We turn financial confusion into confident decisions.
Clear advice. Smarter decisions.
Better results.
We're an independent chartered accountancy practice based in Oxford, serving clients across Oxfordshire and the wider South East. We're small enough to know every client personally, with twenty years of experience in complex tax and accounting work for limited companies, growing businesses and private clients.
Simon has been a huge help to our business since its formation in 2017. He is knowledgeable, friendly, and always quick to respond. He comes with the highest recommendations.
Simon has been an invaluable help at Inner Citadel, always making our accounting processes smooth and stress-free. He takes the time to explain everything clearly, ensuring we fully understand our finances.
Simon M. Antonis, FCA is the founder of Simon Maughan & Co. He began his career at KPMG and has spent two decades helping businesses of all sizes make sense of their finances, from personal tax returns to limited company accounts and complex financial structures. He is a Fellow of the Institute of Chartered Accountants in England and Wales, the most senior designation ICAEW awards. If you become a client, that experience is what you get, directly.
Starting a business is exciting — but picking a name is the easy part. The real decisions are structure (sole trader or limited company) and getting your limited company set-up right from day one. We help clients with:
Business taxes can be tricky, but we make them simple. We handle corporation tax, VAT and employer taxes for limited companies, and make sure you're not missing reliefs.
Life transitions call for smart tax planning, whether you're receiving an inheritance, investing, trading, or changing careers. We help you stay compliant and keep more of what's yours.
Keeping track of finances doesn't have to be a hassle. Your transactions are categorised automatically and your reports stay real-time.
Whether you're a start-up, scale-up or established business, we give you strategic financial guidance without the cost of a full-time CFO.
We prepare your year-end accounts accurately and on time, keeping you compliant with HMRC and Companies House.
Oxford, Oxfordshire & across the UK
Designed with small businesses and limited companies in mind. From company formation, payroll and compliance through to growth planning.
Oxford, Oxfordshire & across the UK
Expert support for contractors, freelancers and consultants. Set up a limited company, navigate IR35 regulations and optimise your tax efficiency.
Call or email us to book a discovery call, arrange an in-person meeting in Oxford, or request a fixed-fee quote for the service you need.
Contact us