Company lists · Data refreshed September 2026

Top 25 Online accounting companies based in the United Kingdom

Name: Online accounting 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 21, 2026 2,168 companies tracked

RevenueBase identified 2,168 company matches for online accounting companies associated with the United Kingdom as of September 2026 and tracks 9,165 professional contacts across them, including 3,087 with verified work emails. London is the largest hub.

This list covers company matches for online accounting companies 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

2,168Companies

9,165Contacts tracked

3,087Verified emails

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The 25 largest online accounting companies based in the United Kingdom

Ranked by team size

Top 25 of 2,168 company matches for online accounting companies 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	Freeagent	Exact match	Edinburgh, United KingdomHQ recorded Sep 21, 2026	51-200	322 contacts →
	Exact match “One product.🤳 17 years.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
3	Looking For NEW Opportunities	Exact match	Stapleford, United KingdomHQ recorded Sep 21, 2026	n/a	296 contacts →
	Exact match “Accounting services for sole traders and SME’s.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
4	INFLO	Exact match	Houghton Le Spring, United KingdomHQ recorded Sep 21, 2026	51-200	156 contacts →
	Exact match “Inflo transforms the accounting profession by making leading-edge technologies accessible to all.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
5	Crunch	Exact match	Hove, United KingdomHQ recorded Sep 21, 2026	51-200	118 contacts →
	Exact match “We provide accounting software, services & solutions that have a big impact on small UK businesses.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
6	FLB Accountants LLP	Exact match	Wokingham, United KingdomHQ recorded Sep 21, 2026	51-200	107 contacts →
	Exact match “FLB is a firm of accountants providing core accounting services to a range of clients from start-ups, owner-managed businesses and private clients, to large corporates and…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
7	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
8	SJD Accountancy	Exact match	Hemel Hempstead, United KingdomHQ recorded Sep 21, 2026	501-1,000	102 contacts →
	Exact match “SJD is now Caroola Accountancy!” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
9	Rayner Essex LLP	Exact match	St Albans, United KingdomHQ recorded Sep 21, 2026	51-200	98 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
10	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
11	More Than Accountants	Exact match	Bolton, United KingdomHQ recorded Sep 21, 2026	51-200	93 contacts →
	Exact match “More Than Accountants is an industry leader when it comes to cutting edge accountancy services and business growth, we utilise the latest technology to help us achieve both our…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
12	Capium	Exact match	London, United KingdomHQ recorded Sep 21, 2026	11-50	81 contacts →
	Exact match “Capium is an online accounting & practice management software, tailored specifically for accounting practices.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
13	Xledger UK	Exact match	Bristol, United KingdomHQ recorded Sep 21, 2026	201-500	65 contacts →
	Exact match “Xledger is a leading provider of cloud-based finance software.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
14	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
15	The Accountancy Partnership	Exact match	Wirral, United KingdomHQ recorded Sep 21, 2026	51-200	62 contacts →
	Exact match “We offer online accounting services which simplify tax and finances for small businesses, by providing a fresh alternative to old-school high street accountants.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
16	NOMI	Exact match	London, United KingdomHQ recorded Sep 21, 2026	11-50	62 contacts →
	Exact match “Nomi is the ultimate cloud accounting suite built for accountants and bookkeepers.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
17	Stellaripe	Exact match	London, United KingdomHQ recorded Sep 21, 2026	51-200	58 contacts →
	Exact match “We are on a mission to help accountants to grow their accountancy practice and become more profitable.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
18	Mazuma	Exact match	Bridgend, United KingdomHQ recorded Sep 21, 2026	11-50	54 contacts →
	Exact match “Your Accountant.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
19	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
20	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
21	We'll Mind Your OWN Business LTD	Exact match	London, United KingdomHQ recorded Sep 21, 2026	11-50	44 contacts →
	Exact match “In business we grow, we develop, and we change, ensure you are working with an accountancy firm that will see and understand your brand and your goals.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
22	Iris Accountancy	Exact match	Slough, United KingdomHQ recorded Sep 21, 2026	1,001-5,000	42 contacts →
	Exact match “IRIS is a long-established industry leader in accounting software and services for accountants and bookkeepers.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
23	Pegasus Software	Exact match	Kettering, United KingdomHQ recorded Sep 21, 2026	51-200	41 contacts →
	Exact match “Pegasus Software is one of the UK's leading suppliers of accounting software, cloud accounting software, business solutions and payroll software and has been for over 30 years.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
24	Ascendant	Exact match	London, United KingdomHQ recorded Sep 21, 2026	201-500	40 contacts →
	Exact match “Accounting.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
25	Acting Office	Exact match	London, United KingdomHQ recorded Sep 21, 2026	51-200	35 contacts →
	Exact match “At Acting Office we deliver a fully integrated software platform designed for modern accountancy practices that want precision, efficiency and complete visibility across their…” 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 “online accounting companies”. 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 2,168 online accounting companies based in the United Kingdom

See the full list, filter by size, metro and specialty, and access 3,087 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Online accounting companies based in the United Kingdom at a glance

As of Sep 21, 2026

33.7%Verified-email coverage

4.2Average contacts per company

1-10Median size (employees)

17.9%Largest-city concentration · London

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

1,800

11-50

289

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 2,168 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 “online accounting companies” 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 3,087 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.

Online accounting companies 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 “online accounting companies”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many online accounting companies are there based in the United Kingdom?

RevenueBase identified 2,168 company matches for online accounting companies 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 online accounting companies?

London leads with 389 company records, followed by Manchester (49) and Bristol (40).

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 3,087 professional contacts with verified work emails tracked across these 2,168 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.