Deloitte United States
Big Four firm
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In the United States, tax preparation and representation are regulated at both the federal and state levels. The IRS oversees federally authorized practitioners, while state boards license Certified Public Accountants and attorneys who may also practice before the IRS.
Membership organizations and regulators that set standards or license practitioners in United States. Always confirm current standing through each body’s official directory.
Professional membership organization for CPAs. State boards of accountancy issue the CPA license; the AICPA sets professional standards and ethics.
Professional membership organization for Enrolled Agents. The IRS grants EA status via examination or IRS employment experience; NAEA provides member support and continuing education.
The IRS Return Preparer Office administers the Preparer Tax Identification Number (PTIN) requirement, the Annual Filing Season Program (AFSP), and the Enrolled Agent credential. The public directory lists credentialed preparers authorized to represent taxpayers.
Internal Revenue Service (IRS)
The government body responsible for tax collection and administration in United States. Confirm filing requirements, deadlines, and any practitioner register through its official channels.
Official tax authority siteBefore you hand over documents, confirm the preparer’s credentials against the official source.
Step 1: Confirm the preparer holds a valid PTIN by asking to see their PTIN number and verifying it begins with the letter P followed by eight digits; all paid preparers must have one.
Step 2: Search the IRS Return Preparer Office directory at irs.treasury.gov/rpo/rpo.jsf to check whether the preparer is credentialed (EA, CPA, or attorney) and holds current representation rights before the IRS.
Step 3: For a CPA, verify the license is active through the National Association of State Boards of Accountancy CPA Verify tool at cpaverify.org, which covers licensees in participating states.
Big Four firm
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PricewaterhouseCoopers LLP (US)
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Grant Thornton LLP (US)
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These firms are compiled from official registries and public sources and are shown for information — a listing is not an endorsement, and unclaimed listings have not been confirmed by the firm. Firms can claim and verify their profile.
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Informational directory only — TaxPros Rated summarizes neutral, source-cited information about professional credentials and does not provide individualized guidance. Confirm current credential standing through each body’s official directory before engaging a professional.