This ZATCA guideline provides clarification on the rules for deducting Value Added Tax (VAT) on purchases, known as input tax, in the Kingdom of Saudi Arabia. It details the conditions for eligibility, including the requirement for costs to be linked to taxable economic activities. The guide explains the categories of input tax (supplier VAT, reverse charge, imports) and outlines specific restrictions on deduction for items like entertainment and certain motor vehicles. It also covers documentation, timing, and the proportional deduction method for businesses making both taxable and exempt supplies, primarily clarifying Articles 49, 50, and 51 of the VAT Implementing Regulations.