(1) Where a Revenue officer has reason to believe that there is an amount of appropriate tax in relation to a relevant payment that ought to have been but has not been included in a return under section 529E(1), or where the Revenue officer is dissatisfied with any such return, the Revenue officer may make an assessment on the qualifying company to the best of the officer's judgement of the amount of the appropriate tax which in the opinion of the officer is due and payable by the qualifying company for the chargeable period or periods.

(2) Without prejudice to section 529E but subject to subsection (4), the amount of tax specified in an assessment under subsection (1) shall be due and payable to the Revenue Commissioners from the qualifying company so assessed.

(3)

(a) A Revenue officer may, where the officer considers this necessary, amend an assessment of tax made under subsection (1), and where, in accordance with this section, the Revenue officer makes or amends an assessment, the officer shall give notice to the qualifying company assessed showing the total amount of tax due and payable in accordance with the assessment.