About T4

T4 Tax Limited are Chartered Tax Advisers (CIOT) & an Independent Certified Practising Accountant (ICPA).

With 30+ Years of experience we have a wealth of experience in helping clients with tax and accounting issues.

We offer a full range of bookkeeping, accounts and tax related services for sole traders through to companies with £Million+ turnovers.

ICPA Logo Red on White

T4 - A Brief History

2019 Our 30th Anniversary

Originally founded in 1989 – 2019 sees our 30th Anniversary

T4 A Brief History

Established 30 Years

T4 started out as the Thames Valley Tax Practice in 1989.

Our first client, Jason a carpenter is still a valued client today.

Jason recommend Rob a carpenter and builder. Rob and his co-director Clive run a successful building company, are still valued clients today and also now one of our biggest clients.

In 2004 we incorporated as T4 Tax Limited.

After 30 years we have a wealth of tax and accounting experience at our clients disposal and a flourishing accounting and tax practice.


Established Over 30 Years

30 Years of Accounting & Tax Experience

For the Benefit of Our Clients...

QuickBooks Specialists for 20+ Years


Independent Certified Practicing Accountant (ICPA)

Certified Advanced QuickBooks Online ProAdvisors

Chartered Tax Advisers (CIOT)

The T4 Team

 We offer our clients a full tax and accounting service including cloud accounting with QuickBooks Online.

Bookkeeping, payroll, vat returns, CIS returns and admin, workplace pension administration for employers are core aspects of our services.

Tax compliance, Self Assessment tax returns and administration are also core services.

The T4 team is now four strong.  John, Julie, Katie and Tracy who help clients through the minefield of tax compliance and accounts.

4 Team Members

Over 98% of our clients come from personal recommendation which speaks for itself. 

John Cotter CTA ATT ICPA

Hi, I ‘m John and I founded T4 in its original form as “The Thames Valley Tax Practice” in February 1989.

 I am a Chartered Tax Adviser (CTA), Member of the Association of Taxation Technicians (ATT), and an Independent Certified Practising Accountant (ICPA).

We have since incorporated as T4 Tax Limited in 2004.

I qualified as a member of the Association of Taxation Technicians in 1989 and then also in what is now known at the “Chartered Institute of Taxation” in 1990.

Over the last 30 years I have dealt with a very wide range of tax and accounting issues for both small businesses and  medium size businesses.

I have a wide range of experience in dealing with  people from all walks of life from the rich & famous to the rest of us mere morals. 

My goal is to treat everyone equally and give practical, efficient & effective advice to all my clients.

My goal for us here at T4 is that we all work hard and diligently to help our clients thrive. Whether you are starting out at 18 or retiring we are here to help.


30+ Years - 200 Clients - T4 Team of 4

Small Firm - Big Services - Friendly Experienced Team

Almost 200 Clients

At T4 Tax Limited we have almost 200 clients and we grow year on year.

We treat every client with the same personal level of focus, help and support from small clients to large clients, existing ones and new clients.

Some of our clients have been with T4 for over 30 years and many since the day they first went into business.

We have grown significantly in the last few years.



Almost 98% Purely on Recommendation

When you have a growing business and when most of your clients come from an existing client personal recommendation, you know you must be doing something right

However we are never complacent.

We are always striving to be even better at what we do and the way we do it.

Our goal is to help our clients thrive.

30+ Years of Tax & Accounting Experience

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