Internal Revenue Service
The official site of the IRS. Contains important federal tax information, forms, and publications. Publication 17 is a yearly reference work published by the IRS that covers the general rules for filing a federal income tax return. It supplements the information contained in your tax form instructions. It explains the tax law to make sure you pay only the tax you owe and no more.
Free File: Do your Federal Taxes for Free.
IRS Free File lets you prepare and file your federal income tax online using guided tax preparation, at an IRS partner site or Free File Fillable Forms. It's safe, easy and no cost to you for a federal return.
Link to the Michigan Department of Treasury
Individual income tax forms (MI-1040), etc, are available at this link. Previous years are included.
State Tax Forms. Link to where the forms are for every state.
Federal
1040: [ form ] [ instructions ]
Form 8863 Education Credits [ form ]
Pub 519 Tax Guide for Aliens [ guide ]
Form 1040NR [ form ] [ instructions ] (tax form for U.S. non-resident aliens. Accompanies forms 1040 or 1040A).
All federal forms are listed here.
In the military? The IRS has a Armed Forces Tax Guide.