Tax compliance

Ireland
Corporate tax returns are generally due by the 21st day of the 9th month following the end of the relevant company's accounting period. This may be extended to the 23rd day of such month for companies that file their corporate tax returns online, which most companies are now obliged to do. At this time, companies must pay the balance of any associated tax due via Revenue's Online Service.
Companies are also obliged to pay preliminary tax.
In the case of "large companies" (ie, companies which, in their preceding accounting period, had a tax liability exceeding EUR200,000), there is an obligation to pay preliminary tax in 2 installments. The first installment will be payable by the 21st/23rd day of the 6th month of the accounting period in the amount of 50 percent of the corporate tax liability for the preceding accounting period or 45 percent of the corporate tax liability for the current period. The second installment is payable by the 21st/23rd day of 11th month of the accounting period and the amount payable must bring the total preliminary tax paid to 90 percent of the company's corporate tax liability for the current accounting period. The balance of tax due is payable when the corporate tax return is due to be filed (ie, the 21st/23rd day of the 9th month after the end of the accounting period).
In the case of "small companies" (ie, companies which in their preceding account period had a tax liability of less than EUR200,000), there is an obligation to pay preliminary tax in 1 installment only. This installment is payable by the 21st/23rd day of the 11th month of the accounting period in the amount of 100 percent of the corporate tax liability for the preceding accounting period or 90 percent of the corporate tax liability for the current period.
New or startup companies with a corporation tax liability of EUR200,000 or less in their first accounting period are not required to pay preliminary tax for that period. Rather, the final tax liability for that period for such companies is due and payable when the corporation tax return is filed.