I am advised by Revenue that the available statistical information in respect of tax receipts by companies is included in Revenue’s research paper on Corporation Tax published at link https://www.revenue.ie/en/corporate/documents/research/ct-analysis-2019.pdf. This analysis relates to 2017 which is the most recent year currently available. Similar analysis for 2018 will be published shortly. Section 4 of the paper contains detailed information on Corporation Tax and employment taxes paid by companies (multinational and non-multinational). Figure 8 shows the level of Corporation Tax paid, broken down by the number of employees of the companies.
Revenue has also confirmed to me that it is not possible to separately identify Income Tax receipts arising from Case 1 alone. However, the total Schedule D Income Tax Receipts for 2019 was €1,881m. A breakdown of these receipts based on employee numbers is not available.