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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; use the service links above to narrow the list.

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By service in Diamond Bar

🧮CPAs & Accountants9

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.

CG
Christopher G Carmona CPA, APC✓ Verified
Tax PreparationDiamond Bar, CA
Tax Preparation in Diamond Bar, California offering payroll, tax preparation, and tax planning. Rated 5.0★ across 24 Google reviews.
★5.0 (24)
☎↗
PG
PFS Global✓ VerifiedIRS PTIN
CPA FirmDiamond Bar, CA
CPA Firm in Diamond Bar, California offering bookkeeping. Rated 5.0★ across 10 Google reviews.
★5.0 (10)
☎↗
PM
Parikh Mehta & Associates✓ VerifiedIRS PTIN
AccountantDiamond Bar, CA
Accountant in Diamond Bar, California offering accounting.
★5.0 (4)
☎↗
CI
CPA & Insurance✓ VerifiedIRS PTIN
CPA FirmDiamond Bar, CA
CPA Firm in Diamond Bar, California offering financial planning, and advisory. Rated 4.8★ across 111 Google reviews.
★4.8 (111)
☎↗
GT
Grace Tax Group✓ Verified
CPA FirmDiamond Bar, CA
CPA Firm in Diamond Bar, California offering bookkeeping, and payroll. Rated 4.8★ across 17 Google reviews.
★4.8 (17)
☎↗
HC
Harry C. Lin, CPA A Professional Corporation 林清吉聯合會計師事務所✓ VerifiedIRS PTIN
CPA FirmDiamond Bar, CA
CPA Firm in Diamond Bar, California offering audit & assurance. Rated 4.7★ across 12 Google reviews.
★4.7 (12)
☎↗
FT
Frontier Tax Consulting, CPA | 藍海會計師事務所 (加州）✓ VerifiedIRS PTIN
CPA FirmDiamond Bar, CA
CPA Firm in Diamond Bar, California offering accounting & tax. Rated 4.6★ across 19 Google reviews.
★4.6 (19)
☎↗
BS
Bharti Sudan, CPA Inc.✓ VerifiedIRS PTIN
CPA FirmDiamond Bar, CA
CPA Firm in Diamond Bar, California offering bookkeeping, tax preparation, and audit & assurance. Rated 4.4★ across 20 Google reviews.
★4.4 (20)
☎↗
DS
David Shin & Co., CPA✓ VerifiedIRS PTIN
AccountantDiamond Bar, CA
Accountant in Diamond Bar, California offering accounting.
★3.0 (4)
☎↗
BO
Bank of America (with Drive-thru ATM)✓ Verified
Financial PlanningDiamond Bar, CA
Financial Planning in Diamond Bar, California offering financial planning, and advisory. Rated 2.8★ across 72 Google reviews.
★2.8 (72)
☎↗
CA
CCZ Accounting, LLP✓ VerifiedIRS PTIN
CPA FirmDiamond Bar, CA
CPA Firm in Diamond Bar, California offering accounting & tax.
★1.0 (1)
☎↗

Top accounting firms in Diamond Bar

#FirmServiceRatingReviews
1Christopher G Carmona CPA, APC✓Tax Preparation★ 5.024
2PFS Global✓CPA Firm★ 5.010
3Parikh Mehta & Associates✓Accountant★ 5.04
4CPA & Insurance✓CPA Firm★ 4.8111
5Grace Tax Group✓CPA Firm★ 4.817

More firms in Diamond Bar

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.

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.

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