This decree provides regulations for implementing Vietnam's Law on Personal Income Tax. It defines key terms like resident and non-resident individuals, and outlines different types of taxable income such as income from business activities, employment, capital investments, transfers, winnings, royalties, franchises, inheritances and gifts. It also specifies types of income that are exempt from tax, such as income from agricultural production, scholarships, pensions, and some property transfers between relatives. The decree provides guidance on calculating taxable business income and salaries, allowable deductions, and procedures for tax reductions.