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About us

Since 1995, we’ve been providing A1 accountancy services to our clients, steered by our watertight values and principles.



With three comprehensive packages and a number of add-ons, we can equip you with everything you need to help you ride the waves of contracting.



Whatever you’re searching for, our scope of industry knowledge and resources can help.

Vantage – Online Accountancy Software


The dashboard provides you with an instant real-time financial picture of your business which can be viewed down to the level of each transaction making up a balance.

Cloud Based

Our cloud based platform gives you 24/7 access to your finances at your fingertips – at any time, and from anywhere in the world with an internet connection.


Vantage has been designed specifically for contractors with little to no accountancy knowledge, it is free of any jargon and the clear intuitive layout makes it easy to use for a novice.


IR35 Compliant

Irrespective of whether you are caught or exempt from IR35, you can use Vantage.


Create professional invoices in a few simple clicks.


SSL encryption and remote data backup to ensure that your information remains completely safe at all times.


Trial Vantage for free

To get the process started, just fill out the form below and we’ll be in touch.

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One of our main focuses is consistently exceeding expectations. We work hard to achieve this, and we’re honoured our clients agree by rating us as one of the Top 5 Rated Accounting Firms on Trustpilot.

See our 709 reviews on Trustpilot

Very efficient and professional services

Very efficient, timely and professional services from all concerned with regards to all aspects.

9th August, 2021

First and Last Accountant!

This is the first accountant I have used and will never change. I pay for the top package and definitely worth it. They help you with all sorts of enquiries which I had no clue about, where it is business, mortgage or anything else, they can support. Katie Murray and her team were extremely helpful.

22nd July, 2021

Nixon Williams simply THE BEST!

Nixon Williams has been doing my company’s account since 2008 and I cannot recommend them highly enough. The service they have provided me with, has been second to none from day one. They are always willing to help you with any queries you may have.
I especially want to thank Anne-Marie Haslem for her service all these years. She has been a star! Thank you. All the best, Miguel.

13th July, 2021

Extremely easy process and friendly…

Extremely easy process and friendly staff to help with all aspects of new client setup.

8th July, 2021

Excellent Service

My company has been using the services of Nixon Williams for around 3 years, and in that time we’ve always received first class service from our accountant Anne-Marie. The various returns are always correct and on time. If we need any information, it’s always easy to speak with Anne-Marie via phone or email, and we always get sound advice from a professional who knows their industry inside out.

28th June, 2021

Nixon William – Excellent Service and Thank you

I’ve used Nixon Williams for a couple of years now, during this time their advice and guidance has been excellent, especially for someone like myself that is not very clued up on Taxes/Accounts etc. The Vantage Portal is easy to use and provides a good overview of the real-time account status, which is one of the reasons I joined them in the first instance.

14th June, 2021