• Payroll - technical specifications

Payroll - technical specifications

Income Tax

PAYE tax table routine (PDF 333K)
Version 12
Version date July 2009

PAYE nominal taxable pay tables G – Free of tax (PDF 1.5MB)
Version 2.2
Version date September 2008

National Insurance (NI)

NI guidance for software developers - 2012-13 (PDF 2MB)
Version 1.0
Version date December 2011 Includes examples of NI calculations using the 2012-13 earnings rates and limits

NI guidance for software developers - 2011-12 (PDF 1.49MB)
Version 1.0
Version date December 2010 Includes examples of NI calculations using the 2011-2012 earnings rates and limits

NI guidance for software developers - 2010-11 (PDF 2.5MB)
Version 1.0
Version date December 2009 Includes examples of NI calculations using the 2010-2011 earnings rates and limits

NI guidance for software developers- 2009-10 (PDF 864K)
Version 1.0
Version date December 2008 this replaces the supplement to NI guidance for software developers 2003 onwards issued in November 2007 and sets out examples of NI calculations using the 2009-2010 earnings rates and limits

Supplement to NI guidance for software developers for 2003 onwards (PDF 234K) Version 6.1
Version date November 2007 this supplements the NI guidance for software developers for 2003 onwards issued in July 2003 and sets out examples of NI calculations using the 2008-2009 earnings rates and limits

Supplement to NI guidance for software developers for 2003 onwards (PDF 262K) Version 5.1
Version date January 2007 this supplements the NI guidance for software developers for 2003 onwards issued in July 2003 and sets out examples of NI calculations using the 2007-2008 earnings rates and limits

Supplement to NI guidance for software developers for 2003 onwards (PDF 343K) Version 4.1
Version date December 2005 this supplements the NI guidance for software developers for 2003 onwards issued in July 2003 and sets out examples of NI calculations using the 2006-2007 earnings rates and limits

Supplement to NI guidance for software developers for 2003 onwards (PDF 213K) Version 3.1
Version date December 2004 this supplements the NI guidance for software developers for 2003 onwards issued in July 2003 and sets out examples of NI calculations using the 2005-2006 earnings rates and limits

Supplement to NI guidance for software developers for 2003 onwards (PDF 856K) Version 2.1
Version date February 2004 this supplements the NI guidance for software developers for 2003 onwards issued in July 2003 and sets out examples of NI calculations using the 2004-2005 earnings levels and rates

NI guidance for software developers for 2003 onwards (PDF 577K)
Version 1.0
Version date July 2003 this sets out the new calculation formulae for NI Changes for 2003 onwards

NI guidance for software developers for 2002-2003 – supplements (PDF 448K)
Version date December 2001 this supplements the NI guidance for software developers 2002-2003 issued in November 2001 and sets out examples and rates of NI calculations

NI guidance for software developers for 2002-2003 (PDF 304K)
Version date November 2001 this specification sets out a new calculation format for National Insurance contributions and clarifies some points on Statutory Maternity Pay and Statutory Sick Pay


NI guidance for software developers for 2001-2002 (PDF 144K)
Version date February 2001 this specification sets out a new calculation format for National Insurance contributions and clarifies some points on Statutory Maternity Pay and Statutory Sick Pay


NI guidance for software developers - supplement (PDF 133K)
Version date February 1999 this supplements the NI Guidance for Software Developers issued in September 1998 and sets out examples of NI calculations

NI guidance for software developers (PDF 84K)
Version date November 1998 amendments to version dated September 1998

NI guidance for software developers (PDF 334K)
Version date September 1998 this specification sets out a new calculation format for National Insurance contributions

Statutory payments

Statutory payment legislation changes 1 April 2007
Changes to statutory payments legislation which became effective from 1 April 2007

Additional Statutory Paternity Pay (Adoption) 1.3 (PDF 234K)
Version 1.3
Version date January 2011

Additional Statutory Paternity Pay (Birth) (PDF 121K)
Version 3.0
Version date January 2011

Statutory Adoption Pay, Statutory Paternity Pay, Statutory Maternity Pay changes document (PDF 76K)
Version 2.0
Version date December 2002

Statutory Adoption Pay (PDF 152K)
Version 1.2
Version date December 2002

Statutory Adoption Pay (PDF 193K)
Version 2.1
Version date January 2007

Statutory Paternity Pay (Adoption) (PDF 152K)
Version 1.4
Version date September 2003

Statutory Paternity Pay (Adoption) October 2006 (PDF 198K)
Version 2.0
Version date October 2006

Statutory Paternity Pay (Birth) (PDF 164K)
Version 1.4
Version date September 2003

Statutory Paternity Pay (Birth) October 2006 (PDF 204K)
Version 2.1
Version date March 2008

Statutory Sick Pay (SSP) (PDF 48K)
Version 1.3
Version date April 2002

Statutory Sick Pay October 2006 (PDF 166K)
Version 2.0
Version date October 2006

Statutory Sick Pay October 2008 (PDF 158K)
Version 3.0
Version date October 2008

Statutory Sick Pay change document (PDF 6K)
Version 1.0
Version date April 2002

Statutory Maternity Pay (cover note) (PDF 167K)
Version 1.2
Version date December 2002

Statutory Maternity Pay October 2006 (PDF 303K)
Version 2.0
Version date October 2006

Student loans

Collection of student loans (PDF 98K)

Version 1.0
Version date April 2006

Working Tax Credits

Working Tax Credits (PDF 132K)
Version 2.1
Version date May 2003