Business Tax- How Quarterly instalments work in Corporation tax? Box 630/631 – Large and Very Large

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Business Tax- How Quarterly instalments work in Corporation tax? Box 630/631 – Large and Very Large

17th March 2008

The corporation tax payments screen can be used to list clients whose corporation tax instalments are due for a specified date range. For example, instalments due between 1st March 2012 and 31st March 2012. For each client the instalments column shows whether the client pays single or quarterly payments of corporation tax. To access the Corporation Tax Payments screen: 1. Log on to Practice Management. 2. From the Staff Control Panel, click on Launch and select Corporation Tax Payments.

NOTE: In IRIS Version 25.1.0/25.2.0 Business Tax, the Quarterly Instalment payment reminder are due warning should be auto loading in BT. There is a known issue where these will not be showing up and our Development team is planning a fix in version 26.1.0 in the April 2026. In the meantime you will need to manually run the report to ensure you make the quarterly payments.

Data entry/calculator/indicators – Box 630 large or Very Large box 631 options cannot be unticked and are greyed out? This is caused by existing instalments entered into BT. Go to Administration/ Client account/Go to Administration/ Client account/ Delete the Instalments on account within the year.(ALSO Tick the boxes ‘show full accounts?’ and ‘show fully matched’ postings? which will show any hidden rows) Note down what was entered and then Delete the relevant ‘Instalments on account’ within the affected year(these entries are blocking the 630/631 box).
Then go to Data entry/ Calculation/ Indicators/ Corporation tax instalments section now active and you can now select large or very large company.

Most limited companies make their payment of corporation tax to the Revenue once a year, 9 months and 1 day after the end of the CTAP. This is a single payment and displayed in the corporation tax payment screen as ‘single’ in the instalments column. However, large companies whose CTAPs end after 30 June 1999 now have to pay their corporation tax quarterly. These are displayed in the corporation tax payment screen as 1st, 2nd, 3rd and final under the instalments column. When are the quarterly payments made The instalments are due in three-monthly intervals starting 6 months 14 days from the start of the CTAP. The number of instalments cannot exceed 4 but may be less than 4 if the company has a short period. The first payment due date is measured from the start of the period. The interim payments are measured from the date of the first instalment. The final payment is measured from the end of the period.

  The first payment becomes due and payable on the date 6 months and 13 days from the start of the accounting period.

  The final payment shall be treated as becoming due and payable on the date which is 3 months and 14 days from the end of the accounting period.

  Additional payments are treated as becoming due and payable on the date which is 3 months after the date of the immediately preceding instalment payment. Example – Normal Quarterly Payments If a company has a 12 month accounting period ending on 31 December 2011 then the payment dates will be as follows:

  14 July 2011

  14 October 2011

  14 January 2012

  14 April 2012 The company will have to start paying corporation tax instalments before the end of the CTAP so it has to estimate it’s corporation tax liability.

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