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Over 10 Years of Experience within Accounting Business Services


Professional accounting, taxation, and financial guidance for small and large businesses.

We have over a decade's worth of experience in providing professional accounting services and tax planning solutions to individuals and organisations across all business sectors. Our commitment to you is that "We Grow When You Grow". We believe in building relationships with our clients and supporting them with everything they need. 

Filling Out Tax Form
Analyzing Data

About Us

Established in 2012 with the mission to provide high-quality professional accounting, taxation, and business advisory services to businesses and individuals with an aim of working closely with clients and to act for a broad range of business and personal relationships.

We pride ourselves on our commitment to our clients through professionalism and dedication, we can exceed our client’s expectations in every aspect of business and finance, both efficiently and cost-effectively.

Why choose us

Dedicated accountant


Our clients will receive one to one, hand-holding support every step of the way for their business growth and high-quality service which is central to everything we do. You will have a single point of contact that knows you and your business who can help you with all of your accounting needs.

Accredited accountant


Our client managers are fully qualified and accredited by our accounting software providers: Xero, Quickbooks and FreeAgent. So, you can relax as you are in very good hands.

ACCA registered


Our skilled and dedicated team provide expert business advice and we are members of The Association of Certified Chartered Accountants in England and Wales (ACCA).



All of our fees are pre agreed and inclusive with no hidden costs. All of your and your companies information is available to you 24/7 on our clients portal.

Forward thinking


We love bringing clients the most up-to-date technology and tools that will help them automate and streamline procedures, supercharge cash flow, and become more efficient through focused tax planning processes.

Value add service


We are always looking to improve our accountancy service to boost your financials. This includes an accounting portal with login for all clients with access to data 24/7.

Our accounting software partners
that will grow your business







Filling Out Tax Form

Speak to one of our
specialist accountants today!

Discover how our strong team can help your small business streamline its processes and reduce accounting work by calling your local Banbury accountancy firm today!

Why our clients love I Sumar & Co

John Williams

“As well as handling all the usual accounting jobs, they identify the issues behind the issues and have been great at “hand-holding” which is essential to any new business.”


Sole Trader

You will be the exclusive owner of a business, entitled to keep all profits after tax has been paid but liable for all losses.


Limited Companies

A private company whose owners are legally responsible for its debts only to the extent of the amount of capital they invested.



Two or more owners of a business, entitled to keep all profits after tax has been paid but liable for all losses.


Limited Liability Partnerships – LLPs

This is a hybrid between a partnership and a limited company formed under the Limited Liability Partnerships Act 2000, and regulations made under that Act.



A person or firm that undertakes a contract to provide materials or labour to perform a service or do a job.


Other Services

To get the range of services provided for individuals and businesses.

Please visit Our Services page.

Cloud Accounting

I Sumar & Co is a fully cloud-based accounting practice. We have been working tirelessly to provide the best-innovated services to our clients and we are proud of it. We know every business has its own individual needs and so our tailored solutions will give you as much or as little support as you require.

Our Expertise

We will help you register with HMRC and other relevant legal bodies while you carry on with your day to day business. We will support you to grow your business with a dedicated point of contact.


Bookkeeping software

QuickBooks Online is used by millions of businesses around the world and is the UK leading bookkeeping software. We will train you to do the basics and take care of all your entries which needs to be reviewed to ensure they are accurately posted.


Unlimited expert advice

We will complete your accounts and tax returns and submit them to HM Revenue and Customs and Companies House without any extra cost to you.

Filing included

We will complete your accounts and tax returns and submit them to HM Revenue and Customs and Companies House without any extra cost to you.


Automated Deadline Reminders

We will give you access to all your data and live deadlines for all your services helping to ensure never to miss deadlines.

Tax Planning and reviews

We will discuss with you from time to time when the regulations change on how to efficiently save taxes for you and your businesses.

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