Taxes Consolidation Act, 1997 (Number 39 of 1997)
93 Cash basis, etc: relief for certain individuals.
(1) In this section—
“the net amount” with which a person is chargeable to tax under section 91 means the amount with which such person is so chargeable after making any deduction authorised by section 91(4) but before giving any relief under this section;
“relevant date” means—
(a) in relation to tax under section 91, the date of the permanent discontinuance, and
(b) in relation to tax under section 94, the date of the change of basis.
(a) the individual was engaged in carrying on the trade or profession on the 4th day of August, 1970, and
(b) the profits or gains of the trade or profession were not computed by reference to earnings in the period in which the date specified in paragraph (a) fell, or in any subsequent period ending before or on the relevant date,
the net amount with which such individual is so chargeable to tax shall be reduced by multiplying that net amount by the fraction specified in subsection (4).
(3) Where section 94 applies in relation to a change of basis taking place on a date before the 4th day of August, 1970, then, in relation to tax chargeable by reference to that change of basis, subsection (2) shall apply as if—
(a) that earlier date were substituted for the date specified in paragraph (a) of that subsection, and
(b) paragraph (b) of that subsection were deleted.
(4) The fraction referred to in subsection (2) is—
(a) where on the 6th day of April, 1970, the individual had not attained the age of 52 years, nineteen-twentieths,
(b) where on that date the individual had attained the age of 52 years, but had not attained the age of 53 years, eighteen-twentieths, and so on, reducing the fraction by one-twentieth for each year the individual had attained, up to the age of 64 years,
(c) where on that date the individual had attained the age of 65 years or any greater age, five-twentieths.