Publication 463, Travel, Entertainment, Gift, and Car Expenses
This publication explains what expenses are deductible, how to report them on your return, what records you need to prove your expenses, and how to treat any expense reimbursements you may receive.
Publication 510, Excise Taxes (Including Fuel Tax Credits and Refunds)
This publication covers the excise taxes for which you may be liable and which are reported on Form 720 and other forms. It also covers fuel tax credits and refunds.
Publication 526, Charitable Contributions
This publication explains how to claim a deduction for charitable contributions. It discusses organizations qualified to receive them, the types of contributions you can deduct, how much you can deduct, what records to keep, and how to report them.
Publication 598, Tax on Unrelated Business Income of Exempt Organizations
This publication covers the rules for the tax on unrelated business income of exempt organizations. It explains which organizations are subject to the tax, the requirements for filing a tax return, what an unrelated trade or business is and how to figure unrelated business taxable income
Publication 925, Passive Activity and At-Risk Rules
This publication discusses the passive activity and at-risk rules that may limit the amount of deductible losses from a trade, business, rental, or other income-producing activity.
Publication 947, Practice Before the IRS and Power of Attorney
This publication discusses who can represent a taxpayer before the IRS and what forms or documents are used to authorize a representative.
Publication 966, Electronic Federal Tax Payment System (EFTPS)
EFTPS is the free Electronic Federal Tax Payment System provided by the U.S. Department of the Treasury.