Version 2.3 , 21 April 2022. The CVIC tool supports credible COVID-19 vaccination costing to facilitate a dialogue with stakeholders, while maintaining sensitivity to protect essential health services. The CVIC tool provides a structured and comprehensive estimation of incremental operational and selected capital costs of introducing and deploying COVID-19 vaccines, in alignment with the National Deployment and Vaccination Plan (NDVP). This is essential for resource mobilization, budgeting, and delivery strategy refinement and optimization. The tool has been pre-populated with data from global databases and provides a total cost estimate over an immunization programme over the period of 2021-2023, after which COVID-19 vaccination is expected to be integrated into national immunization plans. Countries can customize the priority target populations based on WHO SAGE guidance and select multiple delivery strategies and vaccine products. The tool is available in all six UN working languages (Arabic, Chinese, English, French, Russian and Spanish) and Portuguese. An e-learning course on CVIC is available at OpenWHO. In this updated version 2.3 of the tool, some minor bugs have been fixed and new features have been added