s 47 Election by individual to transfer relief under section 45 or 46
(1) If— (a) an individual's spouse or civil partner is entitled to a tax reduction under section 45 or 46 for a tax year, and (b) the individual meets the conditions set out in subsection (2), the individual is entitled to a tax reduction for that tax year of 10% of half the minimum amount. (2) The conditions are that the individual— (a) has made an election which is in force for the tax year, (b) makes a claim, and (c) meets the requirements of section 56 (residence etc). (3) If an individual is entitled to a tax reduction under subsection (1), the tax reduction to which the individual's spouse or civil partner is entitled under section 45 or 46 is calculated for the tax year as if the appropriate amount were reduced by half the minimum amount. (4) In subsection (3) “ the appropriate amount ” means— (a) if the individual's spouse or civil partner is entitled to a tax reduction under section 45, the amount specified in section 45(3)(a) ... , after any reductions under section 45(4) and 54(2), or (b) if the individual's spouse or civil partner is entitled to a tax reduction under section 46, the amount specified in section 46(3)(a) ... , after any reductions under sections 46(4) and 54(2).