Accountancy that grows your business, not just your books
Harnett & Co delivers expert financial guidance to growing SMEs across West London and Surrey - from day-to-day compliance through to strategic Finance Director advisory, all managed personally by Damien Harnett FCA.
Comprehensive accountancy
for every stage of growth
From start-up formation to established SME - the full spectrum of accounting, tax and advisory services tailored to you.
Discuss Your Requirements →Bookkeeping & VAT Returns
Accurate, timely financial records are the bedrock of every well-run business. We maintain your books with precision, ensuring clarity at all times.
- Monthly profit & loss and balance sheets
- VAT returns preparation and HMRC submission
- Cash flow forecasts and budget preparation
- Company secretarial services
- Cloud accounting (Xero, QuickBooks, Sage)
Year-End Accounts & Corporation Tax
We prepare accurate statutory accounts whilst proactively identifying opportunities to reduce your corporation tax liability.
- Full annual and abbreviated statutory accounts
- Corporation tax computations and filing
- Capital gains tax planning
- HMRC liaison and compliance management
- R&D tax credit identification and claims
Payroll & HR Administration
From a small team to a growing workforce, we manage every aspect of payroll to keep your business compliant and your staff paid accurately.
- PAYE and National Insurance administration
- Real Time Information (RTI) submissions
- SSP, SMP and SPP statutory pay processing
- Auto-enrolment pension administration
- P11D and benefits-in-kind reporting
Audit & Assurance
Independent, thorough audit services conducted to current UK auditing standards, giving your stakeholders confidence in your financial statements.
- External statutory audit services
- Internal audit and controls review
- Regulatory audit liaison (FCA etc.)
- Forensic accounting and fraud investigation
- Risk identification and remediation reports
Management Accounts
Timely, meaningful management information that gives you genuine insight into performance and empowers confident decision-making.
- Monthly and quarterly management accounts
- Key performance indicator (KPI) reporting
- Variance analysis and commentary
- Financial dashboards and board packs
- Budget vs. actual performance reviews
Business Start-Up & Advisory
We guide new ventures through every financial decision from day one - structure, planning and building solid financial foundations.
- Incorporation advice and company formation
- Business plan and financial projection preparation
- Accounting system selection and setup
- Funding and investor readiness support
- Ongoing growth advisory and mentoring
Tax Investigation Support
Expert representation if HMRC opens an enquiry into your affairs.
Property & Landlord Accounting
Specialist tax for landlords, investors and rental portfolios.
International & Cross-Border Tax
Multi-jurisdiction advice including US market entry support.
Cloud Accounting & Technology
Migration and ongoing support with Xero, QuickBooks and Sage.
Company Secretarial Services
Statutory registers, confirmation statements and Companies House compliance.
Business Valuations
Independent valuations for acquisition, disposal or dispute resolution.
Business Restructuring
Strategic advice on restructuring for efficiency and improved tax position.
Cashflow Forecasting
Detailed cashflow models and scenario planning for financial resilience.
business operations
Five reasons our clients choose to stay with us
We go far beyond compliance - our mandate is to add genuine, measurable value to your business and ensure our fees more than pay for themselves.
Deep Experience & Technical Expertise
Over 35+ total years of chartered accountancy practice, underpinned by Big Four training at Deloitte in the City of London.
Genuine Business Understanding
Damien has run businesses directly for a decade, including as Finance Director for a medium-sized multinational - a perspective most practices cannot offer.
A Truly Personal Service
Every client account is personally managed by Damien Harnett. You will never be passed to a junior member of staff on matters requiring senior expertise.
Versatility Across All SME Sizes
We serve businesses of all sizes within the SME sector. No client is too small and no challenge falls outside our scope.
Outstanding Value for Money
Our fees are always competitive and, in most instances, the savings we identify more than offset the cost of our services.
Founded on expertise.
Built on real results.
Harnett & Co was established in 2009 by Damien Harnett FCA, combining the technical rigour of a Big Four background with a decade of hands-on operational and Finance Director experience.
Prior to founding the practice, Damien spent 14 years in public practice - including four years as a Senior Manager with Deloitte in the City of London, advising clients of all sizes. He then spent 10 years running businesses directly, including serving as Finance Director for a medium-sized multinational group.
Based in Eden Street, Kingston upon Thames, we serve a growing portfolio of SMEs across West London and Surrey. We are authorised by the ICAEW and maintain a specialist network of advisors in IT, Legal and HR.
🛡️ The Harnett & Co Guarantee
We guarantee superior financial expertise combined with outstanding client service, clear proposals with no hidden costs, personal management by Damien Harnett, and strict confidentiality at all times.
Senior financial leadership - without the full-time cost
Many ambitious SMEs need the strategic insight of a Finance Director but cannot justify a full-time appointment. Harnett & Co bridges precisely that gap - flexible, expert FD support on your terms.
Business Analysis & Benchmarking
Measure performance and identify profit improvement opportunities.
Strategic & Financial Planning
3–5 year financial plans aligned to your growth ambitions.
M&A Advisory
Buying or selling businesses in a tax-efficient manner.
Risk Reviews
Identifying financial vulnerabilities to protect trading margins.
Financial Systems Evaluation
Ensuring your systems drive rather than hinder performance.
Revenue Maximisation
Pricing strategy and margin improvement advisory.
Forensic Accounting
Investigations and expert reports for disputes or fraud matters.
Non-Executive Director
Board-level governance and oversight to accelerate growth.
Expert tax planning & guidance for individuals
Whether self-employed, a company director, or managing personal wealth - we provide expert, tailored advice to maximise your tax efficiency and safeguard your financial future.
Self Assessment & Personal Tax Planning
We prepare and submit your self assessment return, advising on all available allowances. We act as your HMRC agent and manage any enquiry on your behalf.
Estate Planning & Inheritance Tax
We help you use available exemptions and reliefs on lifetime transfers to reduce inheritance tax liabilities and preserve wealth for your beneficiaries.
Retirement Strategies & Pension Planning
Advice on pension structures, timing, investment mix and transition strategies to ensure a financially secure and confident retirement.
Trusts & Executorships
Advice on the right trust structure, formation and ongoing accounting to minimise tax and protect family wealth across generations.
Property & Landlord Tax
Comprehensive tax advice for landlords, buy-to-let investors and property developers - from rental income to CGT on disposal.
Expertise across a wide range of industries
Our client base spans a diverse range of sectors. Whatever your industry, we bring relevant expertise and genuine understanding to your accountancy needs.
Legal & Professional Services
Solicitors, barristers, consultancies and regulated professional services firms.
Technology & IT
Software developers, IT consultancies, SaaS businesses and tech start-ups.
Healthcare & Medical
GPs, dental practices, care providers and private healthcare businesses.
Construction & Property
Developers, contractors and property investors including CIS management.
Retail & E-Commerce
Online and high street retailers, marketplace sellers and consumer brands.
Hospitality & Leisure
Restaurants, hotels, gyms and entertainment businesses across West London.
Education & Training
Independent schools, tutoring businesses, training providers and academies.
Media & Creative
Advertising agencies, production companies, designers and creative professionals.
A straightforward, structured approach
Initial Consultation
A detailed discussion to understand your business, goals and current financial arrangements.
Tailored Proposal
A clear, fixed-fee proposal with no hidden costs - outlining exactly the services we recommend.
Seamless Onboarding
We handle the transition from your previous accountant and ensure nothing falls through the cracks.
Ongoing Partnership
Proactive, year-round support - not just at compliance time - keeping your finances in order.
What our clients say about us
We measure our success through the results we deliver. A selection of feedback from businesses we are proud to have supported.
"We could not have turned our business around without them. Damien's commercial acumen throughout a major business downturn was truly invaluable. We are now in a strong position to grow."
"Six months after moving to Harnett Accountants they had already identified significant savings overlooked by our previous advisors. They have effectively paid for themselves already."
"Not only reliable, efficient and great value - they provide sound business advice and have been instrumental in improving our overall profitability. Highly recommended."
"Working with Harnett Accountants has allowed my business to grow. They are an excellent accountancy firm - well-informed, highly professional and genuinely recommendable."
"Damien and his team are so professional and efficient - I cannot thank them enough for all their help and advice with my business. It is a genuine pleasure to work with them."
"HARNETT always maximised my income through their excellent knowledge and experience. Excellent service with no jargon - one always feels respected and in control."
Speak to us about your requirements
Whether you are seeking a new accountant, specialist tax advice, or exploring our Finance Director services - we would be pleased to discuss how we can help.
Send an Enquiry
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