Form 1040X, Amended U.S. Individual Income Tax Return
Individual taxpayers file this form to amend a tax return.
Form 1045, Application for Tentative Refund
An individual, estate, or trust files this form to apply for a quick tax refund.
Form 1139, Corporation Application for Tentative Refund
Corporations (other than S corporations) use this form to apply for a quick refund of taxes from: carryback of a net operating loss, net capital loss, unused general business credit, or an overpayment of tax from a claim of right adjustment.
Form 3115, Application for Change in Accounting Method
File this form to request a change in either an overall method of accounting or the accounting treatment of any item.
Publication 525, Taxable and Nontaxable Income
This publication discusses many kinds of income and explains whether they are taxable or nontaxable.
Publication 536, Net Operating Losses (NOLs) for Individuals, Estates, and Trusts
If your deductions for the year are more than your income for the year, you may have a net operating loss (NOL). This publication discusses NOLs for individuals, estates, and trusts.
Publication 544, Sales and Other Dispositions of Assets
This publication explains the tax rules that apply when you dispose of property.
Publication 550, Investment Income and Expenses
This publication provides information on the tax treatment of investment income and expenses, including information for individual shareholders of mutual funds or other regulated investment companies, such as money market funds.
Publication 556, Examination of Returns, Appeal Rights, and Claims for Refund
This publication discusses general rules and procedures that the IRS follows in examinations, what happens during an examination, your appeal rights, and how to file a claim for refund of tax you already paid.
Schedule C (Form 1040), Profit or Loss From Business
Use this schedule to report income or loss from a business you operated or a profession you practiced as a sole proprietor. An activity qualifies as a business if your primary purpose for engaging in the activity is for income or profit and you are involved in the activity with continuity and regularity.