http://www.legislation.gov.uk/nisr/2012/40/contents/made
The Social Security Pensions (Flat Rate Introduction Year) Order (Northern Ireland) 2012
State pensions
en
Government Printer for Northern Ireland
2013-08-07
SOCIAL SECURITY
This Order provides that the flat rate introduction year, which will be used for the purposes of calculating additional State Pension, shall be the tax year beginning 6th April 2012.