1968 to 2009 the date has never left the 21-day range of April 13 to May 3. See also List of countries by tax rates List of countries by tax revenue as percentage of GDP Rahn curve Government spending Laffer curve Notes External links Tax Foundation's Tax Freedom Day (US only) Tax Freedom Day Clock A live clock that counts the days till/since Tax Freedom Day for USA only. Tax Freedom Day Clock (UK) A live clock that counts the days till/since UK Tax Freedom Day Criticism: Tax Foundation Figures Do Not Represent Typical Households’ Tax Burdens Response to Criticism: Tax Freedom Day: A Description of Its Calculation and Answers to Some Methodological Questions Tax Unofficial observances Libertarian terms