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 Clear Background

T4 - A Brief History

T4 - A Brief Services Overview

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. Rob, and his co-director Clive run a very successful building company. Now one of our biggest clients.

Rob then recommended...

We don't advertise as 98% of our clients come from an existing client recommendation.

In 2004 we incorporated as T4 Tax Limited.

After 30+ years we have a wealth of tax and accounting experience at our client's 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

Years +

Independent Certified Practicing Accountant (ICPA)

Certified Advanced QuickBooks Online ProAdvisors

Chartered Tax Advisers (CIOT)

The T4 Team

The T4 team strive to provide a professional, friendly, and efficient service to all our clients.

 John, Julie, Katie, and Tracy help our clients through the minefield of tax compliance and accounts.

Team Members

T4 Services

All business owners like to say that their business is unique and better than the competition.

At T4 we make great efforts to actually be unique, better, and more efficient in all aspects of the services we provide. 

We are constantly review and introduce improvements to our services, the latest technology and other aspects of our business to ensure our services are up to date, practical and efficient in the way that they are delivered to and for the benefit of our clients. 

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

Why Quickbooks Online? Well, again, we constantly keep other options such as Xero and FreeAgent under review to ensure we are recommending top class, best solutions. We still think that Quickbooks Online is the most flexibly, adaptable and efficient cloud accounting solution and using it we can help our clients save, time, costs and increased efficiency. Especially with MTD (Making Tax Digital) coming!

Plus we can supply Quickbooks are discounted prices saving our clients money.


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


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

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.

In 2004 we incorporated as T4 Tax Limited.

Over the last 30+ years I have dealt with a very wide range of tax, accounting and business issues for small, medium and large businesses.

Our speciality is  small and medium size businesses with turnovers up to around £5Million.

I have dealt with people from all walks of life over the years, from the rich & famous, to the rest of us morals.

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

My constant goal for T4 is to be “best in class” and “ahead of the rest”. We work hard and diligently to achieve that goal.

For current new client service availability see our clients page.

30+ Years - 200 Clients - T4 Team of 4

Small Firm - Big Services - Friendly Experienced Team

Approx. 200 Valued Clients

At T4 Tax Limited we have around 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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