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Best Tax Attorneys in Ontario, CA

Our Recommended Top 5

We did the research for you!

  • Licensing
  • User Reviews
  • Mystery Shopping Calls

Our goal is to connect people with the best local professionals. We scored Ontario Tax Attorneys on more than 25 variables across five categories, and analyzed the results to give you a hand-picked list of the best.



5Top Picks

Learn about our selection process.


featured provider = Featured Provider

1300 Valley Vista Drive Suite 201, Diamond Bar, CA 91765

Why choose this provider?

Elmer Dean Martin III, A Professional Corporation, provides its services to individuals and businesses in Ontario. The firm offers tax and bankruptcy advice to Chapter 7 and 11 debtors, debtors in possession, trustees, and creditors. Additionally, it serves as an expert witness on bankruptcy tax matters in the Northern and Central Districts of California's bankruptcy courts. Elmer Martin, the firm's owner, has practiced law for more than 52 years. He is also a certified public accountant.

  • Tax Defense

117 E Colorado Blvd #603, Pasadena, CA 91105 Rating

Review Sources

4.9 (29)

Why choose this provider?

Five Star Tax Resolution has been serving Ontario and the surrounding metros for over 22 years. Its team of attorneys, CPAs, and enrolled agents works collectively with clients, helping them find practical tax resolutions when facing IRS audits, collections, and levies. They negotiate offers in compromise and installment agreements and assist with tax reduction planning. Herbert Lo, the lead tax attorney, has extensive experience in tax planning, research, and compliance and previously worked for PricewaterhouseCoopers.

  • State Tax Audit
  • Federal Tax Audit

556 N. Diamond Bar Blvd., Diamond Bar, CA 91765

Why choose this provider?

Socal Tax Law, Inc., offers legal assistance to clients in Ontario. The firm advises taxpayers on their choices for resolving tax-related issues, including installment payment plans, offer in compromise, and the elimination of bank levy and property liens. Its lawyers also assist clients in filing a motion with the Federal Tax Court to bargain a settlement or litigate an IRS issue. One of the firm's team members, Derrick K. Snyder, has worked on thousands of individual, corporate, and tax settlement matters.

  • Cash Intensive Businesses
  • Tax Defense
  • Criminal Tax Audit

144 North Indian Hill Boulevard, Claremont, CA 91711 Rating

Review Sources

5.0 (4)

Why choose this provider?

Taylor, Simonson & Winter LLP Attorneys at Law caters to clients in Ontario. It handles IRS and California tax problems and estate planning and provides business advice. Its tax services include audits and collection matters, wage levies and property seizure, notices of tax deficiency, and tax court litigation. Firm partner Bonnie F. Emadi has been practicing law since 1997. One of her practice areas is the formation of business entities. She also provides legal advice and representation to taxpayers in property tax, income tax, and employment tax affairs.

  • Cash Intensive Businesses
  • Tax Defense

204 Yale Ave., Ste. B, Claremont, CA 91711 Rating

Review Sources

5.0 (2)

Why choose this provider?

Kent Pomeroy Esq., CPA, MBA, provides Ontario residents with tax law representation. Principal lawyer Kent Pomeroy helps individual and business clients in tax return compliance and preparation, tax planning, and tax disputes. In addition, he is also an entrepreneurial advisor who helps create and develop business models and plans. Pomeroy is a mentor who assists in business goal setting, budgeting, leadership development, team building, culture formation, and strategic “rebooting.” He is a business lawyer who has an MBA with a focus on entrepreneurship.

Compare our Top Tax Attorneys

NameExpertise RatingAddressPromotionsLearn more
Elmer Dean Martin III A Professional Corporation
1300 Valley Vista Drive Suite 201, Diamond Bar, CA 91765
Five Star Tax Resolution
117 E Colorado Blvd #603, Pasadena, CA 91105
Socal Tax Law Inc.
556 N. Diamond Bar Blvd., Diamond Bar, CA 91765
Taylor, Simonson & Winter LLP Attorneys at Law
144 North Indian Hill Boulevard, Claremont, CA 91711
Kent Pomeroy Esq., CPA, MBA
204 Yale Ave., Ste. B, Claremont, CA 91711

Disclaimer:  Consumers utilizing are free to communicate and contract with any lawyer they choose. is not involved in the confidential attorney-client relationship. Featured lawyers pay a reasonable advertising cost to market their legal services with and must meet similar selection criteria as other lawyers. All cases are different. Prior results do not guarantee a similar outcome.


  • Where does the Tax Court hold trial sessions closest to Ontario, California?

    The United States Tax Court nearest Ontario is in Los Angeles. It is in Rooms 1167 and 1174 of the Edward R. Roybal Center & Federal Building at 255 E. Temple Street, Los Angeles (90012).

  • Where is the low-income taxpayer clinic that is closest to Ontario, California?

    Call the intake line of the Inland Counties Legal Services at (888) 245-4257 for further details. Its office is located at 3500 Porsche W Suite 200 Ontario, CA 91764.

  • If you cannot qualify for representation at a tax clinic in Ontario, can you represent yourself in tax court?

    You can file a petition in tax court without any representation. You can also appear before a judge or proceed to trial without being represented by an attorney. However, you are required at all times to be mindful of the court notices you receive and follow all the court procedures. Should you encounter problems understanding any instructions, seek assistance in Ontario.

  • What are your options with unfiled tax returns in Ontario?

    Filing an extension request, SFR reconsideration, and penalty relief are some of the options if you have unfiled tax returns in Ontario. You may also enter into a payment plan agreement with the IRS to gradually pay your taxes over time. Another option is Offer in Compromise, which allows you to settle large amounts of tax debts.

  • Can you go to prison if you do not pay your taxes in Ontario?

    It is considered illegal not to pay your taxes up to the correct amount. Depending on your case in Ontario, you could be charged with criminal and civil tax offenses if you do not pay your taxes. In worst cases, the penalty would be imprisonment of up to one year in the state prison or county jail and a fine of up to $20,000.

  • What should you do if you did not receive your tax bill in Ontario?

    Go to the website of the San Bernardino County Tax Collector's Office and download your bill. You can also call a tax specialist at (909) 387-8308 for assistance. Take note that if you fail to pay your Ontario taxes on time because you did not have a bill, you will still pay any penalties and charges for late payment.

  • How can a notice from the IRS affect you in Ontario?

    Do not ignore any notice from the IRS. Address the situation properly and timely. You could face penalties and interests in Ontario if you fail to respond within the deadline indicated in the notice. Request a tax transcript online or through the mail by calling the automated line at 800-908-9946 if you need more detail. There is also a contact information for each notice so get in touch with this contact for more information. You may also call the Taxpayer Advocate Service at 1-877-777-4778 for assistance.