Crypto investors across 48 countries will have wallet transaction data recorded for tax purposes as the Crypto-Asset Reporting Framework begins implementation.
The framework, developed by the Organisation for Economic Co-operation and Development, will formally take effect in 2027.
From Jan. 1, crypto service providers are required to start collecting transaction data needed for future reporting.
The rules apply to centralised exchanges, certain decentralised platforms, crypto ATMs and brokers.
Authorities said the move is aimed at increasing transparency and reducing tax evasion and money laundering.
The OECD said many participating jurisdictions already have legislation in place or are finalising enforcement.
G20 finance ministers have pushed for stronger crypto tax reporting measures since 2021.
Core rules for the reporting framework were finalised by the OECD in 2022.
The first group of 48 countries will begin recording transactions in 2026 for data sharing in 2027.
A second group of 27 jurisdictions will delay information exchanges until 2028.
Australia, Canada, Mexico and Switzerland are among those given until January 2027 to start data collection.
Hong Kong has launched consultations on implementing the framework and updating tax reporting standards.
Officials linked the move to efforts to combat cross-border tax evasion.
Tax software firm TaxBit warned the data could eventually be used beyond taxation.