Av. John M. McWilliams

Av. John M. McWilliams

Accounting Beginnings McWS Law is managed by its founder and owner, John M McWilliams, a dual-credentialed Attorney-CPA, who began his career as a Certified Public Accountant (“CPA”) in California at a Big 4 Accounting Firm and has held various management positions at several large public companies. After practicing as a CPA for a decade, he returned to law school, while still actively practicing as a CPA, and obtained his law degree and subsequently his Tax LL.M. and began practicing tax law.

Irvine Irvine 19 Yıl Deneyim 19 yıl
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Profile Summary

About John M. McWilliams at a glance

John M. McWilliams is an Owner and Founding Shareholder based in Irvine, California, practicing at The McWilliams Law Group. They have 19+ years of legal experience, licensed to practice since 2007. Their practice focuses on formation, trusts, estate planning, business, and tax. Admitted to practice in California (2007) and Washington (2011). Educated at Loyola Law School (LL.M. Taxation, 2009) and Ohio State University B.S. Accounting (—). Serands clients in Irvine, CA and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

Hakkında

  • Accounting Beginnings McWS Law is managed by its founder and owner, John M McWilliams, a dual-credentialed Attorney-CPA, who began his career as a Certified Public Accountant (“CPA”) in California at a Big 4 Accounting Firm and has held various management positions at several large public companies
  • After practicing as a CPA for a decade, he returned to law school, while still actively practicing as a CPA, and obtained his law degree and subsequently his Tax LL.M. and began practicing tax law
  • Legal Credentials John is currently licensed to practice law in California and Washington State and is also an active CPA in both these states as well
  • He is admitted to practice before the United States Tax Court, all Courts in California and Washington State, as well as the United States District Courts for the Northern, Central, Eastern and Southern Districts of California
  • John represents clients before the United States Tax Court, Office of Appeals and various courts in California and Washington
  • As Corporate Counsel for businesses in various locations, he advises on corporate governance matters and protects his clients from liability by assisting on matters pertaining to tax and regulatory compliance and disclosures, including domestic and international tax reporting requirements
  • Current Practice and Academic Work John serves on the Corporate and Business Tax Committee for the State Bar of California
  • He is also a member of the tax, estate, trust and probate sections of the Orange County Bar Association and a member of the American Bar Association
  • He also belongs to the American Association of Attorney-Certified Public Accountants and the California Society of CPAs
  • In addition, John is actively expanding his activities to include committees in King County, Washington due to the recent expansion and growth of his Seattle law practice in 2017
  • John serves as an Adjunct Professor at California State University – Fullerton where he teaches federal tax planning, federal tax procedures, and business entities for the Graduate Masters in Taxation Program
  • Recently, he was selected to advise and update the tax curriculum program courses and text content at Colorado State University
  • This includes drafting, revising and publishing updated course teaching materials for its Graduate Tax Program
  • As an Attorney, CPA and Tax Professor, John continues to lead his law firm, McWS Law, applying the principals of both professions and staying abreast of current issues and problems within the tax practice

Practice Areas Explained

John M. McWilliams's Areas of Practice

Each practice area below reflects the types of cases John M. McWilliams handles, with a brief overview of what that area of law covers.

Business Formation

John M. McWilliams is one of 35,584 formation attorneys indexed nationally. Browse formation attorneys in California →

Trusts

John M. McWilliams is one of 104,172 trusts attorneys indexed nationally. Browse trusts attorneys in California →

Estate Planning & Probate

An estate planning attorney prepares wills, trusts, powers of attorney, and healthcare directives to protect your family and pass on your assets.

John M. McWilliams is one of 226,537 estate planning attorneys indexed nationally. Browse estate planning attorneys in California →

Business & Corporate Law

Business attorneys advise founders and growing companies on entity formation, contracts, financing, M&A, and dispute resolution.

John M. McWilliams is one of 501,317 business attorneys indexed nationally. Browse business attorneys in California →

Tax Law

Tax attorneys handle IRS audits, tax debt, international tax, estate planning, and tax court litigation.

John M. McWilliams is one of 85,302 tax attorneys indexed nationally. Browse tax attorneys in California →

Jurisdictional Context

Why local counsel matters in California

Practicing law in California. Legal matters in California are governed by state-specific rules of civil and criminal procedure, statutes of limitations, and substantive law. Cases originating in Irvine are typically filed in the local municipal court or the appropriate California state district court, depending on subject matter and amount in controversy. An attorney licensed in California brings working knowledge of local procedural deadlines, judicial practices in this andnue, and the substantive law that applies to cases brought here. Out-of-state attorneys generally cannot represent clients in California courts without local counsel or pro hac vice admission.

Looking for additional California attorneys? Browse all attorneys in Irvine or all attorneys in California.

Frequently Asked

Common questions about John M. McWilliams

Where is John M. McWilliams's law office located?
John M. McWilliams's law practice is located in Irvine, California. The firm is The McWilliams Law Group. You can contact the office directly through this profile page.
What practice areas does John M. McWilliams handle?
John M. McWilliams focuses on formation, trusts, estate planning, business, tax. Each practice area listed reflects experience handling cases of that type in California.
How long has John M. McWilliams practiced law?
John M. McWilliams has 19+ years of legal experience and has been licensed since 2007.
Where did John M. McWilliams go to law school?
John M. McWilliams earned their education at (LL.M. Taxation, 2009); (—).
How can I contact John M. McWilliams for a consultation?
You can contact John M. McWilliams directly through this profile page. Click "Ask the Attorney" to submit a question, or "Schedule a Consultation" to book a meeting. Most claimed-profile attorneys respond within one business day.

Eğitim

LL.M. Taxation
Loyola Law School
- 2009
Ohio State University B.S. Accounting
- Devam Ediyor

Bar Admissions

California
Admitted: 2007
Washington
Admitted: 2011

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