inheritance tax vs wealth tax

inheritance tax

noun
  • A tax based on the value of the property of a deceased person, and charged on the beneficiaries of the estate. 

wealth tax

noun
  • Any tax which depends on the taxpayer's total assets, including cash, financial assets, and personal possessions. 

How often have the words inheritance tax and wealth tax occurred in a corpus of books? (source: Google Ngram Viewer )