revenue Authority of Singapore (IRAS) from 1 January 2027. New users must provide tax residency, tax identification number and date of birth at onboarding from that date, while existing users have until 31 December 2027 to submit the same self-certification. From 1 January 2028, platforms are legally barred from executing trades for users without valid documentation on file. The reporting covers annual aggregates for each user and each token, including fiat purchases and sales, crypto-to-crypto swaps, and transfers in and out, for automatic exchange with the user's tax authority under existing bilateral tax treaties. The measures do not create a new crypto tax or change Singapore's current treatment of digital assets, but align crypto reporting with the Common Reporting Standard already used for other financial assets.