The calculator now allows calculations for the years 2008-09 to 2013-14, by including the forthcoming 2013/14 changes that were announced in the 2011 Budget. 

These changes see an increase of 1% for bands covering cars with emissions between 95g/km and 219g/km, up to the maximum rate of 35%.

The tax calculator is available at: http://cccfcalculator.hmrc.gov.uk/