Hong Kong vs Mainland China Tax Systems: 8 Things Cross-Border Business Owners Need to Understand First

Trying to claim an “offshore tax exemption”—only to end up paying tax instead?

Introduction

Many business owners engaged in cross-border operations and overseas expansion are still using a playbook from ten years ago: incorporate in BVI or the Cayman Islands, route profits to Hong Kong, keep the people in Mainland China, and assume that “the authorities will never find out.” But what has happened over the past two years? The authorities can find out—and enforcement has intensified.

We recently held an internal seminar comparing the tax systems of Hong Kong and Mainland China, dismantling this outdated way of thinking. The core message from the entire session can be summed up in one sentence: you need to have “people” in Hong Kong.

What matters is not your status but the time you actually spend there; not how many shell entities you have, but whether you have real personnel and genuine business operations.

Below are eight key points I have summarised, each based on real cases.

1. The Fundamental Difference: Hong Kong Taxes on a Territorial Source Basis, While Mainland China Taxes Worldwide Income

The most fundamental difference between the two tax systems is not the tax rate, but the basis of taxation.

Hong Kong applies the territorial source principle. Whether you are a Hong Kong tax resident is generally not decisive; Hong Kong taxes income arising in or derived from Hong Kong. If you live in Hong Kong and trade US stocks, buy overseas property or make foreign investments, income not sourced from Hong Kong is, in principle, not subject to Hong Kong tax.

Mainland China applies worldwide taxation. If you are a Chinese tax resident, your investment income and employment income from anywhere in the world are, in principle, reportable in Mainland China.

Why have CRS and Document No. 837 had such a major impact on high-net-worth individuals in Mainland China? The answer lies in this mismatch: Hong Kong may impose little or no tax, while Mainland China may require an additional 20% tax payment.

The key differences are summarised below:

2. The Most Counterintuitive Point: The More You Pursue an “Offshore Exemption,” the More Likely You Are to Be Taxed

One client used a Hong Kong company to hold a Mainland Chinese company and planned to sell the Mainland company’s shares at a profit. The client asked how to structure an “offshore exemption” so that the capital gain would not be taxed in Hong Kong.

Our advice was the exact opposite: the more you try to make the transaction “offshore,” the more likely it may be taxed; treating it as “onshore” may, in some cases, result in no tax.

There are two reasons. First, offshore capital gains may themselves be taxable. Second, to enjoy an offshore exemption, the FSIE economic substance conditions may need to be satisfied. One practical detail can be crucial: where the sale and purchase agreement is negotiated and signed. Negotiating and signing it in Hong Kong may be more likely to support a non-taxable outcome, while travelling elsewhere to negotiate and sign it may instead trigger tax.

Tax planning today can no longer rely on the reflex that “offshore equals tax-exempt.” You must first determine whether the investment activity should actually be carried out in Hong Kong.

3. The New FSIE Regime: Dividends and Interest Previously Treated as Exempt May Now Be Taxed at 16.5%

Hong Kong introduced its new foreign-sourced income exemption (FSIE) regime in 2023. It affects several categories of income, including interest, dividends, disposal gains and intellectual property income.

In the past, many people assumed that these types of income were automatically exempt in Hong Kong. That is no longer necessarily the case. If the relevant conditions are not met, the income may be taxed at 16.5%. One of the most important conditions is the economic substance requirement: you need to have people in Hong Kong.

A real-life trap: one client used a Hong Kong entity to invest in Korea and received dividends. The client only wanted a Hong Kong Certificate of Resident Status to reduce Korean withholding tax, but overlooked Hong Kong’s economic substance requirement. As a result, the Hong Kong tax rate on the dividend jumped directly from 0% to 16.5%, producing a costly outcome.

A Hong Kong company without economic substance is now little different from a BVI company—and carries similar risks. Many Mainland enterprises, and even quite a few Mainland tax and accounting firms, are still operating under the decade-old assumption that “dividend income is tax-exempt.”

4. Incorporating in BVI, the Cayman Islands or Hong Kong Does Not Prevent Mainland Tax Exposure If the People Are in Mainland China (CFC)

Recently, the Chinese tax authorities have intensified enforcement under the controlled foreign company (CFC) rules.

One shipping client had legitimately enjoyed a 0% tax rate in Hong Kong for years. However, all shareholders, directors and operational staff were based in Mainland China. We repeatedly advised the client to keep as much personnel as possible in Hong Kong, but the advice was ignored. The client is now being pursued for substantial back taxes.

Another client engaged in entrepôt trade and cross-border e-commerce paid 16.5% tax in Hong Kong and obtained no tax saving, yet the employees receiving salaries actually worked in Mainland China. The Chinese tax authorities still sought to impose Mainland China’s 25% corporate income tax.

Setting up a company in Hong Kong, BVI, the Cayman Islands or Seychelles does not mean tax can be avoided in both jurisdictions. If all personnel managing and operating the company are in Mainland China, the company may be exposed to Mainland taxation. Any structure you can think of has likely also occurred to the tax authorities.

5. The Overlooked “Small Tax”: A HK$1 Share Transfer May Still Attract Hong Kong Stamp Duty Based on Market Value

The stamp duty treatment of share transfers differs completely between the two jurisdictions, and many people are caught out.

Mainland China generally charges stamp duty based on the transfer consideration. If the subject matter is worth RMB10 million but is transferred for RMB1, the duty is calculated based on RMB1.

Hong Kong charges stamp duty on the higher of the consideration or market value. If shares in a Hong Kong company worth HK$10 million are transferred for HK$1, Hong Kong calculates stamp duty based on HK$10 million.

The “HK$1 transfer” approach does not work in Hong Kong; market value is what matters. This often requires negotiation with and evidence to the tax authority. In addition, an intragroup share transfer may qualify for relief under section 45, but a specific application must be made.

6. Document No. 837 + 20% Tax on Overseas Income: Individuals Can No Longer Stay Outside the Net

The preceding points concern companies. This one concerns individuals.

Document No. 837 requires many Chinese individuals to proactively disclose overseas assets. Together with CRS information exchange, overseas investment income may be subject to 20% individual income tax, and enforcement has become much more serious since last year.

By contrast, foreign-sourced income is generally not taxed in Hong Kong: if you are employed by a Hong Kong company but work overseas or in Mainland China on a long-term basis, Hong Kong may not tax that income; gains from investing in US stocks are also generally not taxed in Hong Kong. This contrast is precisely why so many individuals and companies have rushed to obtain Hong Kong tax resident status over the past two years.

Holding a Hong Kong identity card does not automatically make you a Hong Kong tax resident; holding a passport from a small country does not automatically mean you are no longer a Chinese tax resident. The determination depends on time spent (183 days in Mainland China / 180 days in Hong Kong or 300 days over two consecutive years), household registration, family ties and the centre of economic interests. If you remain in Mainland China for the long term, accumulating additional identities will not solve the problem.

7. An Undervalued Benefit: Hong Kong’s R&D Tax Deduction Can Be More Attractive Than Mainland China’s

After discussing so many risks, it is also fair to acknowledge that Hong Kong offers some genuinely attractive incentives, such as the enhanced deduction for research and development (R&D) expenditure.

Hong Kong offers a 300% enhanced deduction (with no cap) plus a 200% enhanced deduction, compared with Mainland China’s 100% deduction. Qualifying R&D businesses may also benefit from a corporate tax rate as low as 5%.

But the same condition still applies: the R&D must genuinely be carried out in Hong Kong by people working in Hong Kong.

Hong Kong also offers a wide range of incentives for family offices, finance, shipping, aircraft leasing and other sectors, with some activities potentially enjoying a 0% tax rate. Without exception, however, the business must be managed in Hong Kong and have sufficient employees there.

8. Stop Believing That “Paying No Tax Is Easy”: Hong Kong Is Also Investigating, and Criminal Liability May Apply

A final word of caution: the Hong Kong Inland Revenue Department has also stepped up enforcement, and serious cases may involve criminal liability. Two high-risk practices are particularly common:

First, routing business income into a personal bank account and assuming it will go unnoticed. Second, booking a large consulting or service fee as an expense when the recipient has neither reported the income nor paid tax on it. Hong Kong expects the records to “match”: if Company A pays a fee, Company B should report the corresponding income. Unmatched or fictitious expenses will simply be disallowed.

Including an expense in the audited financial statements does not automatically make it tax-deductible. Hong Kong looks at whether it is reasonable and genuinely incurred; personal expenses and unsupported items may still be disallowed.

One limited reassurance is that Hong Kong generally assesses back taxes for no more than six years, except in highly exceptional circumstances; the period is not unlimited.

Final Thoughts

These eight points all lead to the same conclusion:

The old tax avoidance playbook of “shell entities + profit shifting + people staying in Mainland China” has become obsolete.

CRS, Document No. 837, CFC rules, FSIE, Pillar Two (a 15% global minimum tax with a EUR750 million threshold, already effective in Hong Kong)… information exchange is now too easy for non-compliant tax planning to remain viable. The only sustainable options are compliant planning and genuine substance.

For most Mainland enterprises and individuals, Hong Kong is probably the lowest-cost and most practical overseas location in which to establish real personnel and substantive operations. This is especially true in the Greater Bay Area: daily travel between Shenzhen and Hong Kong is so convenient that employees can work in Hong Kong on a rota. The Cayman Islands, Singapore and Dubai cannot offer the same practical arrangement.

So, if you remember only one sentence from this article:

Stop focusing on which status or identity to hold. First ask whether you actually have people genuinely working in Hong Kong.