Publication 535, Business Expenses
This publication discusses common business expenses and explains what is and is not deductible. The chapters cover general rules for deducting business expenses and specific expenses.
Publication 541, Partnerships
This publication provides supplemental federal income tax information for partnerships and partners. It supplements the information provided in the instructions for Form 1065, U. S. Return of Partnership Income, and the Partner’s Instructions for Schedule K-1 (Form 1065).
Publication 542, Corporations
This publication discusses the general tax laws that apply to ordinary domestic corporations.
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 3402, Taxation of Limited Liability Companies
This publication provides federal income, employment, and excise tax information for limited liability companies.