End year balance figures are published in the national insurance fund annual accounts.
The monthly balance on the GB National Insurance Fund from September 1996 to March 2006 is shown in the following table. 2005-06 is the last year for which audited accounts of the NI Fund are available.
Month 1996-97 1997-98 1998-99 1999-2000 2000-01 2001-02 2002-3 2003-04 2004-5 2005-06 April — 7.9 9.4 12.4 13.5 19.3 22.4 24.4 26.5 28.8 May — 7.7 9.5 11.0 14.7 19.9 22.6 24.9 25.8 29.8 June — 7.5 9.5 12.7 14.6 20.0 22.9 24.5 25.4 29.5 July — 7.6 10.4 12.6 15.2 20.1 23.8 26.1 27.2 30.7 August — 7.2 10.9 13.1 15.2 19.8 23.6 24.7 28.0 30.9 September 6.4 7.2 11.2 13.0 15.2 20.7 23.3 23.1 27.9 30.1 October 6.8 7.3 11.2 12.3 15.1 20.6 23.1 22.9 27.1 30.3 November 6.2 6.7 11.2 12.5 16.0 20.9 23.2 23.0 26.7 30.4 December 5.5 6.2 10.4 11.8 16.0 21.1 22.4 22.2 25.2 29.4 January 6.7 7.1 11.3 12.8 17.1 21.3 22.6 24.2 25.3 31.8 February 6.6 7.8 11.5 13.4 18.1 22.6 23.8 25.5 25.6 33.3 March 6.7 8.5 11.6 13.4 18.1 21.5 24.4 26.6 27.8 34.8
The balances for 2006-07 are not provided as the accounts for that year have not been finalised and are subject to audit by the NAO at this time.
The NI fund operates within the Government's fiscal rules and any surplus is invested to help fund public services.