Source: An exploration in the theory of optimum income taxation, 1971, p. 209
“Some argue that an income tax is unfair because it taxes capital income twice: once when the original income is earned, and again when the investment produces a return.”
Source: Public Finance - International Edition - Sixth Edition, Chapter 19, Taxes on Consumption and Wealth, p. 453
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Harvey S. Rosen 21
American economist 1949Related quotes

“Income tax returns are the most imaginative fiction being written today.”
2012, " The Fair Tax Isn't Fair, It's a Farce http://www.libertyforall.net/?p=7101"

“Life in the Oink Sector,” http://www.ilanamercer.com/phprunner/public_article_list_view.php?editid1=516 WorldNetDaily.com, September 25, 2009.
2000s, 2009

Statement at FOX News Debate
YouTube
2011-05-05
http://youtu.be/QRPrZxHUqsA
2012-02-24
Economic Policy

2000s

“The hardest thing in the world to understand is income taxes.”
Attributed by his friend Leo Mattersdorf, who also said that "From the time Professor Einstein came to this country until his death, I prepared his income tax returns and advised him on his tax problems." In a letter to Time magazine, 22 February 1963. See this post from The Quote Investigator http://quoteinvestigator.com/2011/03/07/einstein-income-taxes/#more-2031 for more background.
Attributed in posthumous publications
“One writer quite cutely remarks that his best work of fiction was his Income Tax Return.”
The Pageant of Life (1964), On Writers

upon passage of supply side tax cuts
[Phil, Magers, http://www.upi.com/archive/view.php?archive=1&StoryID=20030219-071745-7704r, "New Mexico cuts taxes to stimulate economy", United Press International, 2003-02-19, 2006-08-21]

As quoted in The Mammoth Book of Zingers, Quips, and One-Liners (2004) by Geoff Tibballs, p. 264
2000s and attributed from posthumous publications