SVM24069 - Share Valuation Manual: Self Assessment

Corporation Tax Self Assessment (CTSA)

Accounting periods

Tax under CTSA continues to be charged for accounting periods. No accounting period can exceed 12 months. By contrast income tax is always charged for the tax year to 5 April. The normal due date for payment of Corporation Tax remains nine months and one day after the end of the accounting period (subject to the quarterly payment regime for large companies). Unlike ITSA, there are no surcharges for tax paid late.

Companies do not have the option of getting the Revenue to compute their liability.