28. Recovery of underpayments

(1) If USC payable under an assessment to USC exceeds the total USC deducted from an employee's relevant emoluments during a USC year, the Revenue Commissioners, instead of taking the excess into account in determining—

(a) the appropriate rate cut-off points for a subsequent USC year,

(b) the amount of tax credits (within the meaning of the Income Tax Regulations) for a subsequent USC year in accordance with section 531AY(4) of the Act, or

(c) the standard rate cut-off point (within the meaning of the Income Tax Regulations) for a subsequent USC year in accordance with section 531AY(4) of the Act,

may require the employee to remit the excess to the Collector-General, and, where the Revenue officer so requires, the employee shall remit the excess accordingly on demand made by the Collector-General.

(2) For the purposes of determining the amount of any such excess, any necessary adjustment shall be made to the total USC in respect of any USC overpaid or remaining unpaid for any USC year.