In the chain of cross-border tax compliance, there is one document that is severely underestimated—the CoR (Certificate of Residence), or proof of Hong Kong tax residency. Many people don’t know what it is, and even more don’t realize how important it is. But in the era of the CRS (Common Reporting Standard) and the automatic exchange of information, the CoR may be your most effective legal tool for mitigating “double taxation risks.”

This is the one thing people are most likely to “put off.” The account is set up, trading is proceeding normally, and everything seems to be going smoothly—and before you know it, a year has gone by without an audit, then two, and then three years have passed.

Then, you’ll receive a letter from the Hong Kong Inland Revenue Department or a notice from your bank regarding an account review. By that point, it will already be too late.

When it comes to corporate taxes in Hong Kong, many people’s first thought is “16.5% profits tax.” But if you think that’s the actual amount of tax you’ll have to pay—you might be overpaying the Hong Kong Inland Revenue Department.

Hong Kong’s profits tax system is actually more sophisticated and flexible than many people realize—it features both “two-tier tax rates” and a wide range of “deductible expenses.” If you don’t understand these rules, you may end up paying far more in taxes than you actually owe.

For many people with Hong Kong bank accounts, the term “CRS” (Common Reporting Standard) has become a source of great fear. CRS 2.0—the latest framework for the automatic exchange of information—has indeed led to a more extensive global sharing of tax information, but you may be mistaken about where the real risks lie.

Many cross-border sellers just starting out ask this question: Do I absolutely have to open a corporate bank account in Hong Kong? Is an online bank account sufficient?

This isn't an either-or situation—more often than not, they are complementary tools for different stages.