Estimates for Income Tax and Corporation Tax

If you receive an estimate for Income Tax or Corporation Tax

You may receive an estimate for Income Tax or Corporation Tax (CT) if you registered for Income Tax or CT and failed to file your return for one, or more, chargeable periods.

If you should not be registered for Income Tax or CT, you can de-register on the Revenue Online Service (ROS). There is a 'Manage Tax Registrations' option on ROS where you can cancel your tax registrations in a quick and secure manner.

To de-register online

  1. Log into your ROS account.
  2. Go to 'Other Services' and select 'Manage Tax Registrations'.
  3. Click 'Cease Registration' for the specific tax type.
  4. Complete the form to notify Revenue you are no longer a chargeable person. 

To de-register by post

  1. Download and fill out Form TRCN1.
  2. Submit the completed form to your Revenue office.

Next: Calculating the estimate figure

Published: 24 March 2026 Print this page

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