Your Rights as a Taxpayer- Publication 1
Your Rights as a Taxpayer – Publication 1. An important introductory publication that outlines your fundamental rights throughout the tax process, including examination, appeal, and refund processes.

Employer’s Tax Guide – Publication 15 (Circular E)
A critical resource for employers, detailing responsibilities for withholding, depositing, reporting, and paying employment taxes.

Tax Guide for Small Businesses – Publication 334
Essential for self-employed individuals and small business owners (especially those who use Schedule C), this publication covers business income, expenses, and tax credits. 

Accounting Periods and Methods. Publication 538
Explains the rules for choosing a tax year and accounting method (cash vs. accrual).

Partnerships – Publication 541
Explains the tax rules for partnerships 

Corporations – Publication 542
Covers the tax rules that apply to corporations 

Retirement Plans for Small Business - Publication 560
Discusses options for setting up retirement plans (SEP, SIMPLE, etc.) for yourself and employees. 

Starting a Business and Keeping Records - Publication 583
Provides basic federal tax information for new business owners, including recordkeeping systems.

Taxation of Limited Liability Companies - Publication 3402.
Provides federal income, employment, and excise tax information for limited liability companies. Taxation of Limited Liability Companies - Publication 3402. Provides information on how LLCs are taxed.