Detailed statutory analysis & overview
Switching from employment to a Hong Kong sole proprietorship moves you out of salaries tax and into profits tax, which is the single biggest reason contracting can be attractive here. Salaries tax allows almost no expense deductions, because the statutory test is that an expense be wholly, exclusively, and necessarily incurred in producing the income, whereas profits tax lets an unincorporated business deduct ordinary operating costs and claim depreciation allowances on equipment. Setting up is administratively light: you obtain a Business Registration certificate from the Inland Revenue Department within one month of starting to carry on business, and file a profits tax return with accounts rather than a BIR60 employee return. The trade-offs are that you fund your own MPF as a self-employed person, you lose Employment Ordinance protections such as statutory holidays, sickness allowance, and long service payment, and the IRD can recharacterise a disguised employment back into salaries tax. Hong Kong's territorial source principle adds a further planning dimension that simply does not exist for employees.