Fernandez
“( I mailed the return in with delivery confirmation from USPS ,the IRS claimed they never got it ) Highly recommend, great experience.”
Best Tax Preparation Services in Ontario, CA
21 companies listed · all 21 in Ontario · 9 open weekends · 17 rated 4.5+ · 1 shows a license
Data verified November 2, 2026
One Stop Tax Services
“1st time and can't complain very professional and the most important knowledgeable answered all my questions great customer service will come back.”
Book onlineBook
RCS Tax Group
“I've been doing my taxes with her for a couple decades she's the best in town.”
Aida Real Professional Services
“Every time I had a question she was quick to respond and made everything super clear and understandable.”
Latino's Tax Services
“Been coming here for years never had a problem they make it super simple and effortless”
Mi Oficina
“After so many years we finally found our tax man, Rafael is very knowledgeable and explains in detail, very helpful.”
The 21 companies listed for Ontario, CA prepare and file tax returns for individuals and small businesses. What each says about its services and credentials comes from its own website; ratings and quotes come from public reviews.
Area overview: Ontario, CA
All 21 companies we list here are in Ontario itself. We have 38 companies in Ontario on file; this page shows the highest-rated 21. The companies on this page are rated from 4.4 to 5.0 across 813 reviews; 6 have 50 or more reviews and 17 are rated 4.5 or higher. 9 are open on Saturdays and 2 on Sundays. The services the companies on this page list most often on their websites are tax planning (3), bookkeeping (2), financial planning (2), individuals (2) and view services page (2). 1 shows a license on its website and 12 have a BBB rating of A or A+. Domain records put 5 websites of the companies on this page at ten or more years old; the oldest dates from 2010. 2 offer a free initial consultation; 2 are family- or locally-owned and 1 lists coupons or special offers. We have a website on file for 15 of the companies on this page; 13 publish a contact page; 10 list a public email and 2 take bookings online. We count these figures across the companies on this page; hours and prices change, so confirm the details with the company before you book a consultation.
Are any tax preparers listed for Ontario open on Saturdays or Sundays?
9 of the 21 companies list weekend hours. Extended and weekend opening is common through the filing season and disappears afterward, so the hours shown here may not match what you find in the quiet part of the year. Call before you travel.
Enriquez
“If I have questions during the year regarding anything about my taxes I leave a message and she'll call back.”
Patriot Tax Services
“Everything was handled quickly and accurately, and they even found deductions I would have missed”
Burns Tax & Wealth Management
“Professional, trustworthy friendly and efficient are just a few words that come to mind when describing Burns Tax & Wealth Management.”
Corellia Finance & Tax
“They take the time to listen and answer any questions or concerns you might have regarding your taxes or finances.”
Hongda Tax and Accounting Services
“Been going here for a few years and they've always been able to answer any questions we have about minimizing our tax payments”
Vallarta Express Tax Services
We Care Tax
“I highly recommend this business because they are professional, detail oriented, and they take the time to explain your tax refund to you.”
Villa's Taxes
“We Had an appt with Sally , She made us feel very welcoming Her and her associates .”
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Exquisite Consulting Services
GYL Cpas and Advisors
Cloud Bookkeeping
“They've taken over our accounting systems flawlessly, which has been a huge help.”
LES Tax Services
“Less Tax Services is a great place to learn about income tax services and get your tax license for the first time.”
Elaine's Tax Services
“Great tax service I've been going to her for over ten years.”
Regalado Raymond CPA
“At first stay, a very focused, regal, human person, provides confidence with good moral principles.”
Dollars & Sense
“She will make sure to guide you in the best direction for your situation whether you are a business owner or w2.”
Why these companies made our list
What clients say about companies in Ontario
- “From start to finish, their team provided outstanding professionalism, accuracy, and efficiency in handling my tax filing.” — client of Fernandez
- “Great customer service. Very trustworthy and good timing on my tax returns.” — client of Latino's Tax Services
- “Lucy is excellent with tax return services. I have been going for a few years now.” — client of RCS Tax Group
- “They took the time to thoroughly review my financial situation, ensuring that I received the best possible deductions and credits.” — client of Fernandez
Excerpts from public reviews of the companies listed on this page.
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