If the Deceased died on or after 9th October 2007 and their spouse / civil partner predeceased without using all of the nil rate band available to them at the time, the Deceased’s Personal Representatives may transfer any unused percentage of the predeceasing spouse’s nil rate band and add it to the Deceased’s nil rate band.
To see some useful example scenarios see:
http://www.hmrc.gov.uk/inheritancetax/intro/transfer-threshold-examples.htm






