Company lists · Data refreshed September 2026
Top 25 Outsourcing bookkeeping services based in the United Kingdom
RevenueBase identified 1,891 outsourcing bookkeeping services headquartered in 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 outsourcing bookkeeping services 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 21, 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.
The 25 largest outsourcing bookkeeping services based in the United Kingdom
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 477 contacts → | ||||
Strong evidence “Outbooks is a leading provider of outsourcing services to accounting and bookkeeping firms.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 2 | 423 contacts → | ||||
Partial evidence “Corient is a specialist outsourced accounting and bookkeeping partner, built exclusively for UK accountancy practices.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 3 | 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 21, 2026Thanks. The Data Team will review it. | |||||
| 4 | 104 contacts → | ||||
Partial evidence “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…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 5 | 96 contacts → | ||||
Partial evidence “Affinity Outsourcing is an accountancy outsourcing company that specialises in outsourcing for Accounting Practices.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 6 | 88 contacts → | ||||
Partial evidence “Sapphire is an accounting outsourcing company set up for accounting firms in UK and is based in India.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 7 | 64 contacts → | ||||
Indirect 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 21, 2026Thanks. The Data Team will review it. | |||||
| 8 | 56 contacts → | ||||
Indirect 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 21, 2026Thanks. The Data Team will review it. | |||||
| 9 | 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 21, 2026Thanks. The Data Team will review it. | |||||
| 10 | 53 contacts → | ||||
Indirect evidence “At Artifin Accountants we strive to provide a more open experience of accounting services for business owners.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 11 | 44 contacts → | ||||
Indirect evidence “We offer a CFO-led virtual finance team.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 12 | 42 contacts → | ||||
Indirect evidence “At PSB Accountants, we put your goals and aspirations first.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 13 | 39 contacts → | ||||
Indirect evidence “Glazers is a well-established and progressive firm of accountants based in North West London.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 14 | 35 contacts → | ||||
Indirect evidence “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…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 15 | 35 contacts → | ||||
Indirect evidence “Accounting for Startups.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 16 | 33 contacts → | ||||
Partial evidence “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…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 17 | 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 21, 2026Thanks. The Data Team will review it. | |||||
| 18 | 29 contacts → | ||||
Indirect evidence “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.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 19 | 29 contacts → | ||||
Indirect evidence “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.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 20 | 29 contacts → | ||||
Partial evidence “Finex Accounting is an outsourcing accountancy service provider.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 21 | 27 contacts → | ||||
Indirect evidence “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…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 22 | 22 contacts → | ||||
Strong 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 21, 2026Thanks. The Data Team will review it. | |||||
| 23 | 22 contacts → | ||||
Partial evidence “Simplified Online Accounting | Customized Bookkeeping | Expert Payroll Services Making Finances Easier: Welcome to AffoTax.com, where we're changing how small businesses handle…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 24 | 21 contacts → | ||||
Partial evidence “AccNet Solutions was formed in November 2010 by Damitha Ukuwela as a firm providing accounting and bookkeeping solutions.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 25 | 21 contacts → | ||||
Indirect evidence “We are a small accountancy firm with offices in Cambridge and Stamford.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
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: outsourcing bookkeeping services. 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 outsourcing bookkeeping services.
- Partial evidence
- Its own public description names part of outsourcing bookkeeping services, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name outsourcing bookkeeping services. 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 1,891 outsourcing bookkeeping services based in the United Kingdom
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Outsourcing bookkeeping services based in the United Kingdom at a glance
As of Sep 21, 2026Companies by employee count
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
Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among outsourcing bookkeeping services, 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 “outsourcing bookkeeping services”. 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 outsourcing bookkeeping services), 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 outsourcing bookkeeping services, 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, 1,879 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 21, 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.
Outsourcing bookkeeping services by metro
- Outsourcing bookkeeping services in London332
- Outsourcing bookkeeping services in Manchester31
- Outsourcing bookkeeping services in Bristol26
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 outsourcing bookkeeping services, 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 outsourcing bookkeeping services are there based in the United Kingdom?
RevenueBase identified 1,891 outsourcing bookkeeping services 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 outsourcing bookkeeping services?
London leads with 332 headquartered companies, 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 the top results, verified emails and direct dials included. Upgrading unlocks all 1,879 verified decision-maker contacts tracked across these 1,891 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 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 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.
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