CRS and Tax Residence Self-Certification: Hong Kong, Singapore and Mainland Rules, and Common Mistakes

The Common Reporting Standard (CRS) is the OECD's standard for the automatic exchange of financial account information for tax purposes. Reporting financial institutions such as banks identify each account holder's jurisdiction of tax residence, report each year the accounts of tax residents of reportable jurisdictions to the local tax authority, and the tax authority then exchanges that information with its counterpart. In Hong Kong the mechanism is called the "Automatic Exchange of Financial Account Information" (AEOI), and the tax residence self-certification you sign at account opening is where it begins. CRS exchanges information; it does not by itself determine how much tax you pay, which is a matter for the tax law of each jurisdiction where you are resident.

This page applies to Hong Kong, Singapore and the Chinese Mainland. For your own tax position, seek professional tax advice in your own jurisdiction.

Where CRS fits into account opening: what the self-certification asks for

The FAQ of Hong Kong's Inland Revenue Department (IRD) explains that for all new accounts opened on or after 1 Jan 2017, account holders and controlling persons must provide a self-certification. A self-certification is the account holder's formal declaration of their tax residence, and the IRD may verify its contents where necessary. The information exchanged includes name, address, jurisdiction of tax residence and tax identification number (TIN), among other items.

When circumstances change (for example, moving abroad, or gaining or losing tax residence somewhere), the account holder should notify the bank. The IRD's AEOI FAQ states that a suitably updated self-certification form should be provided to the financial institution within 30 days of the change (the 2016 AEOI question-and-answer pamphlet says the same). Corporate accounts also require an entity self-certification, and passive non-financial entities must report the tax residence of their controlling persons (see Corporate accounts).

Hong Kong's legal framework, reportable jurisdictions and penalties

The definition of an individual tax resident under Hong Kong's AEOI regime (IRD FAQ): an individual who ordinarily resides in Hong Kong; or who stays in Hong Kong for more than 180 days in a year of assessment, or for more than 300 days in two consecutive years of assessment (one of which is the relevant year). This definition exists for AEOI purposes; for other taxes, the IRD's current guidance applies. The Chinese Mainland is a reportable jurisdiction for Hong Kong.

Penalties: the IRD Penalty Policy states that under section 80(2E) of the Inland Revenue Ordinance, any person who knowingly or recklessly makes a statement that is misleading, false or incorrect in a material particular in a self-certification that a reporting financial institution is required to collect commits an offence liable to a fine of HK$10,000. The penalty targets false statements made knowingly or recklessly; it should not be exaggerated into "a mistake means prison", but nor should anyone deliberately conceal a jurisdiction of tax residence.

Amended CRS and CARF: timetable and status

Hong Kong's Inland Revenue (Amendment) (Crypto-Asset Reporting Framework and Amended Common Reporting Standard) Bill 2026 was gazetted on 22 May 2026. The IRD page states that the bill is subject to scrutiny by the Legislative Council; if passed, the CARF amendments are proposed to take effect from 1 Jan 2027 and the amended CRS from 1 Jan 2028. As at 24 Oct 2026 the IRD page still described the bill as subject to LegCo scrutiny, and this site had seen no announcement of its third reading. Readers should follow the IRD's latest announcements.

One direction of the amended CRS is to require account holders to self-certify all their jurisdictions of tax residence (the IRD's wording). For readers, the practical effect is mainly that banks may ask for additional or updated self-certifications and that more financial products come within reporting; the details depend on the final text of the legislation and on bank notices.

The corresponding rules in Singapore and the Mainland

Singapore: the Inland Revenue Authority of Singapore (IRAS) administers CRS and has exchanged information with partner jurisdictions since Sep 2018. For foreigners, individual tax residence (IRAS, updated 27 Apr 2026) includes: staying or working in Singapore for at least 183 days in the previous calendar year; staying or working in Singapore for three consecutive calendar years; or continuous employment spanning two calendar years totalling at least 183 days. The IRAS page for account holders (updated 19 Oct 2021) explains that deliberately giving false information about tax residence can lead to a fine of up to S$10,000, imprisonment of up to 2 years, or both; if a self-certification is not provided, the financial institution may report the account to IRAS, refuse to open a new account or, in some cases, close an existing account. For Singapore TIN details see the CRS and TIN page of the sister site bankaccount.sg.

Chinese Mainland: the Administrative Measures on Due Diligence of Non-resident Financial Account Information, issued by the State Taxation Administration and five other departments, took effect on 1 Jul 2017, with the first outbound exchange in Sep 2018. For Mainland individuals who use a Resident Identity Card as proof of identity, the TIN is the ID card number; for those using a passport, it is issued by the local tax authority (OECD's information on Chinese TINs). Article 1 of the Individual Income Tax Law provides that an individual who is domiciled in China, or who is not domiciled but resides in China for a total of 183 days or more in a tax year, is a resident individual.

Deposit interest: how the three jurisdictions treat it

The point in this table most often misread is this: when Hong Kong and Singapore "do not tax deposit interest", that describes only the tax treatment where the interest arises and does not change a Mainland tax resident's obligation to declare it on the Mainland. Interest a Mainland tax resident earns in a Hong Kong account is generally not taxed in Hong Kong, but the account information is exchanged back to the Mainland under CRS, and whether and how it must be declared there is governed by Mainland rules.

Common mistakes and what not to do

1. Entering only your nationality: tax residence is determined by each jurisdiction's tax law and is not the same as nationality, visa or household registration; someone who holds an HKID card but lives and works mainly on the Mainland may be tax resident in both places and should list both;
2. Filling in forms differently at banks in each place: if you open accounts in both Hong Kong and Singapore, the self-certifications in both places should be truthful and consistent;
3. Using a Hong Kong address as a "substitute" for tax residence: neither a Hong Kong account nor a Hong Kong correspondence address changes your tax residence;
4. Not updating after a change: after moving or acquiring a new status, update your self-certification with the bank within 30 days;
5. Giving the bank contradictory declarations: inconsistent declarations without a reasonable explanation will prompt enquiries and may even affect the banking relationship (see Rejections and document requests).

Opening an account in Hong Kong or Singapore does not change your tax residence and does not avoid CRS exchange. This page explains published rules and mechanisms only and is not tax advice; for questions about your own tax residence and filing, seek professional advice in your own jurisdiction. If you would like this interpreted for your own circumstances, you can register your needs through the contact details on this site.