4.—(1) In these Regulations “latest available tax year” means the tax year which, on the date on which the Secretary of State requests information from HMRC for the purposes of regulation 35 (historic income) or regulation 69 (non-resident parent with unearned income), is the most recent relevant tax year for which HMRC have received the information required to be provided in relation to the non-resident parent under the PAYE Regulations or in a self-assessment return.
(2) In this regulation a “relevant tax year” is any one of the 6 tax years immediately preceding the date of the request for information referred to in paragraph (1).