Company lists · Data refreshed September 2026

Top 25 Bpo accounting and tax services based in the United Kingdom

Name: Bpo accounting and tax 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 23, 2026 4,526 companies tracked

RevenueBase identified 4,526 company matches for bpo accounting and tax services associated with the United Kingdom as of September 2026 and tracks 28,733 professional contacts across them, including 9,116 with verified work emails and 1,253 with mobile numbers. London is the largest hub.

This list covers company matches for bpo accounting and tax 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 23, 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 23, 2026 How this list was built

4,526Companies

28,733Contacts tracked

9,116Verified emails

1,253Mobile numbers

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The 25 largest bpo accounting and tax services based in the United Kingdom

Ranked by team size

Top 25 of 4,526 company matches for bpo accounting and tax services based in the United Kingdom, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 23, 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	AAB	Exact match	Uk And Ireland, United KingdomHQ recorded Sep 23, 2026	1,001-5,000	1,125 contacts →
	Exact match “We provide services that help businesses at every stage of the lifecycle.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
2	Armstrong Watson	Exact match	Carlisle, United KingdomHQ recorded Sep 23, 2026	501-1,000	579 contacts →
	Exact match “Armstrong Watson has been advising and protecting clients across the North of England and Scotland since 1867.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
3	Outbooks	Exact match	Harrow, United KingdomHQ recorded Sep 23, 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 23, 2026 · View company records in RevenueBase
4	Corient Business Solutions Limited	Exact match	Coventry, United KingdomHQ recorded Sep 23, 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 23, 2026 · View company records in RevenueBase
5	Gravita	Exact match	London, United KingdomHQ recorded Sep 23, 2026	201-500	379 contacts →
	Exact match “Welcome to the new era of accountancy.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
6	SKS Business Services	Exact match	London, United KingdomHQ recorded Sep 23, 2026	501-1,000	322 contacts →
	Exact match “At SKS, we pride ourselves on being different.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
7	Paystream	Exact match	Altrincham, United KingdomHQ recorded Sep 23, 2026	201-500	313 contacts →
	Exact match “PayStream is a market leading business providing a range of payroll, umbrella, tax, software and accountancy services for recruitment agencies, contractors and other businesses.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
8	GI Outsourcing	Exact match	London, United KingdomHQ recorded Sep 23, 2026	201-500	311 contacts →
	Exact match “GI Outsourcing is a UK-based accountants outsourcing firm.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
9	Looking For NEW Opportunities	Exact match	Stapleford, United KingdomHQ recorded Sep 23, 2026	n/a	296 contacts →
	Exact match “Accounting services for sole traders and SME’s.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
10	Galloways Accounting	Exact match	Brighton, United KingdomHQ recorded Sep 23, 2026	201-500	187 contacts →
	Exact match “Galloways is the fastest growing accounting services firm in Sussex.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
11	EQ Accountants, Part Of The Sumer Group	Exact match	Dundee, United KingdomHQ recorded Sep 23, 2026	201-500	167 contacts →
	Exact match “In 2023, EQ Accountants became part of Sumer – a collaboration of renowned regional accountancy practices with a shared vision to champion local small to medium-sized enterprises.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
12	Ormerod Rutter Chartered Accountants	Exact match	Droitwich, United KingdomHQ recorded Sep 23, 2026	51-200	151 contacts →
	Exact match “For 40 years, Ormerod Rutter have offered the specialist hands-on support that clients need to handle all of their tax, business and financial affairs.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
13	Burgess Hodgson	Exact match	Canterbury, United KingdomHQ recorded Sep 23, 2026	51-200	140 contacts →
	Exact match “Burgess Hodgson are a Kent based accountancy firm with the skills and expertise to rival any other accountancy firm in the UK.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
14	HSJ Accountants, Business & TAX Advisors	Exact match	Newport, United KingdomHQ recorded Sep 23, 2026	51-200	134 contacts →
	Exact match “Award winning accountants & tax advisors based in Newport, South Wales.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
15	Accounts And Legal	Exact match	London, United KingdomHQ recorded Sep 23, 2026	11-50	133 contacts →
	Exact match “Traditional accountants do a great job of the numbers, but that's often as far as the service goes.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
16	David Allen	Exact match	Carlisle, United KingdomHQ recorded Sep 23, 2026	51-200	123 contacts →
	Exact match “David Allen was established in 1997 and now has a team of over 150 dedicated professionals working from our offices based in Carlisle, Dalston, Dumfries, Penrith and Workington.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
17	Debitam	Exact match	42-44 Bishopsgate, United KingdomHQ recorded Sep 23, 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 23, 2026 · View company records in RevenueBase
18	AOG	Exact match	London, United KingdomHQ recorded Sep 23, 2026	11-50	101 contacts →
	Exact match “Welcome to AOG, your esteemed accounting and tax partner, serving SMEs and high-net-worth individuals in the UK and abroad.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
19	Paperchase Business Services LTD	Exact match	London, United KingdomHQ recorded Sep 23, 2026	501-1,000	100 contacts →
	Exact match “Paperchase Business Services Ltd (PBSL) is a firm of accountants, taxation and business advisors based in South London.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
20	Sapphire Info Solutions P LTD	Exact match	London, United KingdomHQ recorded Sep 23, 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 23, 2026 · View company records in RevenueBase
21	Base Practice Support LTD Baseline Practice Support Smc-Pvt LTD	Exact match	London, United KingdomHQ recorded Sep 23, 2026	51-200	78 contacts →
	Exact match “Base Practice Support Ltd is the UK's fastest-growing Accountancy Practice Support company.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
22	Payescape LTD	Exact match	Northern Ireland, United KingdomHQ recorded Sep 23, 2026	51-200	67 contacts →
	Exact match “PayEscape is one of the UK’s fastest growing outsourced Payroll, HR and Time Management providers.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
23	Isosceles Finance	Exact match	Egham, United KingdomHQ recorded Sep 23, 2026	51-200	67 contacts →
	Exact match “Isosceles Finance Helping ambitious businesses grow Isosceles is a business services company supporting rapidly growing and investor-backed companies with fractional CFO services…” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
24	Affinity Associates Limited	Exact match	Wembley, United KingdomHQ recorded Sep 23, 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 23, 2026 · View company records in RevenueBase
25	Oasis Accountants Limited	Exact match	Chiswick Park, United KingdomHQ recorded Sep 23, 2026	11-50	63 contacts →
	Exact match “At Oasis Accountants we make sure to keep your business profitable.” Recorded in the RevenueBase company graph · Sep 23, 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 “bpo accounting and tax 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 4,526 bpo accounting and tax services based in the United Kingdom

See the full list, filter by size, metro and specialty, and access 9,116 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Bpo accounting and tax services based in the United Kingdom at a glance

As of Sep 23, 2026

31.7%Verified-email coverage

4.4%Mobile-number coverage

6.3Average contacts per company

1-10Median size (employees)

18.4%Largest-city concentration · London

Sep 23, 2026Page data refreshed

Companies by employee count

1-10

3,544

11-50

797

51-200

201-500

501-1,000

1,001-5,000

Freshness & accuracy

How recently the business emails were verified and the company information checked

Email last verified

Median 26.0d

6,7480–30

2,23531–60

10461–90

1090–180

19180+

Company record updated

Median 89.0d

00–30

1,74331–60

16,00161–90

9,34290–180

1,647180+

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 “bpo accounting and tax 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 9,116 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 23, 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.

Bpo accounting and tax 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 “bpo accounting and tax services”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many bpo accounting and tax services are there based in the United Kingdom?

RevenueBase identified 4,526 company matches for bpo accounting and tax 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?

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

Which city has the most bpo accounting and tax services?

London leads with 834 company records, followed by Manchester (93) and Birmingham (59).

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 9,116 professional contacts with verified work emails tracked across these 4,526 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 23, 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.