Accountants in Ontario, CA — 52 Top-Rated Firms (2026)
We list 52 accounting firms in Ontario, California that have a website and a public review record — 26 tax preparers, 15 CPA firms, 8 financial planners, and 3 bookkeepers. 46 hold a Google rating of 4.5★ or higher, and the average across the 52 rated firms here is 4.65★. They are sorted by Google rating and review count; use the service links above to narrow the list.
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By service in Ontario
The highest-rated firm in Ontario is ACE Cash Express (5.0★, 506 reviews). 46 of 52 rated firms hold a 4.5★ or higher Google rating.
AC
ACE Cash Express✓ Verified
Tax PreparationOntario, CA
Tax Preparation in Ontario, California offering tax preparation. Rated 5.0★ across 506 Google reviews.
MA
Tax PreparationOntario, CA
Tax Preparation in Ontario, California offering tax preparation. Rated 5.0★ across 47 Google reviews.
CA
CPA FirmOntario, CA
CPA Firm in Ontario, California offering bookkeeping, and tax preparation. Rated 5.0★ across 41 Google reviews.
BC
Bollman Consulting✓ Verified
AccountantOntario, CA
Accountant in Ontario, California offering accounting. Rated 5.0★ across 30 Google reviews.
IF
Integrity Financial & Insurance Services✓ Verified
Financial PlanningOntario, CA
Financial Planning in Ontario, California offering financial planning. Rated 5.0★ across 30 Google reviews.
RC
CPA FirmOntario, CA
CPA Firm in Ontario, California offering advisory. Rated 5.0★ across 25 Google reviews.
MC
CPA FirmOntario, CA
CPA Firm in Ontario, California offering bookkeeping, tax planning, and advisory. Rated 5.0★ across 23 Google reviews.
JT
Jewels Taxes and Bookkeeping✓ Verified
BookkeepingOntario, CA
Bookkeeping in Ontario, California offering bookkeeping, tax preparation, and advisory. Rated 5.0★ across 12 Google reviews.
MI
Monumental Insurance✓ Verified
Tax PreparationOntario, CA
Tax Preparation in Ontario, California offering tax preparation. Rated 5.0★ across 12 Google reviews.
ET
EAGLE TAX & NOTARY PUBLIC SERVICES✓ Verified
BookkeepingOntario, CA
Bookkeeping in Ontario, California offering bookkeeping, tax preparation, and advisory. Rated 5.0★ across 10 Google reviews.
RA
RFS Accounting and Taxes✓ Verified
Tax PreparationOntario, CA
Tax Preparation in Ontario, California offering tax planning, and advisory. Rated 5.0★ across 10 Google reviews.
CF
Tax PreparationOntario, CA
Tax Preparation in Ontario, California offering tax preparation. Rated 5.0★ across 9 Google reviews.
SC
SB CPA INC✓ Verified
CPA FirmOntario, CA
CPA Firm in Ontario, California offering accounting & tax. Rated 5.0★ across 9 Google reviews.
WI
Wealth Integrity Partners✓ Verified
Financial PlanningOntario, CA
Financial Planning in Ontario, California offering financial planning. Rated 5.0★ across 8 Google reviews.
OS
One Stop Tax Services✓ Verified
Tax PreparationOntario, CA
Tax Preparation in Ontario, California offering tax preparation. Rated 5.0★ across 7 Google reviews.
WC
We Care Tax LLC✓ Verified
BookkeepingOntario, CA
Bookkeeping in Ontario, California offering bookkeeping, payroll, and tax preparation. Rated 5.0★ across 7 Google reviews.
SC
Stone Creek Tax Relief✓ Verified
Tax PreparationOntario, CA
Tax Preparation in Ontario, California offering tax preparation. Rated 5.0★ across 5 Google reviews.
EB
CPA FirmOntario, CA
CPA Firm in Ontario, California offering audit & assurance, and advisory.
GC
CPA FirmOntario, CA
CPA Firm in Ontario, California offering tax planning, and advisory.
PB
CPA FirmOntario, CA
CPA Firm in Ontario, California offering accounting & tax.
RM
CPA FirmOntario, CA
CPA Firm in Ontario, California offering accounting & tax.
FA
Fiesta Auto Insurance & Tax Service✓ Verified
Tax PreparationOntario, CA
Tax Preparation in Ontario, California offering tax preparation. Rated 4.9★ across 497 Google reviews.
FW
Falcon Wealth Planning✓ Verified
Financial PlanningOntario, CA
Financial Planning in Ontario, California offering financial planning. Rated 4.9★ across 287 Google reviews.
RT
RCS Tax Group✓ Verified
Tax PreparationOntario, CA
Tax Preparation in Ontario, California offering tax preparation. Rated 4.9★ across 198 Google reviews.
FI
Fernandez Income Tax✓ Verified
Tax PreparationOntario, CA
Tax Preparation in Ontario, California offering tax preparation, tax planning, and advisory. Rated 4.9★ across 175 Google reviews.
MF
MILES Financial Group✓ Verified
Financial PlanningOntario, CA
Financial Planning in Ontario, California offering financial planning. Rated 4.9★ across 54 Google reviews.
HT
Hongda Tax and Accounting Services✓ Verified
CPA FirmOntario, CA
CPA Firm in Ontario, California offering tax preparation. Rated 4.9★ across 29 Google reviews.
TG
TurboTax - Guasti, Ontario✓ Verified
Tax PreparationOntario, CA
Tax Preparation in Ontario, California offering tax preparation, tax planning, and advisory. Rated 4.9★ across 22 Google reviews.
PF
Financial PlanningOntario, CA
Financial Planning in Ontario, California offering financial planning, and advisory. Rated 4.9★ across 14 Google reviews.
AC
ACE Cash Express✓ Verified
Tax PreparationOntario, CA
Tax Preparation in Ontario, California offering tax preparation. Rated 4.8★ across 415 Google reviews.
JH
Jackson Hewitt Tax Service✓ Verified
Tax PreparationOntario, CA
Tax Preparation in Ontario, California offering tax preparation, tax planning, and advisory. Rated 4.8★ across 126 Google reviews.
XA
Xel Advisors, CPA✓ Verified
CPA FirmOntario, CA
CPA Firm in Ontario, California offering accounting & tax. Rated 4.8★ across 43 Google reviews.
NB
NARDOS BUSINESS SERVICES LLC✓ Verified
Tax PreparationOntario, CA
Tax Preparation in Ontario, California offering tax preparation. Rated 4.8★ across 25 Google reviews.
1C
1st CHOICE TAX PREPARATION✓ Verified
Tax PreparationOntario, CA
Tax Preparation in Ontario, California offering tax preparation. Rated 4.8★ across 23 Google reviews.
RB
Reyes Bookkeeping & Income Tax✓ Verified
Tax PreparationOntario, CA
Tax Preparation in Ontario, California offering payroll, and tax preparation. Rated 4.8★ across 15 Google reviews.
PI
Pierpont Investment Group✓ Verified
Financial PlanningOntario, CA
Financial Planning in Ontario, California offering financial planning. Rated 4.8★ across 5 Google reviews.
LT
Liberty Tax✓ Verified
Tax PreparationOntario, CA
Tax Preparation in Ontario, California offering tax preparation, tax planning, and advisory. Rated 4.7★ across 125 Google reviews.
AR
Aida Real Professional Services✓ Verified
Tax PreparationOntario, CA
Tax Preparation in Ontario, California offering tax preparation. Rated 4.7★ across 108 Google reviews.
MO
Mi Oficina Income Tax & Insurance✓ Verified
Tax PreparationOntario, CA
Tax Preparation in Ontario, California offering tax preparation. Rated 4.6★ across 52 Google reviews.
AT
Americanas Travel & Multiservices, Inc.✓ Verified
Tax PreparationOntario, CA
Tax Preparation in Ontario, California offering tax preparation. Rated 4.5★ across 17 Google reviews.
BR
Tax PreparationOntario, CA
Tax Preparation in Ontario, California offering tax preparation. Rated 4.5★ across 6 Google reviews.
EI
Enriquez Income Tax✓ Verified
Tax PreparationOntario, CA
Tax Preparation in Ontario, California offering tax preparation. Rated 4.4★ across 57 Google reviews.
MI
Moreno's Income Tax Services✓ Verified
Tax PreparationOntario, CA
Tax Preparation in Ontario, California offering tax preparation. Rated 4.4★ across 33 Google reviews.
PI
Panamericana Income Tax - Ontario✓ Verified
Tax PreparationOntario, CA
Tax Preparation in Ontario, California offering tax preparation. Rated 3.3★ across 13 Google reviews.
BO
Bank of America (with Drive-thru ATM)✓ Verified
Financial PlanningOntario, CA
Financial Planning in Ontario, California offering financial planning, and advisory. Rated 2.0★ across 116 Google reviews.
Top accounting firms in Ontario
| # | Firm | Service | Rating | Reviews |
|---|---|---|---|---|
| 1 | ACE Cash Express✓ | Tax Preparation | ★ 5.0 | 506 |
| 2 | Madero Accountancy Practice, PC✓ | Tax Preparation | ★ 5.0 | 47 |
| 3 | Cifuentes & Associates Ltd. Liability Co.✓ | CPA Firm | ★ 5.0 | 41 |
| 4 | Bollman Consulting✓ | Accountant | ★ 5.0 | 30 |
| 5 | Integrity Financial & Insurance Services✓ | Financial Planning | ★ 5.0 | 30 |
More firms in Ontario
- Gollaz Tax ServiceTax Preparation★ 5.0 (5)+1909-821-0000
- Burns Tax & Wealth ManagementTax Preparation★ 5.0 (4)+1951-734-5879Website ↗
- Kelly Accounting & AssociatesCPA Firm★ 5.0 (4)+1909-687-7017Website ↗
- Pondillo Tax ServicesAccountant★ 5.0 (4)+1909-755-1000
- Techruit IncBookkeeping★ 5.0 (4)+1951-527-7279
- Cloud Bookkeeping, Inc.Bookkeeping★ 5.0 (3)+1909-952-3804Website ↗
- Merchants BookkeepingAccountant★ 5.0 (3)+1909-983-0652Website ↗
- Merrill Lynch Wealth ManagementFinancial Planning★ 5.0 (3)+1909-476-5100Website ↗
- Metin Oruc, EATax Preparation★ 5.0 (3)+1909-767-3319Website ↗
- Regalado Raymond CPAAccountant★ 5.0 (3)+1909-988-6551
- SDDS Computer Accounting, Tax Preparation ServiceTax Preparation★ 5.0 (3)+1909-987-2408Website ↗
- Tara Sibrian - ThriventFinancial Planning★ 5.0 (3)+1909-920-5303Website ↗
- ANDRADE TAX SERVICESTax Preparation★ 5.0 (2)+1909-730-9655
- Freedom Bookkeeping LLCAccountant★ 5.0 (2)+1909-921-5656Website ↗
- Singh Tax & AccountingCPA Firm★ 5.0 (2)+1844-362-6660
- Vallarta Express Tax ServicesTax Preparation★ 5.0 (2)+1909-467-9898
- Alvarez Taxes & BookkeepingTax Preparation★ 5.0 (1)+1909-459-1472
- Axcess 1 FinancialFinancial Planning★ 5.0 (1)+1909-975-4407
- B P Financial GroupFinancial Planning★ 5.0 (1)+1909-944-8820Website ↗
- California Security Insurance ServicesFinancial Planning★ 5.0 (1)+1909-986-7322Website ↗
- Exquisite Consulting Services LLCTax Preparation★ 5.0 (1)+1800-780-3306Website ↗
- Frank & AssoicatesTax Preparation★ 5.0 (1)+1909-271-9980
- Frank Pickett - Raymond JamesFinancial Planning★ 5.0 (1)+1909-931-7500Website ↗
- GABRIEL'S MULTISERVICESTax Preparation★ 5.0 (1)+1909-391-2998
- Incyte Financial Tax Advisors in OntarioTax Preparation★ 5.0 (1)+1909-222-6733Website ↗
- Jabez Financial ServicesTax Preparation★ 5.0 (1)+1909-701-3403
- Kevin Webb - ThriventFinancial Planning★ 5.0 (1)+1909-945-4996Website ↗
- Ledger MasteryBookkeeping★ 5.0 (1)+1949-295-3447Website ↗
- M&D Professional Services, IncTax Preparation★ 5.0 (1)+1909-986-8372Website ↗
- Northwestern Mutual - OntarioFinancial Planning★ 5.0 (1)+1909-757-6933Website ↗
- Robert Bell - ThriventFinancial Planning★ 5.0 (1)+1909-920-5303Website ↗
- Ros Ta's Income TaxAccountant★ 5.0 (1)
- Latino's Tax ServicesTax Preparation★ 4.9 (71)+1909-986-1844
- Gloria's TravelTax Preparation★ 4.9 (15)+1909-391-4060
- Chapman Tax and Business ServicesBookkeeping★ 4.8 (6)+1909-921-1734
- Patriot Tax ServicesTax Preparation★ 4.6 (41)+1909-391-3992
- Rojas Enterprises - Maria Rojas OfficeTax Preparation★ 4.6 (15)+1909-986-6058
- Villa's TaxesTax Preparation★ 4.4 (22)+1909-983-6442
- LES Tax ServicesTax Preparation★ 4.4 (14)+1909-689-7081
- Zamora's ServiceTax Preparation★ 4.4 (11)+1909-481-3500
- Elaine's Tax ServicesTax Preparation★ 4.4 (7)+1909-391-3922
- Offices of Arshad M. Farooq, JD, CPACPA Firm★ 4.4 (5)+1909-238-5361
- De Bonnett Tax ServiceTax Preparation★ 4.3 (12)+1909-673-0451
- CLA (CliftonLarsonAllen)CPA Firm★ 4.3 (3)+1909-985-7286Website ↗
- Island Tax ServiceBookkeeping★ 4.1 (41)+1909-786-1516
- Rojas EnterprisesTax Preparation★ 4.1 (18)+1909-467-9814
- Marthas Income TaxTax Preparation★ 4.1 (14)+1909-395-9258
- Ale Insurance, income tax & Vehicle Registration ServicesTax Preparation★ 4.0 (36)+1909-984-2264
- De Koekkoek DavidTax Preparation★ 4.0 (1)+1909-467-5433Website ↗
- Tax ServicesTax Preparation★ 3.0 (6)+1909-374-3223
- Jedy Income TaxTax Preparation★ 3.0 (4)
- James E. Hall, CPACPA Firm★ 3.0 (2)
- M & D Professional ServicesTax Preparation★ 3.0 (2)
- Joey's Income Tax and Accounting ServicesAccountant★ 2.3 (3)+1909-456-8875
- Mac Burney Jr Robert a CPAAccountant★ 2.3 (3)+1626-859-3444Website ↗
- Ultimate Tax ExpertsTax Preparation★ 1.0 (3)+1951-426-4250Website ↗
- Community Asset ManagementFinancial Planning★ 1.0 (2)+1909-673-0777Website ↗
- Connie taxesTax Preparation★ 1.0 (1)+1626-627-5947
- Cortez & Associates LLCCPA Firm★ 1.0 (1)+1909-728-9302
- ICM Financial - An Inland Empire Financial Advisor FirmFinancial Planning★ 1.0 (1)+1909-948-1608Website ↗
- Kalayjian Financial ServicesTax Preparation★ 1.0 (1)+1909-986-8519
- Tax Preparation, CPA, Financial Advisor, MedicareCPA Firm★ 1.0 (1)+1909-360-4000Website ↗
- C&S Financial Services CoTax Preparation+1 626-321-3707
- Capin Crouse LLPTax PreparationWebsite ↗
- Clifton Larson Allen, LLPTax Preparation+1 909-658-7059Website ↗
- CliftonLarsonAllen LLPTax Preparation+1 909-857-7300Website ↗
- Corellia CPA LLPCPA Firm+1 949-228-9331
- David Martin, CPACPA Firm+1 951-317-7049
- Derek K Nakagawa CPACPA Firm+1 949-375-1280
- Falcon Tax & Consulting, LLPTax Preparation+1 844-963-2526Website ↗
- First Integrity Tax LLCTax Preparation+1 440-708-6888
- Fortune Accounting & Tax CPA, INCCPA Firm+1 909-377-5161
- Freshair Int'l Business Consulting GroupTax Preparation+1 626-313-2554
- Genske, Mulder & Company, LLCTax Preparation+1 909-483-2100Website ↗
- Gregory L. Hahn CPACPA Firm+1 909-984-5131
- Ks Accountancy CPA INCCPA Firm+1 626-977-9341
- M. Todd Wester, CPACPA Firm+1 909-988-9104
- Martha S Income Tax ServicesTax Preparation+1 951-375-1839
- Orma Haywood, CPACPA Firm+1 951-545-1848
- Rammell & CompanyTax Preparation+1 909-466-5800Website ↗
- S. Richman Company CPAsCPA Firm+1 909-702-9165
- Wise Solutions Accountancy CorpAccountant+1 951-310-6232
How to choose an accountant in Ontario
- ✓Verify credentials — a CPA holds a state Board of Accountancy license; a tax preparer should have a valid IRS PTIN and, ideally, an EA (Enrolled Agent) designation.
- ✓Match the specialty to your needs — small-business tax, S-corp/LLC filings, bookkeeping, or personal returns are different skill sets.
- ✓Confirm they e-file and use current software, and ask how they handle IRS notices or audits.
- ✓Get the fee structure in writing — hourly, flat per-return, or monthly retainer — before engaging.
- ✓Ask for an engagement letter defining scope, responsibilities, and deadlines.
What accountants cost
Typical national ranges: individual tax return $150–$450, monthly bookkeeping $200–$700, business return $500–$2,500+.
Cost guidance is a national reference range, not a quote — actual fees depend on return complexity, entity type, and the firm. Always request a written estimate.
Frequently asked questions
How many accountants are in Ontario?+
We list 52 accounting firms in Ontario, California that have a website and a public review record, 46 of which hold a 4.5★+ Google rating. 134 businesses in Ontario appear in the underlying public data.
How much does an accountant cost in Ontario?+
Fees vary by complexity and firm. As a national reference, an individual tax return typically runs $150–$450, monthly bookkeeping $200–$700, and a business return $500–$2,500+. Ask each firm for a written fee estimate.
Do I need a CPA or a bookkeeper?+
A bookkeeper records day-to-day transactions and reconciles accounts; a CPA is a state-licensed accountant who can also handle complex tax planning, audits, and represent you before the IRS. Many small businesses use a bookkeeper year-round and a CPA at tax time.
Are the ratings on this page real?+
Yes — ratings and review counts are aggregate figures from Google, attributed to Google, with a link to the firm's Google reviews. accounting8 does not host or write reviews.