ZATCA`s E-Invoicing Phase 2 introduces mandatory e-invoice integration in waves, determined by taxable revenue thresholds. This phased approach allows businesses in Saudi Arabia to adapt gradually, starting with higher-revenue companies. ZATCA issues email notifications to affected businesses, specifying start dates and grace periods for testing systems. Leniency was shown in earlier waves, but recent press releases stress stricter penalties for missed deadlines. Once Phase 2 is active, all invoices must be electronically filed via approved solutions. Businesses should confirm which wave they fall into, plan early to utilize the grace period, and stay updated on changing regulations. Accqrate offers a proven e-invoicing API that seamlessly connects to the ZATCA Fatoora portal, ensuring stress-free compliance for thousands of Saudi businesses each month.