I've read somewhere that rich people were heavily taxed during World War I and World War II. What was the inheritance tax rate like in the UK at the time?
This graph illustrates the top inheritance tax rates since 1900 for four major Western governments: U.K., U.S., France, and Germany.
For the U.K. in regards the two world wars it shows the top rate changing:
in 1915 from from 15% to 20% and again in 1919 to 40%;
in 1940 from 55% to 65% and again in 1945 to 75%