Combined HCM
“We couldn't be more grateful for his help and would recommend Jack without hesitation to anyone in need of life insurance or any insurance assistance.”
Best Payroll Services in Diamond Bar, CA
15 companies listed · 6 in Diamond Bar · 2 open weekends · 13 rated 4.5+ · 2 show a license
Data verified October 18, 2026
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Christopher G Carmona CPA
“He is very responsive and quick to help you out with any questions about filing and have now used him for several years.”
Harry C. Lin, CPA A Professional Corporation 林清吉聯合會計師事務所
“Good help for my taxes and accounting.”
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Mooneem
“Highly recommend to speak with them before hiring anybody”
PFS Global
“This allowed me to trust them with my family HVAC business and now I won't deal with anyone else.”
Mead, Coley and Company Cpa's
“We have been using them for our business for many years and they are professional and knowledgeable.”
The 15 companies listed for Diamond Bar, CA run payroll, filings and timekeeping for employers. Service and software details are taken from each provider's own website; ratings and quotes come from public reviews.
Area overview: Diamond Bar, CA
6 of the 15 companies we list are based in Diamond Bar; the other 9 serve Diamond Bar from towns including Pomona (5 mi), Covina (7 mi) and Upland (12 mi). The companies on this page are rated from 4.1 to 5.0 across 590 reviews; 4 have 50 or more reviews and 13 are rated 4.5 or higher. The topics that come up most in reviews of the companies on this page are "expertise" and "knowledge". 2 are open on Saturdays. The services the companies on this page list most often on their websites are payroll services (4), accounting services (3) and tax services (3). 2 show a license on their websites and 2 have a BBB rating of A or A+. 12 have ten or more years of experience, the longest 43 years. 1 offers remote or virtual consultations; 3 offer a free initial consultation and 2 are family- or locally-owned. We have a website on file for all 15 of the companies on this page; 12 publish a contact page; 10 list a public email and 3 take bookings online. We count these figures across the companies on this page; distances are straight-line, and hours and prices change, so confirm the details with the company before you book a consultation.
Why are payroll companies outside Diamond Bar on this page?
An office in Diamond Bar is held by 6 of the 15 companies. The rest come from other towns within 15 mi. Payroll is run remotely, so the filing jurisdictions a provider covers matter far more than the address. Distances are straight-line.
A & A Employer Services
“They have also been very instrumental in supporting our growth out of state and dealing with different payroll regulations in each of those states.”
Southland Data Processing, an Mpay Company
“Giving a shoutout to Steve Mann, he was honest, transparent and educated me on everything that SDP had to offer my company.”
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Diamonds Tax
“Been my tax lady for over 5 years and she is amazing!!”
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Zamora Tax & Immigration
“They are the best , never make you way very profesional 😀 …”
Elite Accountants Group
“Tax extension deadline was approaching and I had called several Tax offices without much success, but when I called Elite Accountants Group, Ahmad answered and an appointmen was made.”
Epay Payroll
“They have a team knowledgeable in almost everything my business needs from lawyers, to accountants and payroll specialists.”
Lopez
“Funny guy && makes taxes seem less scary 🙌 …”
Lou's
“We love Lou's Income Tax for the total peace of mind we feel all year long knowing that our taxes are done properly.”
Chilson Business & Tax Services
“I have been a customer of Chilson Business for about 10 years and recommend them to anyone looking for tax services.”
Why these companies made our list
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