Company lists · Data refreshed September 2026

Top 25 Outsourcing bookkeeping services based in the United Kingdom

Name: Outsourcing bookkeeping services based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 1,891 companies tracked

RevenueBase identified 1,891 company matches for outsourcing bookkeeping services associated with the United Kingdom as of September 2026 and tracks 7,442 professional contacts across them, including 1,879 with verified work emails. London is the largest hub.

This list covers company matches for outsourcing bookkeeping services associated with the United Kingdom, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed September 21, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 RevenueBase SmartSearch · Exact Recorded Sep 21, 2026 How this list was built

1,891Companies

7,442Contacts tracked

1,879Verified emails

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The 25 largest outsourcing bookkeeping services based in the United Kingdom

Ranked by team size

Top 25 of 1,891 company matches for outsourcing bookkeeping services based in the United Kingdom, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 21, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	Outbooks	Exact match	Harrow, United KingdomHQ recorded Sep 21, 2026	201-500	477 contacts →
	Exact match “Outbooks is a leading provider of outsourcing services to accounting and bookkeeping firms.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
2	Corient Business Solutions Limited	Exact match	Coventry, United KingdomHQ recorded Sep 21, 2026	501-1,000	423 contacts →
	Exact match “Corient is a specialist outsourced accounting and bookkeeping partner, built exclusively for UK accountancy practices.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
3	Initor Global UK	Exact match	London, United KingdomHQ recorded Sep 21, 2026	51-200	108 contacts →
	Exact match “As attention turns to the new fiscal year, accountants across the UK are finalising plans to boost growth and productivity and improve profitability.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
4	Debitam	Exact match	42-44 Bishopsgate, United KingdomHQ recorded Sep 21, 2026	51-200	104 contacts →
	Exact match “Online Accounting Service \| Bookkeeping \| Payroll \| Personal Tax Return Filing to HMRC \| Corporation Tax Filing \| HMRC ONLINE FILING: Our aim is to help small business owners` tax…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
5	Affinity Outsourcing Limited	Exact match	Wembley, United KingdomHQ recorded Sep 21, 2026	51-200	96 contacts →
	Exact match “Affinity Outsourcing is an accountancy outsourcing company that specialises in outsourcing for Accounting Practices.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
6	Sapphire Info Solutions P LTD	Exact match	London, United KingdomHQ recorded Sep 21, 2026	51-200	88 contacts →
	Exact match “Sapphire is an accounting outsourcing company set up for accounting firms in UK and is based in India.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
7	Affinity Associates Limited	Exact match	Wembley, United KingdomHQ recorded Sep 21, 2026	201-500	64 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
8	Acenteus Accounting	Exact match	Plus X Innovation, United KingdomHQ recorded Sep 21, 2026	51-200	56 contacts →
	Exact match “Acenteus Accounting, legally known as Acenteus CCA Global Ltd is a UK-registered outsourced accounting and finance partner delivering secure, cloud-enabled support for…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
9	DSL Accounting	Exact match	Leamington Spa, United KingdomHQ recorded Sep 21, 2026	n/a	54 contacts →
	Exact match “DSL is one of the UK's leading small business accountancy firms, helping businesses grow since 1997.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
10	Artifin Accountants	Exact match	London, United KingdomHQ recorded Sep 21, 2026	11-50	53 contacts →
	Exact match “At Artifin Accountants we strive to provide a more open experience of accounting services for business owners.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
11	Green & Purple	Exact match	Cambridge, United KingdomHQ recorded Sep 21, 2026	51-200	44 contacts →
	Exact match “We offer a CFO-led virtual finance team.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
12	PSB Accountants Limited	Exact match	London, United KingdomHQ recorded Sep 21, 2026	11-50	42 contacts →
	Exact match “At PSB Accountants, we put your goals and aspirations first.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
13	Glazers Chartered Accountants	Exact match	London, United KingdomHQ recorded Sep 21, 2026	11-50	39 contacts →
	Exact match “Glazers is a well-established and progressive firm of accountants based in North West London.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
14	Pennybooks Limited	Exact match	London, United KingdomHQ recorded Sep 21, 2026	11-50	35 contacts →
	Exact match “We’re PennyBooks, a refreshingly modern, London based accounting firm, supporting a broad range of clients from single director freelancers through to scale up VC backed…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
15	Jump Accounting	Exact match	London, United KingdomHQ recorded Sep 21, 2026	51-200	35 contacts →
	Exact match “Accounting for Startups.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
16	Complete Accounting Solutions	Exact match	London, United KingdomHQ recorded Sep 21, 2026	11-50	33 contacts →
	Exact match “Complete Accounting Solutions is a firm of dedicated individuals focussed on providing small and growing companies with support on the accounts and bookkeeping activities of their…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
17	Accounts ETC	Exact match	Cirencester, United KingdomHQ recorded Sep 21, 2026	1-10	30 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
18	Bookcheck LTD	Exact match	London, United KingdomHQ recorded Sep 21, 2026	51-200	29 contacts →
	Exact match “Our clients rely on us to remove book-keeping hassle and improve their profitability by using our top quality financial reports based on professionally reconciled book-keeping.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
19	accountables.com	Exact match	Glasgow City, United KingdomHQ recorded Sep 21, 2026	11-50	29 contacts →
	Exact match “At Accountables, we manage the finance function for growing businesses across the US and UK, helping founders and CEOs make informed decisions with real-time financial insights.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
20	Finex Accounting	Exact match	Manchester, United KingdomHQ recorded Sep 21, 2026	51-200	29 contacts →
	Exact match “Finex Accounting is an outsourcing accountancy service provider.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
21	Clever Accounts LTD	Exact match	Leeds, United KingdomHQ recorded Sep 21, 2026	11-50	27 contacts →
	Exact match “More and more services have moved to an online or digital environment, as the easiest and best way of accessing them, allowing individuals and businesses greater control over…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
22	Propact Solutions	Exact match	Birmingham, United KingdomHQ recorded Sep 21, 2026	11-50	22 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
23	Affotax	Exact match	London, United KingdomHQ recorded Sep 21, 2026	11-50	22 contacts →
	Exact match “Simplified Online Accounting \| Customized Bookkeeping \| Expert Payroll Services Making Finances Easier: Welcome to AffoTax.com, where we're changing how small businesses handle…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
24	Accnet Solutions LTD	Exact match	London, United KingdomHQ recorded Sep 21, 2026	11-50	21 contacts →
	Exact match “AccNet Solutions was formed in November 2010 by Damitha Ukuwela as a firm providing accounting and bookkeeping solutions.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
25	PSF Accounting	Exact match	Cambridge, United KingdomHQ recorded Sep 21, 2026	1-10	21 contacts →
	Exact match “We are a small accountancy firm with offices in Cambridge and Stamford.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “outsourcing bookkeeping services”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 25 of 1,891 outsourcing bookkeeping services based in the United Kingdom

See the full list, filter by size, metro and specialty, and access 1,879 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Outsourcing bookkeeping services based in the United Kingdom at a glance

As of Sep 21, 2026

25.2%Verified-email coverage

3.9Average contacts per company

1-10Median size (employees)

17.6%Largest-city concentration · London

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

1,614

11-50

214

51-200

201-500

501-1,000

1,001-5,000

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 1,891 companies.

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies: Company records associated with the United Kingdom whose business descriptions match “outsourcing bookkeeping services” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch: Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview: The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality: RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 1,879 professional contacts with verified work emails across the full matched dataset. 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 21, 2026. Lists refresh periodically as the graph is re-checked.
Record context: Company records and descriptions can change. Check the company's website for its current services and locations.

Outsourcing bookkeeping services by metro

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “outsourcing bookkeeping services”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many outsourcing bookkeeping services are there based in the United Kingdom?

RevenueBase identified 1,891 company matches for outsourcing bookkeeping services associated with the United Kingdom as of September 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

Outbooks tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city has the most outsourcing bookkeeping services?

London leads with 332 company records, followed by Manchester (31) and Bristol (26).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 1,879 professional contacts with verified work emails tracked across these 1,891 companies; direct dials are available where recorded.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 21, 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 SmartSearch, 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.