What tax bracket are you in? How much to withold? What is a FICA? Do I pay estimated taxes? How bad are the penalties? What are all the tax forms? What is a alternative minimum tax? Can I get audited? When to start tax planning?

People who work as contractors or get a lot of investment income should probably pay estimated taxes. Also, if you

Tax estimates are due four times a year and filed via IRS Form 1040-ES. (April 15, June 15, Sept. 15, and Jan. 15)

Jan 31		If you haven't paid your 4th quarter estimated tax , you can opt to file last year's return by Jan 31.
Feb 17		If you claimed exemption from withholding last year, you need to file a new W-4 to continue the exemption.
Apr 15		Taxes are Due
Dec 31		Last day to setup most self-employed retirement accounts.