T. Clark and A. Dilnot, ‘Long-term trends in British taxation and spending’, IFS Briefing Note BN25, 2002, for pre-1948 figures; ONS series YBHA and ANBT thereafter.
Inheritance tax is levied on wealth bequeathed at death, or given away shortly before death, above a threshold. Around 5% of all deaths attracted inheritance tax in 2022–23.