The following tax forms will be accepted by the IRS in late February or into March after updating forms and completing programming and testing of its processing systems.  A specific date will be announced in the near future.

Form 3800 General Business Credit
Form 4136 Credit for Federal Tax Paid on Fuels
Form 4562 Depreciation and Amortization (Including Information on Listed Property)
Form 5074 Allocation of Individual Income Tax to Guam or the Commonwealth of the Northern Mariana Islands
Form 5471 Information Return of U.S. Persons With Respect to Certain Foreign Corporations
Form 5695 Residential Energy Credits
Form 5735 American Samoa Economic Development Credit 
Form 5884 Work Opportunity Credit
Form 6478 Credit for Alcohol Used as Fuel
Form 6765 Credit for Increasing Research Activities
Form 8396 Mortgage Interest Credit
Form 8582 Passive Activity Loss Limitations
Form 8820 Orphan Drug Credit
Form 8834 Qualified Plug-in Electric and Electric Vehicle Credit
Form 8839 Qualified Adoption Expenses
Form 8844 Empowerment Zone and Renewal Community Employment Credit
Form 8845 Indian Employment Credit
Form 8859 District of Columbia First-Time Homebuyer Credit
Form 8864 Biodiesel and Renewable Diesel Fuels Credit
Form 8874 New Markets Credits
Form 8900 Qualified Railroad Track Maintenance Credit
Form 8903 Domestic Production Activities Deduction
Form 8908 Energy Efficient Home Credit
Form 8909 Energy Efficient Appliance Credit
Form 8910 Alternative Motor Vehicle Credit
Form 8911 Alternative Fuel Vehicle Refueling Property Credit
Form 8912 Credit to Holders of Tax Credit Bonds
Form 8923 Mine Rescue Team Training Credit
Form 8932 Credit for Employer Differential Wage Payments
Form 8936 Qualified Plug-in Electric Drive Motor Vehicle Cred

Income tax returns for individual calendar year taxpayers are due by April 15 of the next year. Should April 15 fall on a Saturday, Sunday, or a legal holiday in Washington D.C. or in the state to which the return is required to be filed, the returns are due on the next business day. For example, in 2012, April 15 is on a Sunday. April 16 is a legal holiday, Emancipation Day, in Washington D.C. Because Monday, April 16, 2012 is a legal holiday in Washington D.C., Form 1040 income tax returns filed on Tuesday, April 17, 2012, will be treated as timely filed on Sunday, April 15, 2012.

Regular Form

The Form 1040 – U.S. Individual Income Tax Return:

It is the starting form for individual federal income tax returns filed with the IRS. It consists of two full pages not counting attachments. It has 11 attachments, called “schedules”, which may need to be filed depending on the taxpayer. The most commonly used schedules are:

• Schedule A – It is used to claim itemizes deductions which are allowable against income. Taxpayers may choose to take a standard deduction instead of an itemize deduction. Basic standard deductions range between $5,800 and $11,600 (for tax year 2011), depending on filing status.
• Schedule B – Enumerates interest and/or dividend income. It is required if either interest or dividends received during the tax year exceed $1,500 from all sources or if the filer had certain foreign accounts.
• Schedule C – Lists income and expenses related to self-employment, and is used by sole proprietors.
• Schedule D – It is used to compute capital gains and losses incurred during the tax year.
• Schedule E  – It is used to report income and expenses arising from the rental of real property, royalties, or from pass-through entities (like trusts, estates, partnerships, or S corporations).
• Schedule SE – It is used to calculate the self-employment tax owed on income from self-employment (such as on a Schedule C, etc.).

There are other, specialized forms that may need to be completed along with Schedules and the Form 1040.

Short forms

The Form 1040A called “short form” – U.S. individual income tax return, is a shorter version of the Form 1040. Use of Form 1040A is limited to taxpayers with taxable income below $100,000 and who take the standard deduction instead of itemizing deductions.

The Form 1040EZ called “easy form” – Income Tax Return for Single and Joint Filers With No Dependents, is the simplest, six-section Federal income tax return. It is used by taxpayers with taxable income below $100,000 (as of tax year 2011) and who take the standard deduction instead of itemizing deductions.

Other

The Form 1040NR – U.S. Nonresident Alien Income Tax Return.

The Form 1040NR-EZ called “easy” – U.S. Income Tax Return for Certain Nonresident Aliens With No Dependents. It is used by nonresident aliens who have U.S. source income and therefore have to file a U.S. tax return. Joint returns are not permitted, so that husband and wife must each file a separate return.

The Form 1040X – Amended U.S. Individual Tax Return. It is used to make corrections to Form 1040, Form 1040A, and Form 1040EZ tax returns that have been previously filed.