The inquiries suggest a potential broadening of the tax authorities' focus beyond high-net-worth individuals and offshore trusts. While the specific reasons for these inquiries are not detailed, they come amid a wider campaign by Chinese tax officials to ensure compliance and potentially increase tax revenue.

The newspaper has been reporting on China's tax clampdown, which has included measures targeting undeclared income and assets held internationally. The recent contacts by tax officials indicate that the scope of this campaign may be expanding to include retirement savings held in Hong Kong by residents of mainland China.

Further details regarding the nature of the inquiries and the specific tax regulations being applied have not been disclosed. The situation is developing as tax authorities continue their efforts to scrutinize financial arrangements across borders.