Fernandez
“Brianna, you were wonderful and definitely my go to person for the rest of tax paying years haha!”
Best Accountants in Ontario, CA
15 firms listed · 13 in Ontario · 5 open weekends · 11 rated 4.5+
Data verified October 18, 2026
Hongda Tax and Accounting Services
“Highly recommend been getting my taxes done with them for the last 9 years and never had no issues always professional best in the business”
Merchants Bookkeeping
“If you need your company or business financial papers in order, this is the place to come.”
Exquisite Consulting Services
GYL Cpas and Advisors
Cloud Bookkeeping
“They've taken over our accounting systems flawlessly, which has been a huge help.”
The 15 firms listed for Ontario, CA prepare accounts, statements and returns for businesses and individuals. What each says about its services and software comes from its own website; ratings and quotes come from public reviews.
Area overview: Ontario, CA
Of the 15 firms we list here, 13 are in Ontario itself and 2 come from Rancho Cucamonga (1, 6 mi) and Fontana (1, 9 mi). 12 of the firms on this page have a rating, from 4.2 to 5.0 across 161 reviews; 11 are rated 4.5 or higher. 5 are open on Saturdays. The services the firms on this page list most often on their websites are tax planning (3), accounting & bookkeeping (2), bookkeeping (2) and business consulting (2). 3 have a BBB rating of A or A+. Domain records put 9 websites of the firms on this page at ten or more years old; the oldest dates from 1997. 3 offer a free initial consultation and 1 is family- or locally-owned. We have a website on file for 13 of the firms on this page; 11 publish a contact page and 7 list a public email. We count these figures across the firms on this page; distances are straight-line, and hours and prices change, so confirm the details with the firm before you book a consultation.
Why are accounting firms outside Ontario listed on this page?
Inside Ontario itself the count is 13 of the 15 firms. The remainder come from other towns within 15 mi. Accounting work travels well, so the relevant question is usually state and industry rather than distance. Distances are straight-line.
Regalado Raymond CPA
“At first stay, a very focused, regal, human person, provides confidence with good moral principles.”
Eagle TAX & Notary Public Services
“I highly recommend her service to people who want to have their taxes done right!”
B. Chacon Associates
Pondillo Tax Services
“Thank you for making our lives easier with your organized service!”
Singh Tax & Accounting
“Helped us understand our financials and assisted with tax planning.”
Advantage Tax Services
G Lewis & Associates
Casa Hispana
“Excellent Service and Professional attention from the people who work here, very friendly and 100% recommendable.”
Whyte & Associates
“A great CPA firm , very professional, Knowledgeable and friendly that provides an excellent service in all accounting areas; I can tell that Steve service saves me thousands of dollars after his consultation and analysis ; the best recommendations for this Office”
Why these companies made our list
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