Final answer:
According to the Arrangement between the Mainland of China and the Hong Kong SAR for the Avoidance of Double Taxation and Prevention of Fiscal Evasion, the taxing rights on the income from the sale of shares in Company A and Company B will be determined based on the location of the companies' main businesses. In the case of Company A, the income would be subject to taxation in Hong Kong. In the case of Company B, the income would be subject to taxation in China. Mr Wong's income from his employment with SCL would be subject to taxation in Hong Kong.
Step-by-step explanation:
(a) Taxing rights on income from the sale of shares:
According to the Arrangement between the Mainland of China and the Hong Kong SAR for the Avoidance of Double Taxation and Prevention of Fiscal Evasion, the taxing rights on the income from the sale of shares in Company A and Company B will be determined based on the location of the companies' main businesses.
In the case of Company A, which is incorporated in China but has its main business in property investment in Hong Kong, the taxing rights on the income from the sale of shares would belong to Hong Kong. This means that the income would be subject to taxation in Hong Kong.
In the case of Company B, which is incorporated in China and has its main business in exporting goods from China, the taxing rights on the income from the sale of shares would belong to China. This means that the income would be subject to taxation in China.
(b) Mr Wong's income from employment with SCL:
Based on the information provided, Mr Wong's income from his employment with SCL would not be subject to individual income tax in mainland China. Although Mr Wong spends a significant amount of time in China for business purposes, his compensation is paid by SCL, a Hong Kong company. Therefore, his income would be subject to taxation in Hong Kong.