Hong Kong Passes Its Crypto Tax Reporting Law: Exchanges Must Collect User Data From 2027 and Share It Abroad From 2028

Hong Kong lawmakers passed a crypto tax reporting law on Wednesday, November 4, requiring crypto platforms tied to the city to collect their users’ tax details from 2027, so tax officials can share them with other countries from 2028.

The law brings in the OECD’s Crypto-Asset Reporting Framework, or CARF, the global standard for tracing crypto gains across borders. The government said Hong Kong’s Inland Revenue Department will start exchanging the data with partner jurisdictions in 2028.

The same bill updates the Common Reporting Standard, the system banks already use to report foreign accounts. Its new version, which also covers digital financial products, takes effect in 2028.

Hong Kong isn’t moving alone. It is one of 27 jurisdictions, including Singapore, the UAE and Switzerland, that have committed to first exchanges by 2028, the OECD’s latest list shows. Another 46, including the UK, the EU and Japan, start a year earlier.

So what does the new law ask of crypto platforms, and what changes for traders who use them?

What Does Hong Kong’s Crypto Tax Law Require?

It turns crypto platforms into tax reporters. The Inland Revenue Department’s CARF guide calls them reporting crypto-asset service providers: any business that carries out crypto trades for customers, whether as an exchange, a broker, a dealer or a crypto ATM operator.

A platform falls under Hong Kong’s rules if it is tax resident in the city, incorporated there, managed from there, or runs a branch or regular place of business there. Every platform that meets one of those tests has to register with the department, even if it has nothing to report.

For each user, platforms will collect:

• Identity: name, address, date and place of birth
• Tax details: every country of tax residence and the matching taxpayer number, confirmed through a self-certification
• Activity: crypto-to-fiat trades, crypto-to-crypto trades and transfers, including payments and withdrawals to outside wallets, totalled for each coin by value, units and number of transactions

Existing customers aren’t exempt. Platforms get 12 months after the rules take effect to collect self-certifications from users who already have accounts.

The law also sets offences for failing to register, skipping due diligence or filing wrong returns. Users can be prosecuted too, for knowingly or recklessly giving false information in a self-certification.

“Hong Kong has been supporting international efforts in enhancing tax transparency and combatting cross-border tax evasion,” said Christopher Hui, Hong Kong’s Secretary for Financial Services and the Treasury.

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When Do the New Tax Rules Start?

On January 1, 2027, less than two months away. The bill moved quickly: a public consultation ran from December 2025 to February 2026, and the government published the bill on May 22.

Platforms that first fall under the rules in 2027 have until January 31, 2028, to register. The department hasn’t yet published the details of its online portal or the data format it wants.

Hong Kong is in the second wave. The OECD’s commitments list, last updated on September 14, splits the world like this:

• First exchanges by 2027 (46): the UK, most EU states, Japan, Korea, Brazil, the Cayman Islands and others
• By 2028 (27): Hong Kong, Singapore, the UAE, Switzerland, Australia, Canada, Thailand and others
• By 2029 (4): the United States, Mexico, Argentina and Azerbaijan
• Not yet committed (4): India, Viet Nam, El Salvador and Georgia

Hong Kong’s rivals for crypto business are on the same schedule. Singapore and the UAE have also committed to their first exchanges by 2028.

What Does the Crypto Tax Law Mean for Traders?

More paperwork first, then less privacy. From January, anyone opening an account on a Hong Kong platform should expect a self-certification form asking where they pay tax and for their taxpayer number in each place.

Existing users will get the same request within a year. Lying on it is an offence under the new law, so ticking the wrong country isn’t a way around it.

What gets shared:

• Who receives it: the tax offices of the partner jurisdictions where a user is resident, through Hong Kong’s Inland Revenue Department
• What they see: yearly totals for each coin, covering buys and sells for cash, swaps between coins, and transfers out to private wallets
• What they don’t see: single trades, since the data is grouped by coin

That is usually enough for a tax office to spot crypto gains that never showed up on a return. Transfers to outside wallets are covered too, so moving coins off the exchange still leaves a record.

Platforms carry the heavier load. They have under two months to build the forms, the checks and the records, and the department has yet to publish its portal details.

For traders, Hong Kong’s crypto tax law closes one of the last big Asian gaps in the OECD’s reporting net. By 2028, a crypto account in Hong Kong, Singapore or Dubai will be about as visible to a home tax office as a bank account.

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