Countries are planning the introduction of COVID-19 vaccines for 2021 and need an estimate of the incremental costs for resource mobilization purposes, including the World Bank’s COVID-19 Fast-Track Loan Facility. This publication showcases the CVIC tool that countries can use to prepare budgets for vaccination beyond 2021 as COVID-19 vaccine is deployed. The tool is designed to support a rapid, yet comprehensive, estimation of the incremental costs.