(1) The general rule is that a person's available qualifying expenditure in a pool for a chargeable period consists of—

(a) any qualifying expenditure allocated to the pool for that period in accordance with section 58, and

(b) any unrelieved qualifying expenditure carried forward in the pool from the previous chargeable period under section 59.

(2) A person's available qualifying expenditure in a pool for a chargeable period also includes any amount allocated to the pool for that period under—

section 26(3) (net costs of demolition);

section 86(2) or 87(2) (allocation of expenditure in short-life asset pool);

section 111(3) (overseas leasing: standard recovery mechanism);

section 129(1), 132(2), 133(3) or 137 (provisions relating to operation of single ship pool and deferment of balancing charges in respect of ships);

[section 161C(2) (decommissioning expenditure incurred by person carrying on trade of oil extraction);]¹

section 165(3) ([general decommissioning expenditure]² incurred after cessation of ring fence trade);

section 206(3) (plant or machinery used partly for purposes other than those of the qualifying activity);

section 211(4) (partial depreciation subsidy paid).

(3) A person's available qualifying expenditure does not include any expenditure excluded by—

section 8(4) or 9(1) (rules against double relief);

[section 70DA (transfer and long funding leaseback);]¹

section 166(2) (transfers of interests in oil fields: anti-avoidance);

section 185(2), 186(2) or 187(2) (restrictions where other claims made in respect of fixture);

section 218(1) ...², 228(2)[, 229A]³, 242(2), or 243(2) (general anti-avoidance provisions).

(4) Subsection (1) is also subject to section 220 (allocation to chargeable periods of expenditure incurred on plant or machinery for leasing under finance lease).