About Us

  • Offices Of The Tax Lawyer
  • Tax Attorney Credentials
  • About William D. Hartsock, Tax Attorney Inc.
Our Mission
This tax law firm will use its best efforts, full staff and every known applicable law to aggressively protect your rights and interests against the IRS, FTB and EDD in order to reach the most favorable possible outcome in your case.
What we Do?
We prepare outstanding cases through the collections and organization of facts and documents, we create smart strategies based on many years of experience and expertise with tax laws, rules, regulations and procedures to aggressively negotiate the best possible outcome for our clients.
Our Company's Values
This firm prides itself on attaining the lowest negotiated settlement of IRS tax debts, and maximum mitigation of both civil and criminal penalties possible under the internal revenue code and federal sentencing guidelines. We fight for people. We treat clients as members of our own family and we will not rest until you receive the maximum rights and protections available under the law.
Client Guarantee
The Tax Lawyer, William D. Hartsock guarantees that this firm will represent client interests to the best of our ability and to the fullest extent of the law. Including helping clients find ways to minimize attorney's fees. We will work with you to organize your facts and documents into the best case possible and to present your case in the most favorable light possible to the IRS and in tax court.
Where can you find us?
The offices of William D. Hatsock, Tax Attorney Inc are located in North County Coastal San Diego, CA.
Why work with The Tax Lawyer?
That's simple. Because you want to win. You want a tax attorney who is going to aggressively defend your rights and deliver the best possible negotiated settlement. As the Chairman of the San Diego County Bar Association, Pro Se Taxpayer Program, and a tax lawyer with over 25 years experience defending clients before the IRS, you are in good hands with William D. Hartsock.

Our Skills

  • Legal Knowledge
  • Case Preparation
  • Case Presentation
  • Negotiation

After earning a Masters in Taxation   and Juris Doctorate   at the University of San Diego School of Law along with an undergraduate Accounting Degree at the University of Nebraska-Lincoln, Mr. Hartsock became a certified tax law specialist   and founded his practice in 1982. A Certified Tax Law Specialist is the highest designation available to a tax attorney.

To be qualified as a Certified Tax Law Specialist, the California State Bar requires passing a rigorous written examination on technical tax law along with at least 5 years of practice in a broad range of taxation issues including individual, corporate, partnership, limited liabilities companies, and estates and trusts. Also, other tax attorneys, certified public accountants and tax professionals must vouch that you are competent in taxation law before the certified tax specialist designation will be awarded.

Achieving the best possible outcome with the IRS starts with case preparation. This tax law firm will work with you to uncover all of the facts and circumstances surrounding your case, compile and organize all of the necessary documentation and interview witnesses in order to develop a case that will achieve the most favorable outcome possible.
It is critical to use the facts and circumstances of the case to paint you in the most favorable light possible in the eyes of the IRS revenue officer, tax appeals officer or tax court judge. Based on over 25 years of experience this firm is very familiar with the tactics that the IRS will use to attempt to prosecute and with the strategies that can successfully keep them at bay while we build a case and negotiate a successful outcome.
This is a process of negotiations at each and every step along the way. From the very first call with the IRS, to the first meeting with the revenue officer, to negotiating with the appeals officer and in presenting before a judge in tax court, this is a negotiation. It is critical that you have a tax attorney with the knowledge, experience and aggressiveness to win. That is why you need The Tax Lawyer, William D. Hartsock.

Call for a free consultation today at (858)481-4844 or Email us at BillHartsock@TheTaxLawyer.com

We strive to provide Our Clients with care, compassion and aggressive representation every step of the way.
The Tax Lawyer, William D. HartsockThe Tax Lawyer

William D. Hartsock, Esq.

After earning a Masters in Taxation and Juris Doctorate at the University of San Diego School of Law along with an undergraduate Accounting Degree at the University of Nebraska-Lincoln, I became a certified tax law specialist and founded my practice in 1982. Since that time I have successfully represented countless clients as a tax attorney and bankruptcy lawyer specializing in IRS tax problems. While my practice is located in Del Mar, CA, I work with individuals, businesses and corporations throughout Southern California. My tax firm is comprised of Tax Attorneys, CPA’s, Enrolled Agents, Tax Preparers and Bookkeepers that pride ourselves on providing our clients with the most aggressive representation before the IRS available under the law. A Certified Tax Law Specialist is the highest designation available to a tax attorney. To be qualified as a Certified Tax Law Specialist, the California State Bar requires passing a rigorous written examination on technical tax law along with at least 5 years of practice in a broad range of taxation issues including individual, corporate, partnership, limited liabilities companies, and estates and trusts. Also, other tax attorneys, certified public accountants and tax professionals must vouch that you are competent in taxation law before the certified tax specialist designation will be awarded.
  • Certified Tax Specialist
  • Masters In Taxation
  • Juris Doctorate
  • Accounting
  • Tax Attorney
  • 25+ Years Experience As A Tax Lawyer
Sherry McDonaldForensic Accountant

Sherry McDonald

Graduated with a Bachelor of Business Administration in Financial Accounting and went on to earn a Masters in Taxation- with Distinction at National University. With over twenty years practical experience in complex forensic accounting, has handled hundreds of sales and payroll tax audits, negotiated many successful offers in compromise and has had experience in international taxation including offshore entities and controlled foreign corporations.
  • Bachelors in Business Accounting
  • Masters in Taxation
  • Forensic Accounting
  • Audit Specialist
  • International Taxation Expert
Daniel EggermanTax Attorney

Dan Eggerman

Dan Eggerman, tax attorney, graduated magna cum laude from the University of Georgia School of Law where he was awarded the State Bar of Georgia's 2012 Outstanding Tax Student Award. He earned his Masters in Tax Law (LL.M.) from the University of San Diego. Dan joined the California Bar in 2012. Since that time he has continuously defended individuals and businesses before the Internal Revenue Service, Franchise Tax Board, and Employment Development Department. Before joining our firm, he worked in San Francisco where he represented some of the nation's largest companies in complex tax litigation involving income tax, sales tax, property tax, telecommunications, and e-commerce. His practice includes tax collections, including offers in compromise, administrative appeals, offshore disclosures, and state and local tax law.
  • Masters in Taxation
  • Juris Doctorate
  • Tax Compliance
  • Tax Collections
  • Offers In Compromise
  • Administrative Appeals
  • Offshore Disclosures
  • State and Local Tax Law
Sonya DannelsOffice Manager

Sonya Dannels

Sonya Dannels has worked as an office administrator in the fields of tax, law, and real estate for over 12 years. She has been an administrative assistant in real estate sales, an administrative assistant with receiverships at a nationwide litigation firm and an executive administrative assistant for a well established accounting firm in downtown San Diego.  Sonya's continuous motivation and attention to detail ensures every client is a top priority. She is currently studying to receive her PTIN to work towards her E.A. certificate.  She is also learning Spanish and ASL in order to better serve her clients.
  • Business Administration
  • Paralegal
  • Client Satisfaction Specialist
  • Warm Smile
  • Friendly Voice
Aaron LiTax Attorney

Aaron Li

Aaron Y. Li, Esq., has experience defending individuals against Internal Revenue Service, Franchise Tax Board, Employment Development Department, and State Board of Equalization. Prior to entering our firm, Aaron has extensive experience in tax compliance, audits, and estate planning. Aaron’s practice also includes International Tax planning for individuals and corporations. Aaron received his Juris Doctorate and his Masters of Laws in Taxation (LL.M.) from the University of San Diego. Prior to law school, Aaron graduated cum laude from University of California, Riverside with a B.A. in Economics with unofficial emphasis in Accounting. Aaron is fluent in Mandarin Chinese.
  • Masters in Taxation
  • Juris Doctorate
  • B.A. Economics
  • Tax Compliance
  • Audits
  • Estate Planning
  • Fluent in Mandarin
Alexandra RupeTax Accountant

Alexandra Rupe

Alexandra Rupe joined our firm in April 2013. She comes to us with over 10 years of experience working in CPA firms, where her primary focus was in preparing income tax returns for individuals, corporations, partnership and trusts. She also has in depth expertise in small business accounting and financial statement review and analysis, in a variety of industries such as construction, biotech firms, real estate sales and development, medical, food service and non-profit organizations. She has extensive experience with QuickBooks and is ProAdvisor certified. In addition, Alexandra has worked closely with clients and legal counsel in preparation of trust accountings as required by the courts and posseses in depth knowledge of the requirements for this type of reporting. Alexandra’s experience also includes the areas of payroll and employment taxes, informational filings such as 1099 reporting, and has numerous years of experience corresponding with the Internal Revenue Service, Franchise Tax Board, Employment Development Department and State Board of Equalization on these matters. Alexandra received her Bachelors of Science in Accountancy in 2004 and received her Masters of Science in Taxation in 2006, both from National University. Alexandra is also fluent in Spanish.
  • Tax Return Preparation
  • Individuals
  • Corporations
  • Partnerships
  • Trusts
  • Financial Statement Review & Analysis
  • Quickbooks
  • Fluent in Spanish
Peggy KnightOffice Manager

Peggy Knight

Peggy Knight has worked as an office administrator/receptionist in the fields of accounting or law for over 25 years. Peggy’s main field of law is as a paralegal/secretary. She has been a controller with a construction company, handling all the accounting aspects for the company, and an administrative assistant/receptionist of an accounting firm in Downtown San Diego. Peggy’s work product has always been consistent, accurate and dedicated in fulfilling the many responsibilities required of her, with a strong degree of motivation and detail. Peggy strives to make each and every client’s needs her top priority and will always greet you with a warm smile and friendly voice.
  • Paralegal
  • Administration
  • Controller
  • Accounting
  • Client Satisfaction Specialist
  • Warm Smile
  • Friendly Voice
Thida TranAdministrative Assistant

Thida Tran

Graduated from San Diego State University in the Spring of 2008 with a Bachelor of Arts in Psychology. Thida worked with this firm for several years as the Office Manager and specialized in tax return processing, Microsoft Word & Excel. Mastering in Quickbooks. Currently pursuing a Masters of Business Administration at National University.
  • Part of the William D. Hartsock, Tax Attorney Inc. Family