Bookkeeping Companies Using Site Kit in the UK: 120 Active Firms (2026)
Bookkeeping firms using website analytics provide payroll, accounts and compliance support while maintaining measurable UK client-acquisition websites.
For bookkeeping and payroll practices, the analytics plug-in usually sits between a content-managed marketing site and a partner-led sales process. It gives non-specialist teams a single view of search visibility, page traffic and basic acquisition signals, rather than the broader event taxonomy expected in enterprise analytics. Adoption therefore tends to mark firms that have moved beyond referral-only work: they publish service pages, local tax or payroll content, and contact journeys that someone is expected to monitor. Engagements are still modest, with website, compliance and client-service duties often handled by overlapping staff.
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Across UK bookkeeping and payroll, 120 actively trading companies are running the plug-in, and they report 2,349 employees in total. Within 1,347 sector websites with detected analytics, the system sits second in the category ranking at 8.9%, behind the main general-purpose analytics tag but just ahead of specialist monitoring and behaviour tools. The registered-office skew is not London-only: North West accounts for 15.8% of users, South East 15.0%, London 14.2%, West Midlands 12.5% and South West 10.8%.
Bookkeeping and payroll firms sell trust before software, so measurement stacks tend to be constrained by privacy notices, cookie consent and the handling of enquiry forms that may contain payroll or tax context. GDPR and ICO guidance matter even where analytics is used only for marketing, because small practices often route web enquiries directly to client-service mailboxes or shared workflow systems. Procurement is usually light-touch, but franchise networks, multi-office practices and outsourced finance providers tend to care more about admin access, retention settings and whether marketing suppliers can see client-identifiable information.
Adoption appears likely to track marketing maturity rather than practice size alone. Smaller practices that rely on referrals may keep basic analytics in place through bundled website maintenance, while multi-office providers tend to add more formal tagging, call tracking and client-acquisition reporting as ownership of marketing becomes less ad hoc. The main drag is not technical complexity; it is the limited time that bookkeeping teams can give to interpreting traffic and enquiries. Consolidation among practice groups may also favour shared templates and centrally managed measurement, leaving less room for idiosyncratic local-site setups.
Adoption by company size
Adoption of Site Kit rises with company size across the trading UK bookkeeping companies in this cohort. 0.5% of the 16,109 companies with under 10 employees run Site Kit (87 detected). 3.9% of the 830 companies with 10–50 employees run Site Kit (32 detected). 7.1% of the 42 companies with over 50 employees run Site Kit (3 detected). That is a 6.6% gap between the over 50 employees and under 10 employees bands.
120
Active firms
2026
8.9%
Of detected Analytics share
UK bookkeeping
6
Median headcount
Filed accounts
212
Verified contacts
Across this cohort
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Key facts
About 2% of the trading cohort reports turnover above £5M (3 of 120 firms) — the rest sits below that revenue band.
3% of the cohort was incorporated since 2022 (4 firms), so a sizeable share is in its first few filing cycles.
Within bookkeeping, this analytics system accounts for 8.9% (120) of 1,347 firms with a detectable analytics product, behind the largest detected option at 85.1% (1,146) and just ahead of another at 8.1% (109).
North West-registered bookkeeping firms account for 15.8% (19) of the cohort, with the South East at 15.0% (18), London at 14.2% (17) and the West Midlands at 12.5% (15).
Website stacks are largely content-management-led: 99.2% (119) also run a content-management system, while 62.5% (75) show SEO tooling.
Measurement tends to be layered, with 80.0% (96) also running another analytics tag, 35.8% (43) using tag-management tooling and 22.5% (27) showing cookie-consent tooling.
All detected users sit in Accounting & Audit at 100.0% (120), while smaller overlaps with Wealth Management at 6.7% (8), Recruitment & Staffing at 4.2% (5), Management Consulting at 3.3% (4) and Legal Services at 3.3% (4) point to mixed client-service lines.
WordPress plugins market share among UK Bookkeeping
Share of the 1,347 UK Bookkeeping with a detectable system. As of June 2026.
What else do Site Kit-running Bookkeeping run?
Share of the 120 Site Kit-running UK companies where each technology was also detected. As of June 2026.
Where Site Kit Bookkeeping are, and how healthy they look
By region
By registered-office region; companies without a regional match count toward Rest of UK.
By financial health
From filed accounts; firms with fewer than two filings show as insufficient history.
6
Median headcount
£262.5K
Median UK turnover
2.5%
Above £5M turnover
4
Incorporated since 2022
212 verified decision-maker contacts
across these 120 companies, with emails available in Firmbase. Filter by role, seniority and stack.
Top UK Bookkeeping using Site Kit
Ranked by sales-readiness score: an AI model assesses what each company does, its sector and size, and scores its overall fit. Best-fit prospects appear first.
Financial sub-scores
Computed from 5 filingsProvides bookkeeping and accounting services for small businesses and sole traders, including payroll administration, management accounts, VAT and tax return preparation, financial record keeping,…
Serves small businesses and sole traders needing bookkeeping, payroll, management accounts and tax return support, including VAT, PAYE and CIS compliance.
Financial Health
HealthyHealthy
Location
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Financial sub-scores
Computed from 5 filingsProvides accounting and bookkeeping services for businesses, sole traders and landlords, including annual accounts, VAT returns, payroll and tax support. Also offers outsourced finance department…
Serves businesses across the UK, including start-ups, sole traders, partnerships, landlords and ecommerce operators, with emphasis on companies needing ongoing finance, payroll and digital accounting…
Financial Health
StableStable · 0% CAGR over 4y
Location
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Financial sub-scores
Computed from 5 filingsProvides outsourced accounting and finance services for businesses, including bookkeeping, management accounts, VAT returns, payroll, annual accounts, tax compliance, financial modelling, and…
Serves ambitious UK businesses, from startups and scale-ups to established enterprises, especially owners and leadership teams wanting outsourced finance support and Xero-based accounting.
Financial Health
WeakWeak · -3% CAGR over 4y
Location
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Financial sub-scores
Computed from 5 filingsProvides accountancy and business advisory services for small and medium-sized companies and start-ups, including bookkeeping, payroll, tax compliance, statutory accounts, management accounts,…
Serves small and medium-sized companies and start-ups, including businesses seeking outsourced finance support, cloud/Xero accounting, payroll, tax, forecasting, reporting or growth-stage finance…
Financial Health
StrongStrong · Growing, Hiring · 30% CAGR over 4y
Location
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Financial sub-scores
Computed from 3 filingsProvides payroll and accountancy services for businesses, agencies and contractors, including PAYE and umbrella payroll, CIS payroll administration, bookkeeping, VAT and tax returns, year-end…
Serves businesses and independent contractors, including recruitment agencies, employers, accountants, CIS contractors and personal service companies.
Financial Health
StrongStrong · Growing, Hiring · 13% CAGR over 2y
Location
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Financial sub-scores
Computed from 5 filingsProvides accountancy and payroll services for small businesses and sole traders, including bookkeeping, accounts preparation, tax returns, VAT returns, payroll processing, and Construction Industry…
Serves small businesses, sole traders and limited companies needing outsourced accounts and payroll, including tradespeople in construction, contractors/subcontractors, and property investors,…
Financial Health
StrongStrong · Hiring · 14% CAGR over 4y
Location
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Financial sub-scores
Computed from 4 filingsProvides accounting services for businesses, including bookkeeping, management accounts, tax return preparation and filing, budgeting and cash‑flow forecasting, and payroll administration. Uses cloud…
Serves UK business owners, startups and small to mid-sized companies that want an ongoing accountancy relationship, transparent fees and practical financial support as their needs change.
Financial Health
StrongStrong · Growing, Hiring · 5% CAGR over 3y
Location
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Financial sub-scores
Computed from 4 filingsProvides audit and assurance, tax advisory including R&D tax claims, bookkeeping, management accounts, payroll processing, and business consultancy services to startups and established companies,…
Serves UK start-ups and established businesses, including SMEs, franchises, micro businesses and other accountancy practices, plus business owners, finance teams and individuals needing…
Financial Health
StrongStrong · Hiring · 122% CAGR over 3y
Location
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Financial sub-scores
Computed from 5 filingsProvides accounting and tax services for businesses and individuals, including bookkeeping, management accounts, corporate tax, VAT compliance, payroll, pensions auto‑enrolment, company secretarial…
Serves small and medium-sized businesses, self-employed professionals, contractors, landlords, expats and high net worth individuals needing accounting and tax support.
Financial Health
HealthyHealthy · 0% CAGR over 4y
Location
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Financial sub-scores
Computed from 5 filingsProvides accounting services for businesses and individuals, including preparation of accounts and tax returns, bookkeeping, VAT and payroll processing, tax advice, company secretarial support,…
Serves small businesses, startups, self-employed professionals and individuals with taxable income, including VAT-registered businesses and property landlords, primarily in Devon.
Financial Health
HealthyHealthy · Hiring · 6% CAGR over 4y
Location
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Financial sub-scores
Computed from 3 filingsProvides accounting, bookkeeping, audit and assurance, corporate and personal tax services, VAT and payroll support, company secretarial work, and business advisory services, including estate…
Serves growth-minded businesses and private clients, mainly in Central and West London, including construction, medical, veterinary, retail, energy, infrastructure, real estate, estate agency,…
Financial Health
StableStable · Hiring · 8% CAGR over 2y
Location
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Financial sub-scores
Computed from 5 filingsProvides outsourced payroll and bookkeeping services for businesses and accountancies. Services include payroll processing, payslips, auto‑enrolment pension administration, VAT returns,…
Serves UK businesses needing outsourced payroll and bookkeeping support, including small businesses, NHS providers, hospitality venues, self-employed professionals and accountancy firms seeking…
Financial Health
StableStable · Hiring · 6% CAGR over 4y
Location
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Financial sub-scores
Computed from 5 filingsProvides accountancy and tax advisory services for small and medium-sized businesses and individuals, including bookkeeping, VAT, payroll and CIS, company and personal tax returns, self‑employed…
Serves small and medium-sized businesses, start-ups, self-employed individuals and personal tax clients, primarily in Sussex, including companies seeking outsourced finance department support.
Financial Health
HealthyHealthy · Hiring · 8% CAGR over 4y
Location
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Financial sub-scores
Computed from 3 filingsProvides accountancy services for businesses and individuals, including bookkeeping, VAT returns, payroll, self‑assessment tax returns, and accounts for limited companies. Also prepares business…
Serves small businesses, start-ups, limited companies and self-assessment taxpayers in Leeds and Yorkshire, with focus on construction/CIS, pubs and restaurants, hair/beauty/fitness, consultants,…
Financial Health
StableStable
Location
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Financial sub-scores
Computed from 5 filingsProvides accountancy and tax services for businesses and individuals, including bookkeeping, company accounts, tax returns, payroll, VAT returns, company formation, CIS claims, and HMRC enquiry…
Sells to small businesses, startups, limited companies and self-employed individuals, including freelancers, contractors, doctors, property income clients, and construction companies and…
Financial Health
HealthyHealthy · -4% CAGR over 4y
Location
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Computed from 5 filingsProvides accountancy services for small businesses, including bookkeeping, management accounts, tax planning, VAT returns, payroll, financial forecasting and budgeting, and company secretarial…
Serves entrepreneurs, small business owners and growing companies in Derby and the East Midlands business community.
Financial Health
HealthyHealthy · Hiring · 5% CAGR over 5y
Location
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Financial sub-scores
Computed from 5 filingsProvides accountancy and tax services including annual accounts preparation, bookkeeping, payroll, VAT returns, self‑assessment and capital gains tax advice. Supports contractors, sole traders,…
Serves small businesses, contractors, sole traders, startups, landlords and freelancers, including construction, IT, creative, ecommerce, engineering, estate agency and professional services clients…
Financial Health
StableStable · Hiring · 9% CAGR over 4y
Location
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Financial sub-scores
Computed from 5 filingsProvides accounting and tax services including bookkeeping, payroll processing, VAT and corporate tax planning, R&D tax relief claims, and business advisory. Also offers outsourced finance functions,…
Serves UK businesses, healthcare providers, contractors, property investors, high-net-worth individuals and professionals, with sector focus on GP surgeries, PCN networks, dental practices,…
Financial Health
WeakWeak · 0% CAGR over 4y
Location
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Financial sub-scores
Computed from 5 filingsProvides accountancy and bookkeeping services for businesses and individuals, including day-to-day bookkeeping, payroll processing, preparation of tax returns, financial reporting, and ongoing…
Serves UK businesses and individuals, including sole traders, small startups, growing limited companies and established businesses needing accountancy and bookkeeping support.
Financial Health
StrongStrong · Growing, Hiring · 11% CAGR over 4y
Location
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Financial sub-scores
Computed from 5 filingsProvides accountancy and financial management services for businesses, including bookkeeping, VAT returns, payroll, management accounts, corporation tax, personal tax, and tax investigations. Also…
Serves small businesses, owner-managed companies and tech entrepreneurs in the UK, particularly firms needing external finance support for tax, payroll, VAT, bookkeeping and business growth matters.
Financial Health
HealthyHealthy · Growing, Hiring · 6% CAGR over 4y
Location
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Financial sub-scores
Computed from 3 filingsProvides accounting and tax services for businesses and individuals, including financial accounting, business and personal tax returns, bookkeeping, VAT reporting, payroll processing, management…
Serves UK small businesses, limited company owners, sole traders and individuals with personal tax affairs, including businesses accountable to HMRC, Companies House, shareholders, banks, investors…
Financial Health
StrongStrong · Growing, Hiring · 22% CAGR over 2y
Location
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Financial sub-scores
Computed from 5 filingsProvides accounting and bookkeeping services for small businesses, sole traders and limited companies, including payroll, VAT returns, tax planning, year‑end accounts and self‑assessment. Also offers…
Serves businesses and self-employed clients, including start-ups, SMEs, sole traders, limited companies and partnerships. Targets organisations needing accounting support, with emphasis on clients in…
Financial Health
StrongStrong · Hiring · 50% CAGR over 4y
Location
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Computed from 5 filingsProvides accounting and tax services for businesses, including statutory accounts preparation, bookkeeping, payroll processing, management accounts, tax planning and compliance, new business setup…
Serves businesses and entrepreneurs, including sole traders, partnerships, LLPs and limited companies, primarily around Reading/Berkshire and London, plus employers using payroll/CIS and owners…
Financial Health
WeakWeak · 0% CAGR over 4y
Location
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Computed from 4 filingsProvides accounting and bookkeeping services for small businesses and individuals, including year-end accounts, tax return preparation, payroll processing, VAT and CIS returns, management accounts,…
Serves small businesses and individuals, including small limited companies, partnerships, sole traders, LLPs, contractors/subcontractors using CIS, smaller employers, and charities, with clients…
Financial Health
StableStable · 0% CAGR over 3y
Location
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Computed from 5 filingsProvides accountancy and business advisory services, including accounts preparation, corporation and personal tax compliance, payroll processing, and business advice and mentoring for small and…
Serves business owners and organisations of all sizes and sectors, primarily around Renfrewshire and Glasgow, with clients also across Scotland and the wider UK.
Financial Health
StrongStrong · Hiring · 3% CAGR over 4y
Location
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Computed from 5 filingsProvides accounting and finance support to businesses, including bookkeeping, tax planning and compliance, payroll processing, preparation of annual accounts and returns, financial and management…
Serves growing local businesses in Warwick and Leamington Spa that need outsourced finance support, including owners seeking bookkeeping, accounting, tax, payroll and part-time finance director input.
Financial Health
WeakWeak
Location
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Computed from 5 filingsProvides accountancy and tax advisory services for businesses and individuals, including bookkeeping, financial accounts preparation, payroll, VAT reporting, tax compliance, and support with company…
Serves local small and medium-sized businesses, start-ups and individual taxpayers, offering support to business owners and people needing personal tax help in Hartley Wintney and surrounding areas.
Financial Health
StableStable · -4% CAGR over 4y
Location
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Computed from 5 filingsProvides accounting and tax services for businesses and individuals, including bookkeeping, company accounts, tax compliance, self‑assessment, VAT, payroll, company formation, and corporation tax.…
Serves individuals, landlords and property owners, contractors/freelancers, and businesses, with an emphasis on clients across London and some national customers.
Financial Health
HealthyHealthy · -3% CAGR over 4y
Location
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Computed from 5 filingsProvides accounting and business support services including bookkeeping, payroll, VAT returns, tax compliance, year-end accounts, and self-assessment. Also offers cash flow management, forecasting,…
Serves Manchester-area business owners and SMEs, including owner-run limited companies, partnerships and sole traders, with some focus on business services and care homes.
Financial Health
StrongStrong · Hiring · 197% CAGR over 4y
Location
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Computed from 3 filingsProvides accountancy and business advisory services including accounts preparation, auditing, payroll administration, cloud accounting, and specialist tax advice. Also offers VAT support, tax…
Serves UK businesses, charities and individuals, with a focus on creative industries, property businesses, not-for-profits, engineering firms and manufacturers.
Financial Health
StableStable · -3% CAGR over 2y
Location
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Computed from 3 filingsProvides accountancy and financial advisory services including annual accounts, audit, bookkeeping, payroll, VAT and tax compliance, business tax planning, corporate finance advice, and cloud…
Serves businesses and individuals across Cheshire and Staffordshire, including start-ups, contractors, sole traders, partnerships, LLPs, limited companies, landlords, charities, trusts and financial…
Financial Health
HealthyHealthy · Hiring · 7% CAGR over 2y
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Computed from 3 filingsProvides accountancy and business advisory services including bookkeeping and cloud accounting, payroll administration, statutory accounts preparation, auditing, and specialist tax planning and…
Sells to businesses and organisations needing accounting support, particularly creative firms, property businesses, charities, engineering and manufacturing companies. Serves UK clients, including…
Financial Health
StableStable · 0% CAGR over 2y
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Computed from 5 filingsProvides accountancy services for sole traders, partnerships and companies, including preparation of annual accounts, auditing, VAT returns and Making Tax Digital submissions, payroll administration,…
Serves self-employed individuals, sole traders, partnerships, SMEs and larger limited companies, with clients in Newcastle, the North East and beyond.
Financial Health
StableStable · Hiring · 6% CAGR over 4y
Location
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Computed from 2 filingsProvides accountancy and business advisory services including audit and assurance, tax compliance and planning, payroll, corporate finance, outsourced finance functions, wealth management, IT…
Serves UK businesses and individuals, including food production, industrial and logistics, retail and wholesale, technology, professional services, and organisations trading internationally.
Financial Health
HealthyHealthy · Profitable, Growing, Hiring · 109% CAGR over 1y
Location
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Computed from 5 filingsProvides accounting and bookkeeping services for self‑employed individuals, partnerships, LLPs and limited companies. Handles company formation, tax returns, VAT and CIS reporting, payroll, Companies…
Serves UK-based limited companies, LLPs, partnerships and self-employed individuals, including employers and CIS contractors/subcontractors needing accounting and tax support.
Financial Health
StrongStrong · Hiring · 3% CAGR over 4y
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Computed from 3 filingsProvides accountancy and tax advisory services for individuals and businesses, including preparation of financial statements, bookkeeping system setup and software support, payroll and CIS…
Serves individuals, self-employed people, partnerships and companies in the UK and overseas needing accounting, compliance, payroll and tax advisory support.
Financial Health
StrongStrong · Hiring · 12% CAGR over 2y
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Computed from 4 filingsProvides accounting and tax advisory services including annual accounts, bookkeeping, payroll, VAT returns and self‑assessment. Offers management accounts, forecasting, business planning, valuations,…
Serves small businesses, sole traders and growth-stage companies, plus residential managing agents, charities and non-profits. Also targets individuals needing tax return and tax planning support.
Financial Health
StrongStrong · Growing, Hiring · 9% CAGR over 3y
Location
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Computed from 5 filingsProvides accounting and bookkeeping services for businesses, including tax preparation, management accounts, payroll administration, and financial systems consultancy. Supports owner‑managed…
Serves owner-managed businesses, startups and established SMEs across varied sectors, including limited company owners seeking ongoing finance and compliance support.
Financial Health
HealthyHealthy · Hiring · 5% CAGR over 4y
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Computed from 3 filingsProvides accounting and tax services for individuals and small businesses, including bookkeeping, VAT, CIS, payroll, self‑assessment, business accounts, management accounts, financial director…
Serves small business owners and owner-managed companies in Stafford, alongside individuals needing self-assessment support. Targets business owners seeking an ongoing accounting partner.
Financial Health
HealthyHealthy · -11% CAGR over 2y
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Computed from 5 filingsProvides accounting and tax services including personal and partnership tax returns, statutory accounts, corporation tax and VAT returns, bookkeeping, payroll, management accounts, tax planning, cash…
Serves individuals, partnerships and small businesses with tax, accounts and payroll requirements, including limited companies needing VAT, corporation tax and Companies House compliance.
Financial Health
StrongStrong · Growing, Hiring · 7% CAGR over 4y
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Computed from 5 filingsProvides accounting, bookkeeping and tax services for small and medium-sized businesses. Offers cloud accounting using Xero, strategic business advisory, finance team support, and statutory…
Serves SMEs and small business owners, especially owner-managed businesses seeking external finance, tax, payroll and cloud accounting support.
Financial Health
HealthyHealthy · Hiring · 43% CAGR over 4y
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Computed from 5 filingsProvides accountancy and tax services for individuals and businesses, including self‑assessment tax returns, corporation tax planning and compliance, VAT returns, payroll processing, bookkeeping,…
Serves small businesses, limited companies, landlords, sole traders and individuals in Dartford, Kent and South East London needing accountancy and tax support.
Financial Health
HealthyHealthy · Growing · 0% CAGR over 4y
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Computed from 5 filingsProvides accountancy services to businesses including bookkeeping, financial accounts preparation, tax planning and compliance, VAT returns, payroll processing, and management accounts. Also offers…
Serves local business owners in Falmouth and Penryn, including start-ups, established small businesses and firms looking to change accountants, with examples from hospitality clients.
Financial Health
StrongStrong · Growing · 0% CAGR over 5y
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Computed from 3 filingsProvides accountancy and business advisory services, including accounts preparation, corporation and personal tax returns, VAT, payroll, management accounting, financial forecasting, business…
Serves start-ups, growing businesses and individuals across Oxfordshire and nationwide, with sector focus on leisure, hospitality, music, professional services, property, construction, science,…
Financial Health
HealthyHealthy · Hiring · 5% CAGR over 2y
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Computed from 5 filingsProvides accountancy services to businesses, including bookkeeping, tax preparation and advice, payroll, VAT returns, and management accounts. Also offers business support, HMRC compliance…
Serves business owners and SMEs in Falmouth and Penryn, including start-ups, established companies and firms looking to change accountants, with clients across local sectors such as property and…
Financial Health
StrongStrong · Growing · 0% CAGR over 4y
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Computed from 5 filingsProvides accountancy and business advisory services including audit and assurance, tax planning and compliance, bookkeeping, payroll, VAT returns, company secretarial support, financial planning, and…
Serves individuals and businesses in and around Chesterfield, including start-ups, family businesses, SMEs, larger companies and private clients.
Financial Health
HealthyHealthy · Growing · 2% CAGR over 4y
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Computed from 3 filingsProvides accounting and business support services for businesses, including bookkeeping, VAT returns, payroll and PAYE administration, and general financial administration support for small…
Serves businesses throughout the UK, from startups and small businesses to established enterprises, across professional services, industrial and trade, technology and e-commerce sectors.
Financial Health
StableStable · 3% CAGR over 2y
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Computed from 5 filingsProvides chartered accountancy services to businesses and individuals, including financial accounts preparation, audit, tax planning and compliance, bookkeeping, payroll processing, VAT returns,…
Serves business clients of all sizes, including startups and small businesses, plus individual clients needing accountancy and tax support, primarily across Yorkshire and beyond.
Financial Health
HealthyHealthy · Hiring · 3% CAGR over 4y
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Computed from 5 filingsProvides outsourced payroll services for businesses and accountancy firms, managing employee payroll processing, payslips, statutory calculations, submissions to HMRC, and related payroll…
Serves businesses of all sizes and accountancy firms, particularly in the North West, that need outsourced payroll support.
Financial Health
WeakWeak · Hiring · 32% CAGR over 4y
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Computed from 5 filingsProvides accountancy and management accounting services for businesses, including bookkeeping, payroll, preparation and submission of accounts and tax returns, financial reporting, forecasting and…
Serves SMEs and owner-managed businesses, including company directors and finance teams, that use cloud accounting technology and want an external accountant as part of their team.
Financial Health
StableStable · Hiring · 4% CAGR over 4y
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How Site Kit usage is detected
Company data
Detected companies are joined to UK Companies House records and XBRL accounts data. Revenue and headcount figures come from the most recent filed accounts; where the company has not filed, values are estimated using a model trained on filed history and peer benchmarks and are labelled as estimates.
Detection
Firmbase crawls the public website of actively-trading UK companies and fingerprints the technologies present: tracking scripts, embedded forms, chat widgets, CMS markers and similar signatures. A company is included in this list when one or more of the technology's signatures are found on its site; closely-related variants of the same product are grouped under one name. Detection covers what is visible on the public web — a company using the technology purely internally, with no website footprint, will not appear. Counts are therefore a conservative floor, not a ceiling. bookkeeping companies are identified using Firmbase's semantic classification of company activity, built from filings, websites and registered SIC codes rather than SIC codes alone. The detected counts and share figures on this page are computed within that sector cohort, so "share" always means share of bookkeeping companies with a detectable system — not of all UK companies.
Freshness
Websites are re-crawled on a rolling basis and the underlying company data is refreshed from Companies House continuously; filings appear within days of submission. The list and its statistics are regenerated when the detected cohort moves meaningfully. You can see the last-updated timestamp near the top of the page.
Sources
- Payroll Outsourcing Market Size & Share Analysis - Growth Trends and Forecast (2026 - 2031)
- Market Size (2026): USD 13.21 Billion.
- Market Size (2031): USD 17.83 Billion.
- Growth Rate (2026 - 2031): 6.19% CAGR.
- North America accounted for 40.70% of 2025 revenue.
- Asia-Pacific is the fastest-growing region at an 8.78% CAGR through 2031.
Site Kit is a trademark of its respective owner. Firmbase is not affiliated with, sponsored by, or endorsed by the trademark owner.
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Frequently asked questions
How many UK bookkeeping companies use Site Kit?
What share of UK bookkeeping companies run Site Kit?
How is Site Kit usage detected?
What size bookkeeping companies use Site Kit in the UK?
What do Site Kit-running bookkeeping companies also run?
Can I get contact details for these companies?
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