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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.

By service: CPAs & Accountants (15)|Tax Preparers (26)|Financial Planners (8)

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.

Showing 50 of 52 firms · sorted by Google rating
1.
ACE Cash Express
★★★★★★★★★★5.0(506 Google reviews)✓ Verified on Google
Tax Preparation · 1856 S Euclid Ave B, Ontario, CA 91762
(909) 418-6981WebsiteMore info
2.
Madero Accountancy Practice, PC
★★★★★★★★★★5.0(47 Google reviews)✓ Verified on GoogleIRS PTIN
Tax Preparation · 4055 E Hamilton Paseo, Ontario, CA 91761
(909) 375-1250WebsiteMore info
3.
Cifuentes & Associates Ltd. Liability Co.
★★★★★★★★★★5.0(41 Google reviews)✓ Verified on Google
CPA Firm · 3400 Inland Empire Blvd #101, Ontario, CA 91764
Services: bookkeeping, tax preparation
(909) 324-4464WebsiteMore info
4.
Bollman Consulting
★★★★★★★★★★5.0(30 Google reviews)✓ Verified on Google
Accountant · 3281 E Guasti Rd 7th Floor, Ontario, CA 91761
Services: accounting
(909) 231-8799WebsiteMore info
5.
Integrity Financial & Insurance Services
★★★★★★★★★★5.0(30 Google reviews)✓ Verified on Google
Financial Planning · 3633 Inland Empire Blvd Suite 860, Ontario, CA 91764
(909) 599-2800WebsiteMore info
6.
ROARK | CFO & Controllers | Executive Search | Project Consultants
★★★★★★★★★★5.0(25 Google reviews)✓ Verified on Google
CPA Firm · 3200 E Guasti Rd #100, Ontario, CA 91761
Services: advisory
(909) 677-2200WebsiteMore info
7.
Meza CPAs, Tax & Accounting
★★★★★★★★★★5.0(23 Google reviews)✓ Verified on GoogleIRS PTIN
CPA Firm · 3350 Shelby St #200, Ontario, CA 91764
Services: bookkeeping, tax planning, advisory
(909) 279-0009WebsiteMore info
8.
Jewels Taxes and Bookkeeping
★★★★★★★★★★5.0(12 Google reviews)✓ Verified on Google
Bookkeeping · 1945 E Riverside Dr #20, Ontario, CA 91761
Services: tax preparation, advisory
(909) 773-1863WebsiteMore info
9.
Monumental Insurance
★★★★★★★★★★5.0(12 Google reviews)✓ Verified on Google
Tax Preparation · 1945 E Riverside Dr #4, Ontario, CA 91761
(909) 947-9666WebsiteMore info
10.
EAGLE TAX & NOTARY PUBLIC SERVICES
★★★★★★★★★★5.0(10 Google reviews)✓ Verified on Google
Bookkeeping · 615 N Euclid Ave Ste 102, Ontario, CA 91762
Services: tax preparation, advisory
(909) 467-0702WebsiteMore info
11.
RFS Accounting and Taxes
★★★★★★★★★★5.0(10 Google reviews)✓ Verified on Google
Tax Preparation · 980 W 6th St Ste 107, Ontario, CA 91762
Services: tax planning, advisory
(909) 731-4810WebsiteMore info
12.
Corellia Finance & Tax
★★★★★★★★★★5.0(9 Google reviews)
Tax Preparation · 2990 Inland Empire Blvd #114, Ontario, CA 91764
(909) 621-9718WebsiteMore info
13.
SB CPA INC
★★★★★★★★★★5.0(9 Google reviews)✓ Verified on Google
CPA Firm · 4345 E Lowell St STE G, Ontario, CA 91761
Services: accounting & tax
(866) 256-8167WebsiteMore info
14.
Wealth Integrity Partners
★★★★★★★★★★5.0(8 Google reviews)✓ Verified on Google
Financial Planning · 3281 E Guasti Rd Ste 700, Ontario, CA 91761
(909) 443-3802WebsiteMore info
15.
One Stop Tax Services
★★★★★★★★★★5.0(7 Google reviews)✓ Verified on Google
Tax Preparation · 2990 Inland Empire Blvd, Ontario, CA 91764
(909) 451-3026WebsiteMore info
16.
We Care Tax LLC
★★★★★★★★★★5.0(7 Google reviews)✓ Verified on Google
Bookkeeping · 3281 E Guasti Rd STE 732, Ontario, CA 91761
Services: payroll, tax preparation
(909) 962-9578WebsiteMore info
17.
Stone Creek Tax Relief
★★★★★★★★★★5.0(5 Google reviews)✓ Verified on Google
Tax Preparation · 3200 E Guasti Rd Ste 100, Ontario, CA 91761
(310) 598-5071WebsiteMore info
18.
Eide Bailly
★★★★★★★★★★5.0(1 Google review)✓ Verified on GoogleIRS PTIN
CPA Firm · 901 Via Piemonte #450, Ontario, CA 91764
Services: audit & assurance, advisory
(909) 466-4410WebsiteMore info
19.
GYL CPAs and Advisors
★★★★★★★★★★5.0(1 Google review)✓ Verified on GoogleIRS PTIN
CPA Firm · 4120 Concours St #100, Ontario, CA 91764
Services: tax planning, advisory
(909) 948-9990WebsiteMore info
20.
Pangan Benjamin A CPA
★★★★★★★★★★5.0(1 Google review)✓ Verified on GoogleIRS PTIN
CPA Firm · 3100 E Cedar St STE 12, Ontario, CA 91761
Services: accounting & tax
(909) 732-4783WebsiteMore info
21.
Raul Marquez, CPA Accounting Office
★★★★★★★★★★5.0(1 Google review)✓ Verified on GoogleIRS PTIN
CPA Firm · 525 W Holt Blvd, Ontario, CA 91762
Services: accounting & tax
(909) 271-8026WebsiteMore info
22.
Fiesta Auto Insurance & Tax Service
★★★★★★★★★★4.9(497 Google reviews)✓ Verified on Google
Tax Preparation · 2213 S Mountain Ave, Ontario, CA 91762
(909) 458-0432WebsiteMore info
23.
Falcon Wealth Planning
★★★★★★★★★★4.9(287 Google reviews)✓ Verified on Google
Financial Planning · 3400 Inland Empire Blvd Ste 100, Ontario, CA 91764
(855) 963-2526WebsiteMore info
24.
RCS Tax Group
★★★★★★★★★★4.9(198 Google reviews)✓ Verified on Google
Tax Preparation · 3200 E Guasti Rd Ste 100 Unit 7, Ontario, CA 91761
(626) 413-3204WebsiteMore info
25.
Fernandez Income Tax
★★★★★★★★★★4.9(175 Google reviews)✓ Verified on Google
Tax Preparation · 115 W B St, Ontario, CA 91762
Services: tax planning, advisory
(909) 391-6737WebsiteMore info
26.
H&R Block
★★★★★★★★★★4.9(79 Google reviews)✓ Verified on Google
CPA Firm · 120 S San Antonio Ave B, Ontario, CA 91762
Services: tax preparation, tax planning, advisory
(909) 983-8033WebsiteMore info
27.
Tax365
★★★★★★★★★★4.9(73 Google reviews)✓ Verified on Google
Tax Preparation · 720 N Archibald Ave c, Ontario, CA 91764
Services: tax planning, advisory
(909) 975-2775WebsiteMore info
28.
MILES Financial Group
★★★★★★★★★★4.9(54 Google reviews)✓ Verified on Google
Financial Planning · 3633 Inland Empire Blvd Ste 650, Ontario, CA 91764
(909) 458-0418WebsiteMore info
29.
Hongda Tax and Accounting Services
★★★★★★★★★★4.9(29 Google reviews)✓ Verified on Google
CPA Firm · 2920 Inland Empire Blvd #105, Ontario, CA 91764
Services: tax preparation
(951) 880-3938WebsiteMore info
30.
TurboTax - Guasti, Ontario
★★★★★★★★★★4.9(22 Google reviews)✓ Verified on Google
Tax Preparation · 3350 Shelby St Office 227 / 228, Ontario, CA 91764
Services: tax planning, advisory
(310) 651-5357WebsiteMore info
31.
PB Financial Group Corporation - Ontario Office
★★★★★★★★★★4.9(14 Google reviews)
Financial Planning · 3281 E Guasti Rd Suite #700, Ontario, CA 91761
Services: advisory
(909) 457-0003WebsiteMore info
32.
ACE Cash Express
★★★★★★★★★★4.8(415 Google reviews)✓ Verified on Google
Tax Preparation · 658 W Holt Blvd C, Ontario, CA 91762
(909) 460-6262WebsiteMore info
33.
Jackson Hewitt Tax Service
★★★★★★★★★★4.8(126 Google reviews)✓ Verified on Google
Tax Preparation · 1333 N Mountain Ave, Ontario, CA 91762
Services: tax planning, advisory
(951) 324-5818WebsiteMore info
34.
H&R Block
★★★★★★★★★★4.8(83 Google reviews)✓ Verified on Google
CPA Firm · 2503 S Euclid Ave Unit E, Ontario, CA 91761
Services: tax preparation, tax planning, advisory
(909) 988-9333WebsiteMore info
35.
H&R Block
★★★★★★★★★★4.8(78 Google reviews)✓ Verified on Google
CPA Firm · 960 N Mountain Ave, Ontario, CA 91762
Services: tax preparation, tax planning, advisory
(909) 983-8337WebsiteMore info
36.
Xel Advisors, CPA
★★★★★★★★★★4.8(43 Google reviews)✓ Verified on Google
CPA Firm · 337 N Vineyard Ave #230, Ontario, CA 91764
Services: accounting & tax
(909) 750-0462WebsiteMore info
37.
NARDOS BUSINESS SERVICES LLC
★★★★★★★★★★4.8(25 Google reviews)✓ Verified on Google
Tax Preparation · 1128 W Mission Blvd F, Ontario, CA 91762
(909) 391-0077WebsiteMore info
38.
1st CHOICE TAX PREPARATION
★★★★★★★★★★4.8(23 Google reviews)✓ Verified on Google
Tax Preparation · 700 N Mountain Ave #101, Ontario, CA 91762
(909) 983-8600WebsiteMore info
39.
Reyes Bookkeeping & Income Tax
★★★★★★★★★★4.8(15 Google reviews)✓ Verified on Google
Tax Preparation · 931 W Holt Blvd Suite C, Ontario, CA 91762
Services: payroll
(909) 984-0217WebsiteMore info
40.
Pierpont Investment Group
★★★★★★★★★★4.8(5 Google reviews)✓ Verified on Google
Financial Planning · 3200 E Guasti Rd Ste 100, Ontario, CA 91761
(909) 456-8891WebsiteMore info
41.
Liberty Tax
★★★★★★★★★★4.7(125 Google reviews)✓ Verified on Google
Tax Preparation · 870 S Mountain Ave, Ontario, CA 91762
Services: tax planning, advisory
(909) 724-4019WebsiteMore info
42.
Aida Real Professional Services
★★★★★★★★★★4.7(108 Google reviews)✓ Verified on Google
Tax Preparation · 561 W Holt Blvd Ste B, Ontario, CA 91762
(909) 391-7131WebsiteMore info
43.
H&R Block
★★★★★★★★★★4.7(76 Google reviews)✓ Verified on Google
CPA Firm · 1831 E 4th St, Ontario, CA 91764
Services: tax preparation, tax planning, advisory
(909) 983-8089WebsiteMore info
44.
Mi Oficina Income Tax & Insurance
★★★★★★★★★★4.6(52 Google reviews)✓ Verified on Google
Tax Preparation · 1245 N Grove Ave a, Ontario, CA 91764
(909) 984-4900WebsiteMore info
45.
Americanas Travel & Multiservices, Inc.
★★★★★★★★★★4.5(17 Google reviews)✓ Verified on Google
Tax Preparation · 209 W Francis St, Ontario, CA 91762
(909) 460-0078WebsiteMore info
46.
Barbara Robertson & Associates
★★★★★★★★★★4.5(6 Google reviews)
Tax Preparation · 2990 Inland Empire Blvd #107, Ontario, CA 91764
(909) 466-7466WebsiteMore info
47.
Enriquez Income Tax
★★★★★★★★★★4.4(57 Google reviews)✓ Verified on Google
Tax Preparation · 610 E Francis St Unit 180, Ontario, CA 91761
(909) 460-0659WebsiteMore info
48.
Moreno's Income Tax Services
★★★★★★★★★★4.4(33 Google reviews)✓ Verified on Google
Tax Preparation · 939 W Mission Blvd C, Ontario, CA 91762
(909) 549-3888WebsiteMore info
49.
Panamericana Income Tax - Ontario
★★★★★★★★★★3.3(13 Google reviews)✓ Verified on Google
Tax Preparation · 755 E Holt Blvd B, Ontario, CA 91761
(909) 740-8510WebsiteMore info
50.
Bank of America (with Drive-thru ATM)
★★★★★★★★★★2.0(116 Google reviews)✓ Verified on Google
Financial Planning · 735 N Euclid Ave, Ontario, CA 91762
Services: advisory
(909) 460-5545WebsiteMore info

Top accounting firms in Ontario

#FirmServiceGoogle ratingReviews
1ACE Cash ExpressTax Preparation5.0 / 5506
2Madero Accountancy Practice, PCTax Preparation5.0 / 547
3Cifuentes & Associates Ltd. Liability Co.CPA Firm5.0 / 541
4Bollman ConsultingAccountant5.0 / 530
5Integrity Financial & Insurance ServicesFinancial Planning5.0 / 530

More Firms in Ontario

Firms without a website or enough reviews for a profile page of their own.

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.

How to verify a CPA license »

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.