(1) Subject to subsection (2), every person who makes a payment of tax to the Revenue Commissioners or to the Collector-General shall identify the liability to tax against which he or she wishes the payment to be set.
(2) Where payment of tax is received by the Revenue Commissioners or the Collector-General and the payment is accompanied by a pay slip, a tax return, a tax demand or other document issued by the Revenue Commissioners or the Collector-General, the payment shall, unless the contrary intention is or has been clearly indicated, be treated as relating to the tax referred to in the document concerned.
(3) Where a payment is received by the Revenue Commissioners or the Collector-General from a person and it cannot reasonably be determined by the Revenue Commissioners or the Collector-General from the instructions, if any, which accompanied the payment which liabilities the person wishes the payment to be set against, then the Revenue Commissioners or the Collector-General may s
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