
Corporation Tax Returns
A company's Corporation Tax return is due 9 months after the end of the accounting period, but no later than the 21st day of that month. For example, where the company's period end is 31 December 2011 the tax return will be due by 21 September 2012. Where tax returns and payments are made electronically, via the Revenue Commissioners' Online System, the tax return filing and payment deadlines are extended to the 23rd day of the month, therefore for the period ended 31 December 2011 the tax return and payment are due by 23 September 2012.