A unique number assigned by the IRS to tax professionals who are authorized to e-file tax returns. It is used to identify the e-filer and must be included on all electronically filed returns.

A number issued by the IRS to tax preparers who are paid to prepare federal tax returns. It is required for anyone who prepares or assists in preparing federal tax returns for compensation.

A company that provides various services, including tax preparation and filing, payroll processing, and other financial services to businesses. They allow businesses to outsource these tasks to focus on their core operations.

A tax form that employers use to report wages paid to employees and the taxes withheld from those wages. Employees use the W-2 to file their personal income tax returns.

A tax form used to report income, deductions, and credits from partnerships, S corporations, estates, and trusts. It informs partners or shareholders of their share of income to report on their personal tax returns.

The standard individual income tax return form used by U.S. taxpayers to report their income, claim tax deductions and credits, and calculate their tax liability.

An expense that can be deducted from a taxpayer's total income to reduce the amount of income that is subject to tax. Common deductions include mortgage interest, student loan interest, and charitable contributions.

A dollar-for-dollar reduction in the amount of tax owed. Tax credits can significantly reduce a taxpayer's tax liability and may be refundable or non-refundable.

A category that determines the rate at which income is taxed and the standard deduction amount. Common filing statuses include Single, Married Filing Jointly, and Head of Household.

The total income of a taxpayer minus specific deductions. AGI is used to determine eligibility for certain tax credits and deductions.