Welcome to Sinclair McKinsley
A Growing Accountancy Firm
Dedicated to Your Success
We are a team of expert accountants, tax consultants and business advisors based in Harrow, London. With over 20 years of experience, we offer comprehensive accounting, taxation and financial planning solutions to businesses and individuals across the UK.
Whether you're a start-up, an established business or a property investor — we work closely with you to develop personalised strategies that drive growth and prosperity.
"You Grow, We Grow"
— Our Mission
Discover Our Story
What Sets Us Apart
Stress Free
Friendly and approachable — you can talk to us about anything without feeling overwhelmed.
Helpful & Informative
Jargon-free advice with a dedicated manager to guide you every step of the way.
Saving You Money
We research every solution to ensure every penny you can save, you do save.
Making You Money
Growth focused and forward thinking — we help you achieve your personal and business goals.
Our Services
Everything You Need,
Under One Roof
From day-to-day bookkeeping to complex international tax — our dedicated team handles it all with precision and care.
Professional Accounting
Accurate and reliable accounting solutions to streamline your financial management and drive business success.
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Personal Tax & Financial Planning
Personalised wealth management, financial planning and strategic tax guidance for private clients.
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Inheritance Tax & Estate Planning
Protect your assets, honour your wishes and secure your loved ones' financial future with expert estate planning.
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VAT Returns & HMRC Filing
Hassle-free VAT preparation and filing ensuring accurate reporting and full HMRC compliance at all times.
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Payroll Services
Accurate and timely payroll management fully compliant with UK employment law and HMRC obligations.
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Overseas Income & Foreign Companies
Expert guidance on overseas income reporting, foreign company structures and international tax compliance.
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Need something specific? We offer 9 services in total across all sectors.
View All ServicesWhy Choose Us
The Sinclair McKinsley Difference
We don't just manage your numbers — we become your trusted financial partner, fully committed to your growth at every step of the way.
"
You Grow, We Grow
Our mission — your goals are our goals, always.
01 — Peace of Mind
Stress-Free Experience
Friendly and approachable — a dedicated Customer Services Manager guides you every step of the way, keeping everything simple and jargon-free.
100%
Client Satisfaction
02 — Transparency
No Surprise Bills — Ever
Complete transparency on all fees. You will always know exactly what you are paying before we begin — honest, upfront, no hidden charges.
£0
Hidden Costs
03 — Financial Growth
We Save & Make You Money
We research every solution to make sure every penny you can save, you do — growth focused strategies to achieve all your personal and business goals.
20+
Years Expertise
04 — Commitment
Always Exceeding Expectations
We listen, communicate quickly and always go above and beyond. Your success is our success — we treat every client like our only client, every time.
500+
Happy Clients
Industries We Serve
Sector-Specific Expertise
Across 9 Industries
Each industry has its own unique financial challenges and regulations. We understand yours — delivering tailored advice and solutions that are specific to your sector, not generic.
Manufacturing & Distribution
Export, R&D, supply chain finance
Construction
Cash flow, margins, project finance
Real Estate & Property
Tax optimisation, portfolio structuring
Healthcare
Regulatory compliance, resource planning
Technology
R&D credits, startup advisory
Retail & Wholesale
Buying habits, stock, VAT management
Hospitality & Entertainment
Leisure, events, business advisory
Charities & Non-Profit
Specialist charity accounting & reporting
Professional & Technical
Scientific, legal & technical sectors
Don't see your industry? We can still help.
Our expertise spans many more sectors — get in touch and let's discuss your specific needs.
Client Testimonials
What Our Clients
Say About Us
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