What must all employers of one or more persons file for compliance with tax regulations?

For compliance with tax regulations, all employers must file an application for an identification number, also known as an Employer Identification Number (EIN). This number is essential for several reasons: it uniquely identifies the business entity to the Internal Revenue Service (IRS) and is required for the reporting of taxes and for various other compliance responsibilities. The EIN is crucial for filing tax returns, making tax payments, and handling employees’ tax withholdings.

Employers need this identification number to report and pay payroll taxes, including Social Security and Medicare taxes. It's also needed when filing other forms that might be linked to the business’s operations, such as income tax returns or excise tax forms. Thus, obtaining an EIN is a foundational step for businesses when establishing their tax compliance and operational framework.

While the other options relate to specific aspects of tax compliance, they do not serve the same foundational purpose as the identification number. A tax exemption form is more relevant for entities seeking exemption from certain taxes, a withholding statement is related to the amounts taken from an employee’s paycheck for taxes, and a payroll report typically details payroll information but does not establish the employer's identity with tax authorities.