Chartered Accountants

London EC1, Reading & Dublin

– Exceptional client service – see our testimonials and reviews

– Genuine fixed fees – so you can budget effectively

– Wide variety of added value services including Audits, EMI Share Schemes, Corporate Finance and Business Valuations

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Carbon Accountancy

Looking for a trusted London, Reading or Dublin accountancy firm that offers more than just number-crunching?

At Carbon Accountancy we pride ourselves on building lasting, personal relationships with every client — from fast-moving startups and growing SMEs to international corporations. In fact, there isn’t a single client our Founder and CEO John Leyden hasn’t spoken to personally, and many have been with us for years. Based in London, with offices in Reading and Dublin, we serve clients across the UK and internationally, offering a consistent, high-quality service thanks to our exceptional staff retention.

What sets us apart?

Exceptional client service – consistently praised in our testimonials and reviews
Genuine fixed fees – so you can plan with confidence and avoid surprises
Deep sector experience – across industries, business types and sizes
Wide-ranging services – including audits, EMI share schemes, business valuations, and corporate finance
Strong, long-term client relationships – built on trust and a personal approach
UK reach, local feel – offices in London, Reading and Dublin

If you’re looking for an accountancy firm that combines technical excellence with a human touch, we’d love to hear from you.

Key Services

Company accounts

Looking for a reliable accountant in London or Reading for your company accounts? Whether you’re a startup, growing SME, or long-established limited company, we provide expert, hassle-free support tailored to your business, whatever your sector.

Business Audits

If you’re a large, medium-sized or small business that needs an audit – not because you want one, but because statutory limits regulations, your bank, or shareholders require it – we’re here to make it easier, faster, and better value.

Listed Companies, International Groups & UK Subsidiaries

Looking for a trusted UK accountant for your international subsidiary, group company, or UK start-up? We specialise in helping listed companies, overseas groups and UK subsidiaries manage their UK financial obligations smoothly and efficiently.

Business Tax services

Navigating UK tax can be tricky — but it doesn’t have to be. As specialist tax accountants based in London and Reading, we make complex tax issues simple and straightforward for your business or as an individual.

Book Keeping

Looking for a reliable and professional accountant for bookkeeping in London? Whether you’re a growing start-up or a well-established SME, we offer cost-effective bookkeeping and company accounts services that help you stay on top of your finances — without the stress. At Carbon Accountancy, we understand that many small businesses either don’t have the internal resources to manage bookkeeping in-house or would simply prefer to outsource this time-consuming task to professionals. That’s where we come in. We provide efficient, accurate and compliant bookkeeping solutions designed to suit the unique needs of your business.

Self Assessment Tax Returns

Completing a Self Assessment Tax Return can be time-consuming and stressful — but it doesn’t have to be. Our experienced team handles the entire process for you, ensuring your return is accurate, compliant, and submitted to HMRC on time. We’ll help you make the most of available allowances and reliefs, minimise your tax liability where possible, and give you peace of mind knowing everything is handled professionally and efficiently.

Testimonials

Bette Bondo

Carbon Accountancy was recommended to me by a friend, and I used it over a period of 12 years in which I was self-employed, employed, rented out a property, and later sold a property - being first a UK resident and later living abroad. I always received friendly, accurate, precise, and professional service from John and his team. The services were very fairly priced, and I recommended Carbon to other of my friends, who still use the agency today.

Adam Silton

I looked around very hard and interviewed to find a good accountant. It's very hard to find a good one in London, so many overcharge and often do work that misses out details and all the other important things. I also liked that they have genuine experience and good advice, which is really useful in my business. There are a good safe pair of hands and I'm very pleased to be with them.

Lee Stafford

I have been working with Carbon Accountancy for over a decade, they have taken care of my accounts, bookkeeping, disputes, acquisitions and every aspect of my finances. Carbon are a brilliant company, they give amazing advice, their attention to detail is second to none and I cannot recommend them enough. Thank you John and the team 🙏

WZN Consulting Ltd

We have been with Carbon Accountancy a number of years and have always found them pro-active and effective. The whole team is friendly and helpful!

Fergus Rugg-Gunn

Carbon Accountancy have provided both personal and company accounting services for a number of years and they are always really responsive and extremely helpful. They have offered advice on a number of occasions which has been spot-on each time. Highly recommend.

Valentine Bancroft

I have been with Carbon Accountancy since 2009 and cannot recommend them highly enough: on the ball, efficient and friendly and always have an answer to my extend/ & international tax affairs!

John Gordon

What a brilliant service. Fast, accurate and extremely impressive.

Ramsay Kerr

Carbon have been my accountants for over 10 years. They always go above and beyond to deliver an excellent service, and are very patient in working through all the intricacies of both our business accounts, and also my personal filings. John, Gaurav, Beata and the team are all excellent to work with. I'm very happy to recommend them.

Brian Davies

A very professional group and always pleasant to deal with.. A great service who reply promptly and are very helpful. Dr Brian Davies, Director, Signature Robot Ltd.

Lauren Kiley

I have worked with Carbon for about 3 years now for our business accounting. They have always provided reliable, efficient and friendly service. Highly recommend.

We have been using Carbon for years, they always provide a great service when dealing with all aspects of our accountancy and finance. John, Gaurav and the team are fantastic, always helpful, friendly and respond promptly. An excellent accountancy company.

Debbie Whelan

Google

Have worked with Carbon for a number of years now and they are a fantastic accountancy firm. Always able to assist with useful information and have been invaluable in helping our growth. Gaurav has been amazingly patient and kind, John always available with great insights and advice and Ann consistently efficient. As a SME- they have been an excellent firm to work with.

Alex Siegel

Google

Ramsay Kerr

Google

Fergus Rugg-Gunn

Google

Latest Resources

Spring Statement Summary, March 3rd 2026

Download3 MB

2025 ICAEW Diversity Report

Download150 KB

Starting and Selling a Business April 2026 Update

Download6 MB

Investing Tax-Efficiently April 2026 Update

Download3 MB

Services

Contact Us

Chartered Accountants

London EC1, Reading & Dublin

– Exceptional client service – see our testimonials and reviews

– Genuine fixed fees – so you can budget effectively

– Wide variety of added value services including Audits, EMI Share Schemes, Corporate Finance and Business Valuations

Request a call back

Carbon Accountancy

Looking for a trusted London, Reading or Dublin accountancy firm that offers more than just number-crunching?

What sets us apart?

Key Services

Company accounts

Business Audits

Listed Companies, International Groups & UK Subsidiaries

Business Tax services

Book Keeping

Self Assessment Tax Returns

Testimonials

Latest Resources

Spring Statement Summary, March 3rd 2026

2025 ICAEW Diversity Report

Starting and Selling a Business April 2026 Update

Investing Tax-Efficiently April 2026 Update

Services

Sectors

Business Types

About

London

Reading

Dublin