Company lists · Data refreshed September 2026

Top 25 Accounting and tax outsourcing companies based in Irvine, United States

Name: Accounting and tax outsourcing companies based in Irvine, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 22, 2026 78 companies tracked

RevenueBase identified 78 accounting and tax outsourcing companies headquartered in Irvine, United States as of September 2026 and tracks 629 professional contacts across them, including 302 with verified work emails. New York is the largest hub.

This list covers accounting and tax outsourcing companies headquartered in Irvine, United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 22, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 22, 2026 86% judged on-target in blind review

78Companies

629Contacts tracked

302Verified emails

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The 25 largest accounting and tax outsourcing companies based in Irvine, United States

Ranked by team size

Top 25 of 78 accounting and tax outsourcing companies based in Irvine, United States, ranked by team size, largest first. Data refreshed Sep 22, 2026. RevenueBase Smart Search rates how each company's information relates to accounting and tax outsourcing companies: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Haskell & White LLP	Strong evidence	Irvine, CA, United StatesHQ checked Sep 22, 2026	51-200	133 contacts →
	Strong evidence “Haskell & White LLP is one of the largest independently owned accounting, auditing and tax consulting firms in Southern California, specializing in servicing public and private…” Source: RevenueBase Database · checked Sep 22, 2026
2	Omega Accounting Solutions	Strong evidence	Irvine, CA, United StatesHQ checked Sep 22, 2026	11-50	70 contacts →
	Strong evidence “Omega Accounting Solutions is a financial and tax advisory based in Irvine, California that empowers small and medium-sized businesses (SMBs) to make better-informed decisions.” Source: RevenueBase Database · checked Sep 22, 2026
3	RJI Cpas	Partial evidence	Irvine, CA, United StatesHQ checked Sep 22, 2026	51-200	59 contacts →
	Partial evidence “RJI CPAs is a full-service accounting and consulting firm based in Irvine, California.” Source: RevenueBase Database · checked Sep 22, 2026
4	Gelman Llp, Cpas & Business Advisors	Partial evidence	Irvine, CA, United StatesHQ checked Sep 22, 2026	11-50	40 contacts →
	Partial evidence “Gelman LLP, headquartered in Irvine, California, is a full-service accounting firm that responds to the financial and business needs of companies across all of Southern California.” Source: RevenueBase Database · checked Sep 22, 2026
5	White Nelson Diehl Evans LLP	Partial evidence	Irvine, CA, United StatesHQ checked Sep 22, 2026	51-200	21 contacts →
	Partial evidence “White Nelson Diehl Evans LLP is a full-service accounting firm that prides itself on delivering personal service while supporting your most demanding global needs.” Source: RevenueBase Database · checked Sep 22, 2026
6	Sagelight Accounting	Partial evidence	Irvine, CA, United StatesHQ checked Sep 22, 2026	11-50	21 contacts →
	Partial evidence “At Sagelight Accounting, we go beyond basic compliance.” Source: RevenueBase Database · checked Sep 22, 2026
7	Finch Accounting	Partial evidence	Irvine, CA, United StatesHQ checked Sep 22, 2026	11-50	15 contacts →
	Partial evidence “Finch is your one stop shop for all things accounting and finance.” Source: RevenueBase Database · checked Sep 22, 2026
8	TAX Resolution Plus	Strong evidence	Irvine, CA, United StatesHQ checked Sep 22, 2026	11-50	15 contacts →
	Strong evidence “Tax Resolution Plus has been providing clients with Tax Settlement, Audit representation, and accounting services throughout the nation.” Source: RevenueBase Database · checked Sep 22, 2026
9	Afps LLP	Strong evidence	Irvine, CA, United StatesHQ checked Sep 22, 2026	11-50	14 contacts →
	Strong evidence “AFPS LLP is an independently owned tax, accounting, and auditing consulting firm located in Irvine, California and is recognized throughout Orange County as a leading authority in…” Source: RevenueBase Database · checked Sep 22, 2026
10	Maxwell & Company Cpa's, INC	Indirect evidence	Irvine, CA, United StatesHQ checked Sep 22, 2026	51-200	11 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 22, 2026
11	Reiwa Accounting LLP れいわ米国公認会計士事務所	Partial evidence	Irvine, CA, United StatesHQ checked Sep 22, 2026	11-50	11 contacts →
	Partial evidence “Reiwa Accounting LLP is a company based out of 18200 Von Karman Ave #790, Irvine, California, United States.” Source: RevenueBase Database · checked Sep 22, 2026
12	Abregov Parrino, LLP	Partial evidence	Irvine, CA, United StatesHQ checked Sep 22, 2026	1-10	10 contacts →
	Partial evidence “Abregov Parrino, LLP is a full-service Certified Public Accounting and Business Advisory firm that specializes in helping individuals and privately held businesses by providing…” Source: RevenueBase Database · checked Sep 22, 2026
13	Soco TAX & Cloud Accounting Services	Strong evidence	Irvine, CA, United StatesHQ checked Sep 22, 2026	11-50	9 contacts →
	Strong evidence “SoCo Tax & Cloud Accounting provides small businesses and entrepreneurs with fast tools to mange their organization.” Source: RevenueBase Database · checked Sep 22, 2026
14	Basis 365 Accounting	Partial evidence	Irvine, CA, United StatesHQ checked Sep 22, 2026	11-50	9 contacts →
	Partial evidence “Basis 365® Accounting provides outsourced accounting, bookkeeping, and payroll services to ecommerce, tech, software and a wide range of professional service-based businesses.” Source: RevenueBase Database · checked Sep 22, 2026
15	Gonzalez CPA	Strong evidence	Irvine, CA, United StatesHQ checked Sep 22, 2026	11-50	9 contacts →
	Strong evidence “Founded in 2001 Gonzalez CPA is a fully certified public accounting firm which has been practicing accounting, tax strategies, and management consulting for 15 years.” Source: RevenueBase Database · checked Sep 22, 2026
16	Areté Advisors	Partial evidence	Irvine, CA, United StatesHQ checked Sep 22, 2026	11-50	9 contacts →
	Partial evidence “At Areté Advisors, we believe every client deserves expert financial guidance, not just at tax time, but throughout every stage of their business and personal financial journey.” Source: RevenueBase Database · checked Sep 22, 2026
17	Bright Giraffe Business Services	Indirect evidence	Irvine, CA, United StatesHQ checked Sep 22, 2026	1-10	8 contacts →
	Indirect evidence “We are a boutique bookkeeping firm that offers financial and business support services with extensive experience in the lead generation industry.” Source: RevenueBase Database · checked Sep 22, 2026
18	SRH Financial Consultants	Strong evidence	Irvine, CA, United StatesHQ checked Sep 22, 2026	1-10	8 contacts →
	Strong evidence “SRH Financial Consultants provides tax and accounting services in Orange County, CA.” Source: RevenueBase Database · checked Sep 22, 2026
19	NI TAX & Accounting	Strong evidence	Irvine, CA, United StatesHQ checked Sep 22, 2026	11-50	7 contacts →
	Strong evidence “NI TAX & ACCOUNTING is a full service accounting firm serving the Orange County at Southern California.” Source: RevenueBase Database · checked Sep 22, 2026
20	Plushstone Advisory, TAX & Accountancy	Partial evidence	Irvine, CA, United StatesHQ checked Sep 22, 2026	1-10	7 contacts →
	Partial evidence “PlushStone Advisory is a relationship focused CPA firm helping clients with bookkeeping, strategic tax planning, and financial advisory services to help businesses make educated…” Source: RevenueBase Database · checked Sep 22, 2026
21	Honest TAX Solutions	Strong evidence	Irvine, CA, United StatesHQ checked Sep 22, 2026	1-10	7 contacts →
	Strong evidence “Honest Tax Solutions is a reputable Tax and Accounting Firm located in Southern California.” Source: RevenueBase Database · checked Sep 22, 2026
22	KDM Business Consulting	Partial evidence	Irvine, CA, United StatesHQ checked Sep 22, 2026	1-10	6 contacts →
	Partial evidence “KDM is a certified public accounting firm based in Orange County, CA.” Source: RevenueBase Database · checked Sep 22, 2026
23	The Putmangroup	Strong evidence	Irvine, CA, United StatesHQ checked Sep 22, 2026	1-10	6 contacts →
	Strong evidence “The PUTMANGROUP is a full service CPA firm providing a Comprehensive Approach to meet your financial needs with accounting, tax, business consulting, and QuickBooks management.” Source: RevenueBase Database · checked Sep 22, 2026
24	Harris Greene LLP	Partial evidence	Irvine, CA, United StatesHQ checked Sep 22, 2026	11-50	5 contacts →
	Partial evidence “Harris Greene LLP is an accounting company based out of United States.” Source: RevenueBase Database · checked Sep 22, 2026
25	O'connor & YU LLP	Indirect evidence	Irvine, CA, United StatesHQ checked Sep 22, 2026	11-50	3 contacts →
	Indirect evidence “At O'Connor & Yu LLP, we pride ourselves on our dedication to the success and long term growth of our individual and business clients.” Source: RevenueBase Database · checked Sep 22, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: accounting and tax outsourcing companies. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names accounting and tax outsourcing companies.
Partial evidence: Its own public description names part of accounting and tax outsourcing companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name accounting and tax outsourcing companies. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 78 accounting and tax outsourcing companies based in Irvine, United States

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Accounting and tax outsourcing companies based in Irvine, United States at a glance

As of Sep 22, 2026

48.0%Verified-email coverage

8.1Average contacts per company

1-10Median size (employees)

580.8%Largest-city concentration · New York

Sep 22, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

Email recency for this list is measured across the whole United States list rather than for Irvine, so it is reported there. Company counts and contact totals on this page are exact for Irvine, over 78 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among accounting and tax outsourcing companies, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in Irvine, United States whose own description of what they do matches “accounting and tax outsourcing companies”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names accounting and tax outsourcing companies), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among accounting and tax outsourcing companies, and records with no verified work email. Companies headquartered outside Irvine are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every listed company carries at least one verified work email, 302 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 22, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Accounting and tax outsourcing companies by metro in the United States

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names accounting and tax outsourcing companies, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many accounting and tax outsourcing companies are there based in Irvine, United States?

RevenueBase identified 78 accounting and tax outsourcing companies headquartered in Irvine, United States as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Haskell & White LLP, headquartered in Irvine, tops this list with the largest team on record.

Which city has the most accounting and tax outsourcing companies?

New York leads with 453 headquartered companies, followed by Houston (321) and Miami (222).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 302 verified decision-maker contacts tracked across these 78 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 22, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.