The Internal Revenue Service (IRS)  collects revenue for the United States federal government. The IRS taxes income, and the IRS nickname of “Income Reduction Service” has been used infrequently since at least 1990.
 
The IRS has also been nicknamed the “Infernal Revenue Service” (cited in print since at least 1956), “Internal Rectal Service” (used by Congressman James Traficant in 2000), “Internal Rotten Scoundrels” (cited at an “Abolish the IRS” rally in 2013), “Internal Revenge Service” (popular since April and May 2013), “IRSS” (IRS + SS, popular since May 2013) and “Immoral Robbery Service” (printed on shirts in 2017).
         
 
Wikipedia: Internal Revenue Service
The Internal Revenue Service (IRS) is the revenue service of the United States federal government. The government agency is a bureau of the Department of the Treasury, and is under the immediate direction of the Commissioner of Internal Revenue. The IRS is responsible for collecting taxes and the administration of the Internal Revenue Code. It has also overseen various benefit programs, and enforces portions of the Affordable Care Act.
 
The first income tax was assessed in 1862 to raise funds for the American Civil War, with a rate of 3%. Today the IRS collects over $2.4 trillion each tax year. It processes around 234 million tax returns annually.
 
Google Groups: rec.humor
The acronym list (long)
sean lamb
6/6/90
(...)
IRS:
Income Reduction Service.
 
Google News Archive
27 October 1993, Ludington (MI) Daily News, “High earners pack list of those who failed to file taxes” (AP), pg. 2, col. 4:
“To them, IRS stands for ‘Income Reduction Service’ and they don’t want any part of it.”
(Rep. J. J. Pickle, D-Texas.—ed.)
 
The Firing Line Forums
Thanks, Income Reduction Service
Jeff, CA
April 12, 2001, 10:33 PM
Looks like it’s no new toys for me for the next few months. I have to cough up an additional $3000.
 
Twitter
Random Tagline
‏@randomtagline
IRS, n. - Income Reduction Service
7:37 AM - 3 Jun 2009
 
Twitter
Linda C. Hamilton
‏@lchamilton76
IRS= Income Reduction Service Infernal Revenue Service
12:27 AM - 24 Feb 2013
 
Facebook
If it were up to me…
May 2, 2013 ·
The IRS would be renamed to the Income Reduction Service, in the interest of truth in advertising.