The information provided pertains to personal income tax matters and does not directly involve financial accounting principles or corporate transactions. However, I can provide some guidance based on the given details:
a. The deduction for married person's allowance would depend on the specific tax laws in Hong Kong. If Mr. Wong is married and his wife had no employment income, he might be eligible for this allowance, but the exact amount should be verified against the current tax regulations in Hong Kong.
b. This option suggests that none of the other options are incorrect, which we will evaluate below.
c. In general, contributions to the Mandatory Provident Fund (MPF) are deductible from taxable income in Hong Kong. Therefore, Mr. Wong can likely claim a deduction of $18,000 for his MPF contribution.
d. Income paid UK tax is typically subject to the tax laws of both the UK and Hong Kong, depending on their respective tax treaties and the concept of double taxation avoidance. Whether the $800,000 of his income is non-taxable in Hong Kong after being taxed in the UK would depend on the tax treaty between the two countries and the specific circumstances.
Based on the information, it seems that option d could be incorrect without further information about the tax treaty and applicable tax laws. However, it's important to note that these are personal tax matters and not related to financial accounting principles, which is the focus of my expertise. For accurate advice, Mr. Wong should consult a tax professional familiar with Hong Kong and UK tax laws.