Company lists · Data refreshed September 2026

Top 25 Accounting compliance outsourcing companies based in the United Kingdom

Name: Accounting compliance outsourcing companies based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 27, 2026 843 companies tracked

RevenueBase identified 843 accounting compliance outsourcing companies headquartered in the United Kingdom as of September 2026 and tracks 4,887 professional contacts across them, including 1,284 with verified work emails. London is the largest hub.

This list covers accounting compliance outsourcing companies headquartered in the United Kingdom, 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 27, 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 27, 2026 86% judged on-target in blind review

843Companies

4,887Contacts tracked

1,284Verified emails

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The 25 largest accounting compliance outsourcing companies based in the United Kingdom

Ranked by team size

Top 25 of 843 accounting compliance outsourcing companies based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 27, 2026. RevenueBase Smart Search rates how each company's information relates to accounting compliance 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	Outbooks	Strong evidence	Harrow, United KingdomHQ checked Sep 27, 2026	201-500	477 contacts →
	Strong evidence “Outbooks is a leading provider of outsourcing services to accounting and bookkeeping firms.” Source: RevenueBase Database · checked Sep 27, 2026
2	GI Outsourcing	Partial evidence	London, United KingdomHQ checked Sep 27, 2026	201-500	311 contacts →
	Partial evidence “GI Outsourcing is a UK-based accountants outsourcing firm.” Source: RevenueBase Database · checked Sep 27, 2026
3	HSJ Accountants, Business & TAX Advisors	Indirect evidence	Newport, United KingdomHQ checked Sep 27, 2026	51-200	134 contacts →
	Indirect evidence “Award winning accountants & tax advisors based in Newport, South Wales.” Source: RevenueBase Database · checked Sep 27, 2026
4	Initor Global UK	Indirect evidence	London, United KingdomHQ checked Sep 27, 2026	51-200	108 contacts →
	Indirect evidence “As attention turns to the new fiscal year, accountants across the UK are finalising plans to boost growth and productivity and improve profitability.” Source: RevenueBase Database · checked Sep 27, 2026
5	SJD Accountancy	Indirect evidence	Hemel Hempstead, United KingdomHQ checked Sep 27, 2026	501-1,000	102 contacts →
	Indirect evidence “SJD is now Caroola Accountancy!” Source: RevenueBase Database · checked Sep 27, 2026
6	Rayner Essex LLP	Indirect evidence	St Albans, United KingdomHQ checked Sep 27, 2026	51-200	98 contacts →
	Indirect evidence “At Rayner Essex, we believe your accountant should do a lot more than just report on how your business is doing - he or she should help you identify opportunities to improve your…” Source: RevenueBase Database · checked Sep 27, 2026
7	Affinity Outsourcing Limited	Strong evidence	Wembley, United KingdomHQ checked Sep 27, 2026	51-200	96 contacts →
	Strong evidence “Affinity Outsourcing is an accountancy outsourcing company that specialises in outsourcing for Accounting Practices.” Source: RevenueBase Database · checked Sep 27, 2026
8	Sapphire Info Solutions P LTD	Strong evidence	London, United KingdomHQ checked Sep 27, 2026	51-200	88 contacts →
	Strong evidence “Sapphire is an accounting outsourcing company set up for accounting firms in UK and is based in India.” Source: RevenueBase Database · checked Sep 27, 2026
9	Nordens Chartered Accountants	Indirect evidence	Woodford Green, United KingdomHQ checked Sep 27, 2026	51-200	65 contacts →
	Indirect evidence “At Nordens, we get it - we really do.” Source: RevenueBase Database · checked Sep 27, 2026
10	Affinity Associates Limited	Partial evidence	Wembley, United KingdomHQ checked Sep 27, 2026	201-500	64 contacts →
	Partial evidence “Affinity Associates Limited is a leading accounting firm based in Wembley, London, UK, and is regulated and authorised for public practice by both the ICAEW (Institute of…” Source: RevenueBase Database · checked Sep 27, 2026
11	Cashroom	Partial evidence	Livingston, United KingdomHQ checked Sep 27, 2026	51-200	58 contacts →
	Partial evidence “Legal Cashiering Services Payroll Services Management Accounting Statutory Accounts Credit Control Consultancy Projects The Cashroom understands that you just want to get on with…” Source: RevenueBase Database · checked Sep 27, 2026
12	Stellaripe	Indirect evidence	London, United KingdomHQ checked Sep 27, 2026	51-200	58 contacts →
	Indirect evidence “We are on a mission to help accountants to grow their accountancy practice and become more profitable.” Source: RevenueBase Database · checked Sep 27, 2026
13	Acenteus Accounting	Partial evidence	Plus X Innovation, United KingdomHQ checked Sep 27, 2026	51-200	56 contacts →
	Partial evidence “Acenteus Accounting, legally known as Acenteus CCA Global Ltd is a UK-registered outsourced accounting and finance partner delivering secure, cloud-enabled support for…” Source: RevenueBase Database · checked Sep 27, 2026
14	DSL Accounting	Indirect evidence	Leamington Spa, United KingdomHQ checked Sep 27, 2026	n/a	54 contacts →
	Indirect evidence “DSL is one of the UK's leading small business accountancy firms, helping businesses grow since 1997.” Source: RevenueBase Database · checked Sep 27, 2026
15	Glazers Chartered Accountants	Indirect evidence	London, United KingdomHQ checked Sep 27, 2026	11-50	39 contacts →
	Indirect evidence “Glazers is a well-established and progressive firm of accountants based in North West London.” Source: RevenueBase Database · checked Sep 27, 2026
16	Accounts ETC	Indirect evidence	Cirencester, United KingdomHQ checked Sep 27, 2026	1-10	30 contacts →
	Indirect evidence “We found that there was often a breakdown in service between your bookkeeper and your accountant and that more often than not the accountant was spending a majority of their time…” Source: RevenueBase Database · checked Sep 27, 2026
17	GLX	Indirect evidence	Norwich, United KingdomHQ checked Sep 27, 2026	11-50	28 contacts →
	Indirect evidence “GLX is an independent firm of chartered accountants based in East Anglia, servicing clients throughout the country.” Source: RevenueBase Database · checked Sep 27, 2026
18	M.Tatar & Associates	Indirect evidence	London, United KingdomHQ checked Sep 27, 2026	11-50	27 contacts →
	Indirect evidence “Chartered Accountants, Tax Advisors and Statutory Auditor based in London.” Source: RevenueBase Database · checked Sep 27, 2026
19	Propact Solutions	Partial evidence	Birmingham, United KingdomHQ checked Sep 27, 2026	11-50	22 contacts →
	Partial evidence “If you run an accountancy or bookkeeping firm, we can help you overcome your staff recruitment and retention challenges with our outsourcing and offshoring solutions that are…” Source: RevenueBase Database · checked Sep 27, 2026
20	Doshi Outsourcing	Indirect evidence	Croydon, United KingdomHQ checked Sep 27, 2026	201-500	20 contacts →
	Indirect evidence “In 1995 the Doshi family set up Doshi & Co in London as an accountancy practice for UK clients and simply offshored their very own back office in Gujarat, India in - a location…” Source: RevenueBase Database · checked Sep 27, 2026
21	Broadwing Accountancy Services Limited	Partial evidence	Northampton, United KingdomHQ checked Sep 27, 2026	1-10	17 contacts →
	Partial evidence “Broadwing Accountancy is a Northampton based firm of chartered accountants and business advisors, specialising in Outsourced Accounting, Personal & Corporation Tax, and Specialist…” Source: RevenueBase Database · checked Sep 27, 2026
22	Boobooks	Partial evidence	London, United KingdomHQ checked Sep 27, 2026	11-50	17 contacts →
	Partial evidence “Boobooks offers expert accounting, tax, and business support services tailored for small businesses.” Source: RevenueBase Database · checked Sep 27, 2026
23	E-Accountants Limited	Indirect evidence	Richmond, United KingdomHQ checked Sep 27, 2026	1-10	17 contacts →
	Indirect evidence “We give you beautiful figures and help you achieve your financial goals.” Source: RevenueBase Database · checked Sep 27, 2026
24	PKB Accountants	Partial evidence	Crowthorne, United KingdomHQ checked Sep 27, 2026	11-50	16 contacts →
	Partial evidence “At PKB, our chartered certified accountants, auditors and advisors provide compliance and consultancy services to businesses and individuals from offices in Crowthorne, Berkshire…” Source: RevenueBase Database · checked Sep 27, 2026
25	Hewitt Card Chartered Certified Accountants	Indirect evidence	Mansfield, United KingdomHQ checked Sep 27, 2026	11-50	16 contacts →
	Indirect evidence “We want to improve your business and help in areas that you probably didn't expect from accountants.” Source: RevenueBase Database · checked Sep 27, 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 compliance 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 compliance outsourcing companies.
Partial evidence: Its own public description names part of accounting compliance 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 compliance 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 843 accounting compliance outsourcing companies based in the United Kingdom

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Accounting compliance outsourcing companies based in the United Kingdom at a glance

As of Sep 27, 2026

26.3%Verified-email coverage

5.8Average contacts per company

1-10Median size (employees)

24.6%Largest-city concentration · London

Sep 27, 2026Page data refreshed

Companies by employee count

1-10

615

11-50

162

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

Email recency for this list is measured worldwide rather than for United Kingdom, so it is reported there. Company counts and contact totals on this page are exact for United Kingdom, over 843 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 compliance 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 the United Kingdom whose own description of what they do matches “accounting compliance 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 compliance 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 compliance outsourcing companies, and records with no verified work email. Companies headquartered outside United Kingdom 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, 1,284 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 27, 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 compliance outsourcing companies by metro

Accounting compliance outsourcing companies in London207

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 compliance 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 compliance outsourcing companies are there based in the United Kingdom?

RevenueBase identified 843 accounting compliance outsourcing companies headquartered in the United Kingdom 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?

Outbooks, headquartered in London, tops this list with the largest team on record.

Which city has the most accounting compliance outsourcing companies?

London leads with 207 headquartered companies, followed by Manchester (22) and Birmingham (17).

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 1,284 verified decision-maker contacts tracked across these 843 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 27, 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.