Shares of British banks and financial firms with significant exposure to China declined sharply following Beijing’s intensified crackdown on unpaid taxes connected to overseas investments. The move comes as Chinese authorities launched a global search targeting billions of pounds in unpaid taxes dating back to as early as 2000.

HSBC, which operates extensively in Hong Kong and mainland China, saw its shares fall by more than 5 percent. Standard Chartered, another major British bank with substantial business ties to China, dropped more than 2 percent. Prudential, the insurance group that has shifted much of its operations to the Far East in recent years, experienced a decline of up to 8 percent during trading.

The Chinese tax authorities have increased scrutiny of overseas capital gains and investment income. Financial institutions have been instructed to review investments made abroad by wealthy Chinese nationals to ensure all income has been properly declared to tax officials. This crackdown is part of broader tax reforms aimed at capturing revenue from gains on real estate, equities, cryptocurrencies, and other asset classes.

Reports indicate that some regional tax bureaus have imposed personal income tax rates of up to 20 percent on returns from offshore insurance policies. Authorities appear to be focusing particularly on dividend payments and interest earned on premium investments. While this could affect finance providers dealing with offshore wealth management, analysts at Citigroup suggest the overall impact on earnings may be limited, as offshore vehicles tend to be held predominantly by ultra-high-net-worth individuals.

The current measures follow earlier steps taken by Chinese authorities to stem capital flight. In June, it was reported that banks in Hong Kong had suspended the opening of accounts for mainland clients due to increased regulatory pressure. This year, stricter requirements were applied to individual investment accounts to curb unauthorized cross-border securities, futures, and fund activities.

Accounts flagged as suspicious by regulators are often frozen pending full payment of any outstanding taxes. The ongoing crackdown reflects Beijing’s efforts to consolidate fiscal revenues amid economic challenges while tightening control over the global movement of Chinese capital.