Future tax changes are generally taken in the context of the Budget. Deputies will be aware that my officials prepare a series of papers containing tax options for the Tax Strategy Group to be considered in the context of the budgetary process, alongside a wide range of submissions from various stakeholders and lobby groups.
Revenue provides a “Ready Reckoner” to facilitate the estimation of the yield or cost of potential changes to the tax code. This information is available at link: https://www.revenue.ie/en/corporate/documents/statistics/ready-reckoner.pdf and includes (on page 28) the estimated cost of changes or extensions to the 9% rate of VAT for a full year. These estimates are liable to change due to ongoing impacts of the COVID-19 pandemic.