David Kirk

What David Kirk does

David Kirk & Co. Ltd. is a UK sole-practitioner tax consultancy founded by David Kirk in 1991 (with focused tax work from 1998) and headquartered in Barthomley, Crewe, Cheshire. The firm specialises in payroll taxes and employment status, with particular depth in intermediary staffing companies (employment agencies and umbrellas), covering PAYE, National Insurance, IR35, the Construction Industry Scheme, and VAT treatment of staffing arrangements. The business model is engagement-based professional services: quote-priced advisory work plus, critically, defence against HMRC PAYE/NI/CIS/MSC assessments, which generates over a third of revenue. David Kirk (MA Oxford, FCA, CTA) personally handles client work or selects specialists for particular expertise, supported by a small team (stated headcount 1-5).

The firm has no technology platform or product suite; its only non-advisory asset is the published book 'Employment Status: a Tax Guide' (5th edition, Claritax Books), which functions as a thought-leadership and credibility instrument. Distribution is entirely direct, with GTM built on long-cycle reputation: representative cases include defence of a £2.75M accommodation benefit assessment, a £14M managed service company assessment, a £1.1M CIS assessment, and representation of 339 of approximately 2,000 victims of HMRC's MSC campaign. David Kirk served as the ICAEW representative on the official IR35 Forum from 2012 to 2021, providing regulatory visibility.

The business is founder-owned, privately held, UK-domestic only, with no external investment, no subsidiaries, and no M&A activity. Operating geographies are restricted to the United Kingdom; professional indemnity cover excludes the USA and Canada. The firm markets through content publishing (HMRC website, Taxation magazine, AccountingWeb) and its authoritative book rather than paid channels.

Name

David Kirk

Legal name

David Kirk & Co. Ltd.

Website

https://david-kirk.co.uk

Company type

Private

Founded year

1991

Operating status

Operating

Headcount range

1–10 employees

Short description

David Kirk & Co. Ltd. is a UK sole-practitioner tax consultancy specialising in payroll taxes and employment status, with particular depth in defending HMRC PAYE, National Insurance, IR35, CIS, and managed service company assessments for intermediary staffing companies and umbrella firms.

Ownership category

akta.pro rank

Product category

Tax Consultancy Services

NAICS

Offices of Certified Public Accountants (541211), Tax Preparation Services (541213), Other Accounting Services (541219)

SIC

Services-Legal Services (8111)

akta.pro primary industry

Tax Advisory & Compliance (BPAHABAB)

akta.pro secondary industries

Payroll & Employment Tax Services (BPAHABAD), Tax Law (BPAHAAAG)

Keywords

• Payroll tax consultancy
• Employment status advisory
• IR35 tax services
• HMRC inquiry defense
• Intermediary staffing taxation

Headquarters

HQ city

Barthomley

HQ country

United Kingdom

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Others

Revenue model

1. Tax Advisory Consulting: Fees from providing specialist tax consultancy services to clients on PAYE, National Insurance, employment status, IR35, Construction Industry Scheme, and intermediary staffing company matters. Revenue is generated through professional service engagements, with over a third coming from HMRC inquiry defense work.
2. Book Publishing Royalties: Royalty income from the publication 'Employment Status: a Tax Guide' published by Claritax Books, now in its 5th edition.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels3 records

Core offering

David Kirk & Co. Ltd. is a niche tax consultancy offering specialist advice and representation on payroll taxes (PAYE and National Insurance), employment status, IR35, the Construction Industry Scheme, and tax for intermediary staffing companies (employment agencies and umbrellas). The firm both provides proactive tax advice to prevent problems and defends clients in HMRC Revenue inquiries and tax tribunal cases.

Product overview

David Kirk & Co. Ltd. is a niche tax consultancy offering a personal service in payroll taxes and employment status, with particular reference to intermediary staffing companies. The firm's core service is tax consultancy and Revenue inquiry representation, supplemented by a published book 'Employment Status: a Tax Guide'. Services cover PAYE, National Insurance, IR35, Construction Industry Scheme, and tax issues for employment agencies and umbrella companies. The offering is a single-service consultancy rather than a platform-based product.

Differentiator

Problem solved

Functional benefit

Products and services

• Tax Consultancy Services Niche tax consultancy providing specialist advice on payroll taxes and employment status, with particular reference to intermediary staffing companies (employment agencies and umbrellas). Covers PAYE, National Insurance, employment status, IR35, Construction Industry Scheme, and VAT issues for staffing arrangements. Services are delivered to UK businesses needing proactive tax structuring or HMRC inquiry representation.
• HMRC Revenue Inquiry Work Specialist defense and representation in HMRC inquiries and tax assessments, including managed service company investigations, Construction Industry Scheme disputes, and PAYE/National Insurance challenges. Aimed at employment agencies, umbrella companies, and other staffing intermediaries facing contested Revenue assessments.
• Employment Status: a Tax Guide Definitive practitioner reference book (5th edition) authored by David Kirk and published by Claritax Books, covering employment status determination for tax purposes including intermediary staffing companies and personal service companies. Targeted at tax practitioners and professionals needing reference guidance.

Quantifiable outcome

• Successfully defended £2.75M accommodation benefit assessment
• +4 more outcomes

Named customers4 records

Segments2 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Partnerships

Three partnerships are on record, tiered flagship and core.

• IR35 Forum (ICAEW Representative)flagshipStrategic or Co-development Partner · 1 January 2012Official industry forum bringing together HMRC, tax profession, and trade representatives to discuss IR35 policy and administration. David Kirk served as ICAEW representative from 2012 to 2021, providing direct input into government tax policy on employment status.
• HCC International Insurance Company PLCcoreOthersProfessional indemnity insurer as required under Provision of Services Regulations 2009. Insurer is HCC International Insurance Company PLC of Walsingham House, 35 Seething Lane, London EC3N 4AH. Territorial coverage is worldwide excluding USA and Canada.
• Claritax BookscoreStrategic or Co-development PartnerPublishing partner for 'Employment Status: a Tax Guide', now in its 5th edition. Claritax Books is a specialist tax publishing house through which the firm's authoritative book is distributed to tax practitioners.

Scale indicators3 records

Recent moves5 records

Expansion highlights3 records

Emerging players

• Moore Kingston Smith: London-based mid-tier accountancy with a dedicated tax service line. Comparable in size band and specialism-versus-generalist tension, and competes for SME and intermediary staffing clients seeking employment tax and IR35 advice.
• PKF Smith Cooper: Regional UK accountancy with a tax practice handling HMRC enquiries, PAYE/NIC and contractor-related matters. Closer in size and approach to a boutique specialist firm than to a Big Four, with overlap on employer-tax advisory for staffing-sector clients.

Broad incumbents

• Crowe UK: Mid-tier UK accountancy with a substantial tax practice that handles PAYE, employment tax and HMRC inquiry work for larger intermediary staffing clients. Comparable on tax advisory and dispute resolution, but delivered as part of a wider audit/advisory/outsourcing portfolio rather than a specialist employment-status boutique.
• Andersen LLP (UK): UK tax-led advisory firm (former Andersen Tax / AAG) operating across employment tax, IR35 and intermediary staffing. Direct overlap with David Kirk on tax advisory and HMRC inquiry defence, but as part of a multi-discipline, multi-territory advisory platform.
• Mazars UK: International mid-tier accountancy with a UK tax practice covering employment tax, PAYE and contractor tax matters. Overlaps David Kirk on advisory and dispute work for staffing/umbrella clients but competes on breadth rather than specialist employment-status depth.
• BDO UK: Major UK accountancy network with significant employment-tax and HMRC dispute resolution capability. Overlaps David Kirk's intermediary staffing work via its employer tax and people advisory services, but as part of a full-service line-up rather than a single specialist niche.
• MHA MacIntyre Hudson: Top-15 UK accountancy group with a dedicated tax practice covering employment tax, IR35 and CIS. Competes for the upper-mid end of the intermediary staffing tax advisory market but lacks David Kirk's pure-play specialism in employment-status litigation.
• RSM UK: Large UK audit, tax and consulting firm with employment-tax and payroll-tax practices that serve staffing and umbrella clients. Similar big-firm scale and breadth compared with David Kirk's boutique model, but with more resourcing for high-volume inquiry defence.

Direct peers

• Markel Tax Solutions: Specialist payroll-tax and IR35 advisory operating in the umbrella company and staffing sector. Closely overlaps David Kirk's niche on PAYE/NIC, managed service company and umbrella tax disputes, with comparable IRS-style representation services for affected intermediaries.
• QDOS (formerly Qdos Consulting): UK specialist IR35 and employment-status tax advisory competing head-on with David Kirk on contractor, umbrella and intermediary staffing mandates. Both firms sell deep employment-status expertise and HMRC inquiry defence to the same intermediary staffing and contractor client base.

Market position

Strengths5 records

Weaknesses4 records

Competitive moat4 records

Key risks6 records

Key highlights6 records

Customer concentration

Compliance1 record

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about David Kirk