"Keynsianism Again: Interview with Lawrence Klein", Challenge (May-June 2001)
“There's a reason why you only do tax policy in a major way every few years — it's really complicated.”
Source: " Senate Democrats target billionaires https://www.axios.com/senate-democrats-billionares-tax-biden-7078079f-7235-4ae6-ab7d-d3bd0476517e.html" (October 23, 2021)
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Mark Warner 3
United States Senator from Virginia 1954Related quotes
Tram Nguyen, "No Sanctuary: Elvira Arellano Deported Without Son," RaceWire: The Colorlines Blog (2007-08-20) http://www.racewire.org/archives/2007/08/immigrant_mother_elivira_arell.html

“Why, sir, there is every probability that you will soon be able to tax it.”
Faraday's purported reply to William Gladstone, then British Chancellor of the Exchequer (minister of finance), when asked of the practical value of electricity (1850) as quoted in Democracy and Liberty (1899) by William Edward Hartpole Lecky, p. xxxi , and in Discovery Or The Spirit And Service Of Science (1918) by R.A Gregory, p 3. The variant "One day sir, you may tax it." is given in The Harvest of a Quiet Eye : A Selection of Scientific Quotations (1977), p. 56, but they source it to Discovery which differs in its quote. According to Snopes in "Long Ago and Faraday" http://www.snopes.com/quotes/faraday.asp, it is most likely an invented quotation, as there are no contemporaneous records, though Lecky did live through the same time as Faraday and Gladstone.
Disputed

2009, Speech: The Socio-Economic Peace Program of Senator Francis Escudero

2010s, 2016, September, First presidential debate (September 26, 2016)
From Here to Eternity (1951), p. 668
Context: Why was it everything was always so goddam complicated? Even the simplest things was so goddam complicated when you come to doing them.