Pub. 15 / Circular E explains your tax responsibilities as an employer. It explains the requirements for withholding, depositing, reporting, paying, and correcting employment taxes. It explains the forms you must give to your employees, those your employees must give to you, and those you must send to the IRS and the SSA. This guide also has tax tables you need to figure the taxes to withhold from each employee for 2017. References to "income tax" in this guide apply only to "federal" income tax. Contact your state or local tax department to determine if their rules are different. When you pay your employees, you don't pay them all the money they earned. As their employer, you have the added responsibility of withholding taxes from their paychecks. The federal income tax and employees' share of social security and Medicare taxes that you withhold from your employees' paychecks are part of their wages that you pay to the United States Treasury instead of to your employees. Your employees trust that you pay the with-held taxes to the United States Treasury by making federal tax deposits. This is the reason that these withheld taxes are called trust fund taxes. If federal income, social security, or Medicare taxes that must be withheld aren't withheld or aren't deposited or paid to the United States Treasury, the trust fund recovery penalty may apply. See section 11 for more information. Pub. 15-A includes specialized information supplementing the basic employment tax information pro-vided in this publication. Pub. 15-B, Employer's Tax Guide to Fringe Benefits, contains information about the employment tax treatment and valuation of various types of non-cash compensation. Pub. 535 discusses common business expenses and explains what is and is not deductible. The general rules for deducting business expenses are discussed in the opening chapter. The chapters that follow cover specific expenses and list other publications and forms you may need.

The Tax Foundation's State Business Tax Climate Index enables business leaders, government policymakers, and taxpayers to gauge how their states' tax systems compare. While there are many ways to show how much is collected in taxes by state governments, the Index is designed to show how well states structure their tax systems, and provides a roadmap to improving these structures.