(1) Where in any tax year section 485E applies to an individual, the excess relief shall be carried forward to the next tax year and, subject to sections 485E and 485G(2)(a)(iii), the individual shall, in computing the amount of his or her taxable income before the application of section 485E in that next tax year, be entitled to a deduction from his or her total income of an amount equal to the amount of the excess relief.

(2) If and so far as an amount equal to the excess relief once carried forward to a tax year under subsection (1) is not deducted or is not fully deducted from the individual's total income for that year, the amount or the balance of the amount not deducted under subsection (1) shall be carried forward again to the next following tax year and, subject to section 485E, the individual shall, in that next following tax year, in computing the amount of his or her taxable income before the application of section 485E in that next following year, be entitled to a deduction from his or her total income of an amount equal to the amount so carried forward and so on for each succeeding tax year until the full amount of the excess relief has been deducted from the individual's total income for the tax years concerned.