What does IRS stand for?
AnswerInternal Revenue Service
The IRS is the US federal tax agency.
Money · Facts & stats
IRS facts & stats
7 fact-checked facts about US tax history and tax-form basics, each with the reason behind it. 5 more are in today's round and join this page after it closes.
The basics
What is Form 1040?
AnswerThe US individual income tax return
Most individuals file their federal return on Form 1040.
Going deeper
Which constitutional amendment, ratified in 1913, allowed a federal income tax?
AnswerThe 16th Amendment
The 16th Amendment permits taxing incomes without apportionment.
Who is Form W-4 given to?
AnswerAn employer, to set withholding
Employees fill out a W-4 so employers know how much to withhold.
The first US federal income tax was created to help pay for which war?
AnswerThe Civil War
Congress passed an income tax in 1861 to fund the Civil War.
Expert level
Before 1955, the usual federal filing deadline was which date?
AnswerMarch 15
The deadline moved from March 15 to April 15 in 1955.
What does EIN stand for?
AnswerEmployer Identification Number
An EIN identifies a business for tax purposes.
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