Hongda Tax and Accounting Services
“His availability and openness to answer any question provided me with the trust I need in an accountant”
Best CPAs in Ontario, CA
15 firms listed · 4 in Ontario · 1 open 24/7 · 3 open weekends · 13 rated 4.5+
Data verified October 16, 2026
GYL Cpas and Advisors
Regalado Raymond CPA
“At first stay, a very focused, regal, human person, provides confidence with good moral principles.”
Pangan Benjamin A CPA
Steven J. Tweedlie, CPA
Cates & Associates, Cpas
The 15 firms listed for Ontario, CA are accounting practices that serve businesses and organizations. What each states about its CPA license and assurance work comes from its own website; ratings and quotes come from public reviews.
Area overview: Ontario, CA
4 of the 15 firms we list are based in Ontario; the other 11 serve Ontario from towns including Corona (13 mi), Chino (5 mi) and Rancho Cucamonga (6 mi). The firms on this page are rated from 4.3 to 5.0 across 125 reviews; 13 are rated 4.5 or higher. 1 is open around the clock; 3 are open on Saturdays and 1 on Sundays. The services the firms on this page list most often on their websites are business services (5), services for individuals (5), tax services (5), accounting services (3) and tax planning (3). 2 show a license on their websites and 6 have a BBB rating of A or A+. Domain records put 12 websites of the firms on this page at ten or more years old; the oldest dates from 1999. 1 offers urgent consultations; 4 offer payment plans; 8 offer a free initial consultation and 1 is family- or locally-owned. We have a website on file for all 15 of the firms on this page; all 15 publish a contact page and 11 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.
Do any accounting firms listed for Ontario offer a free scoping call?
An initial consultation is offered without charge by 8 of the 15 firms. For assurance work that call is about scope and timing rather than advice, and it usually ends with a request list. Have the requirement letter from your lender or funder in front of you.
Ayoub & Associates CPA Firm
“I had a bad year financially, I had put taxes aside and was just worried about what the damage would be, turned out I was way ahead because I followed his advice, setup numerous things he told me to do, and when everything was said & done, I ended up with a refund”
Smartcpa - Chino Hills
“From friendly, detail-oriented staffs to quick response to critical questions and all the assistance needed to be in the IRS good books.”
Desi Tax & Bookkeeping
“But @ Desi Tax, its a pleasant experience@ Desi, consultation is easy, price is simple, people are honest, submission is online.”
Ayoub, Sidhum & Co.
“I've also called a few times before coming in to make sure I have everything I need (5+ times) which I'm sure is probably time consuming during the tax season but when someone answers they are always willing to help with an upbeat reaction.”
Epay Payroll
“One thing I noticed and a major reason I went with Epay payroll is that each plan is tailored for your business plans.”
Fox & Stephens, Cpas
“I always see Bill Laubach, such a good experience.”
James K CHU CPA
“Helped me save so much money on my personal and business taxes!!!”
Kalter Financial Group
“And I have never once had a problem, been in any way disappointed, or walked out less than satisfied with my tax results.”
Burns & Johnston, Cpas & Business Advisors
Why these companies made our list
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