IPT rate:
October 1994: 2.5%
April 1997: 4.0% (standard rate); 17.5% (higher rate)
July 1999: 5.0% (standard rate); 17.5% (higher rate)
January 2011: 6.0% (standard rate); 20.0% (higher rate)
November 2015: 9.5% (standard rate); 20.0% (higher rate)
October 2016: 10% (standard rate); 20.0% (higher rate)
June 2017 (to present): 12% (standard rate); 20.0% (higher rate)