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Accountants in Diamond Bar, CA — 11 Top-Rated Firms (2026)

We list 11 accounting firms in Diamond Bar, California that have a website and a public review record — 9 CPA firms, 1 tax preparer, and 1 financial planner. 7 hold a Google rating of 4.5★ or higher, and the average across the 11 rated firms here is 4.10★. They are sorted by Google rating and review count.

By service: CPAs & Accountants (9)

The highest-rated firm in Diamond Bar is Christopher G Carmona CPA, APC (5.0★, 24 reviews). 7 of 11 rated firms hold a 4.5★ or higher Google rating.

Showing 11 of 11 firms · sorted by Google rating
1.
Christopher G Carmona CPA, APC
★★★★★★★★★★5.0(24 Google reviews)✓ Verified on Google
Tax Preparation · 745 Panhandle Dr, Diamond Bar, CA 91765
Services: payroll, tax planning
(800) 227-2891WebsiteMore info
2.
PFS Global
★★★★★★★★★★5.0(10 Google reviews)✓ Verified on GoogleIRS PTIN
CPA Firm · 556 N Diamond Bar Blvd Unit 101, Diamond Bar, CA 91765
Services: bookkeeping
(909) 294-7372WebsiteMore info
3.
Parikh Mehta & Associates
★★★★★★★★★★5.0(4 Google reviews)✓ Verified on GoogleIRS PTIN
Accountant · 22632 Golden Springs Dr, Diamond Bar, CA 91765
Services: accounting
(909) 861-8100WebsiteMore info
4.
CPA & Insurance
★★★★★★★★★★4.8(111 Google reviews)✓ Verified on GoogleIRS PTIN
CPA Firm · 21343 Cold Spring Ln, Diamond Bar, CA 91765
Services: financial planning, advisory
(909) 479-9639WebsiteMore info
5.
Grace Tax Group
★★★★★★★★★★4.8(17 Google reviews)✓ Verified on Google
CPA Firm · 20955 Pathfinder Rd, Diamond Bar, CA 91765
Services: bookkeeping, payroll
(909) 843-6321WebsiteMore info
6.
Harry C. Lin, CPA A Professional Corporation 林清吉聯合會計師事務所
★★★★★★★★★★4.7(12 Google reviews)✓ Verified on GoogleIRS PTIN
CPA Firm · 888 S Brea Canyon Rd Ste 225, Diamond Bar, CA 91789
Services: audit & assurance
(626) 810-3403WebsiteMore info
7.
Frontier Tax Consulting, CPA | 藍海會計師事務所 (加州）
★★★★★★★★★★4.6(19 Google reviews)✓ Verified on GoogleIRS PTIN
CPA Firm · 1370 Valley Vista Dr Ste 210, Diamond Bar, CA 91765
Services: accounting & tax
(626) 699-9959WebsiteMore info
8.
Bharti Sudan, CPA Inc.
★★★★★★★★★★4.4(20 Google reviews)✓ Verified on GoogleIRS PTIN
CPA Firm · 23341 Golden Springs Dr Ste 204, Diamond Bar, CA 91765
Services: bookkeeping, tax preparation, audit & assurance
(909) 861-5642WebsiteMore info
9.
David Shin & Co., CPA
★★★★★★★★★★3.0(4 Google reviews)✓ Verified on GoogleIRS PTIN
Accountant · 22632 Golden Springs Dr Unit 105, Diamond Bar, CA 91765
Services: accounting
(909) 594-5052WebsiteMore info
10.
Bank of America (with Drive-thru ATM)
★★★★★★★★★★2.8(72 Google reviews)✓ Verified on Google
Financial Planning · 1196 S Diamond Bar Blvd, Diamond Bar, CA 91765
Services: advisory
(909) 396-8144WebsiteMore info
11.
CCZ Accounting, LLP
★★★★★★★★★★1.0(1 Google review)✓ Verified on GoogleIRS PTIN
CPA Firm · 20627 Golden Springs Dr Unit 1-C, Diamond Bar, CA 91789
Services: accounting & tax
(909) 598-8331WebsiteMore info

Top accounting firms in Diamond Bar

#FirmServiceGoogle ratingReviews
1Christopher G Carmona CPA, APCTax Preparation5.0 / 524
2PFS GlobalCPA Firm5.0 / 510
3Parikh Mehta & AssociatesAccountant5.0 / 54
4CPA & InsuranceCPA Firm4.8 / 5111
5Grace Tax GroupCPA Firm4.8 / 517

More Firms in Diamond Bar

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

How to choose an accountant in Diamond Bar

  • 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 Diamond Bar?
We list 11 accounting firms in Diamond Bar, California that have a website and a public review record, 7 of which hold a 4.5★+ Google rating. 78 businesses in Diamond Bar appear in the underlying public data.
How much does an accountant cost in Diamond Bar?
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.