Oxford accountants, tax and financial advisors
We turn financial confusion into confident decisions. Expert accounting and tax advice for individuals and businesses.
Clear advice.
Smarter decisions.
Better results.
Focused on your financial future
We're an independent Oxford chartered accountancy practice — not a national firm, not a franchise. Small enough to know every client personally, with twenty years of experience in complex tax and accounting work.
What our clients say
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.
Meet the founder
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 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.
Your local Oxford accountant
Our practice in North Oxford, between Jericho and Summertown. We're independent and local, working with clients across Oxfordshire and nationally. Happy to meet at our Oxford practice, visit you at your premises, or work together remotely, whatever suits you best.
Whether you are looking for a personal tax advisor or a business accountant, we can provide a personalised service backed by real local expertise.
Services we offer
Company formation
Starting your own business is exciting. There is a lot to think about. Besides the more fun things like picking the right name, you'll also need to consider the right legal structure (sole trader, limited company, etc.) and understand your accounting and tax obligations. We're here to help with any questions, as well as planning for growth.
Set up your company
Corporation tax, VAT & employer tax services
Navigating business taxes can be tricky, but we're here to simplify the process. We handle corporation tax returns, VAT and employer taxes, keeping you accurate and compliant. We'll also help you unlock the right reliefs, from capital allowances to identifying whether you qualify for R&D tax relief, so nothing that could reduce your bill gets missed.
More about business tax
Personal tax planning and advice
Life transitions require smart tax planning. Whether you're receiving an inheritance, investing, trading, changing careers, or approaching retirement, we’re here to help. Our services cover self-assessment tax returns, ensuring HMRC compliance while minimising your tax liability. We also assist with managing capital gains and inheritance tax.
More about personal tax
Cloud accounting
Keeping track of finances can be challenging. Cloud accounting gives you 24/7 access to your company's financial data from any device, with complete security. We work with Xero, QuickBooks, FreeAgent and others, setting them up so transactions are categorised automatically, reports stay real-time, and you remain compliant with Making Tax Digital.
More about cloud accounting
Business and CFO advisory services
Whether you're a start-up, a scale-up or an established business, we provide strategic financial guidance without the cost of a full-time CFO. For founders, that means the decisions that are expensive to undo: co-founder share structure, SEIS/EIS and EMI options, spin-out and IP planning, and getting investment-ready. For growing businesses, it's analysing your numbers and spotting growth opportunities.
More about CFO advisory
Year-end accounts
We'll prepare your year-end accounts accurately and on time, keeping you compliant with HMRC and Companies House. You get dependable, expert support, leaving you free to focus on growing your business. We'll also prepare and file your corporation tax return alongside your accounts, so both are completed and submitted together.
More about year-end accountsSmall business accounting and tax services
Designed with small businesses in mind. From company formation, payroll and compliance through to growth planning.
View small business accounting servicesAccountant for contractors and consultants
Expert support for contractors, freelancers and consultants. Set up a limited company, navigate IR35 regulations and optimise your tax efficiency.
View contractor accounting servicesGet in touch
Book a discovery call to talk through how we can help with personal tax or business accounting.
Contact us