Simon Maughan & Co
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Your trusted Oxfordshire accounting partners
Simon Maughan & Co
As chartered accountants based in Oxford, we provide accounting, tax and financial advisory services designed to turn uncertainty into clarity. Our aim is to give individuals and businesses the confidence to make well-founded financial decisions through clear communication and sound technical expertise. Whether clients are managing personal tax matters or steering a growing company, we offer guidance that supports informed decisions and long-term financial goals. We take pride in delivering a personalised service, shaped around each client's circumstances and ambitions.

Our services cover company formation, corporation tax, VAT and employer tax compliance, as well as personal tax planning across life changes such as investment, inheritance or retirement. We offer cloud-based accounting solutions, giving secure, real-time access to financial information, and our business advisory support provides strategic insight without the need for a full-time CFO. For year-end accounts, we ensure timely and accurate preparation to maintain compliance with HMRC and Companies House. We work with small businesses, contractors and consultants across Oxfordshire and the UK, offering both in-person and remote collaboration. With more than two decades of experience, including a background at KPMG, we continue to provide dependable, expert guidance tailored to every clients needs.
Served areas
  • Oxford, Summertown, Jericho, Oxfordshire, Marston, Woodstock, Wolvercote, Banbury, Kidlington, Witney, Abingdon, Wallingford, Thame, Faringdon
Details
  • Year established: 2008
  • Employees: 3
  • Licensed
  • Insured
Highlights and features
  • Year end accounts
  • Corporation tax
  • Company formation
  • Self assessment tax returns
  • Part time Finance Director
Associations and certifications
  • Institute of Chartered Accountants in England and Wales (ICAEW)
Payment methods
  • Cash, Debit cards, Credit cards, Mobile payments, Bank transfers
Services
Business accounting and tax We provide comprehensive support for businesses of all types, whether limited companies, LLPs, or other structures. Our services cover year-end accounts, corporation tax, VAT, payroll management, cloud accounting systems, CFO advisory, and management accounts. We also offer company formation, administration, and compliance solutions to help you operate efficiently and remain fully compliant.
Personal Tax We offer comprehensive personal tax support to individuals, covering self-assessment submissions, self-employment reporting, VAT returns, and capital gains considerations. Our services also extend to inheritance tax planning, property taxation, and investment income management. By applying detailed knowledge of HMRC rules, we help you reduce liabilities where legally possible while maintaining accuracy and clarity in all filings.
People
Simon M. Antonis
Simon M. Antonis
Founder and Director, FCA
Simon's love of numbers and helping people has shaped his 20-year career in finance. After qualifying as a chartered accountant in 2007, he worked with KPMG in Edinburgh, gaining experience with businesses of all shapes and sizes. Today, he is a Fellow of The Institute of Chartered Accountants in England & Wales (ICAEW) - the most senior status awarded by ICAEW, bringing deep expertise to his work.

Simon uses his skills to help businesses and individuals make sense of their finances, offering clear advice that cuts through complexity. He also serves as a board member, where he plays a key role in designing financial structures for clients, ensuring both compliance and efficiency.
Reviews (2)
Alberto S.
Alberto S.
Nov 20, 2025
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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.
Dr. Scott T.
Dr. Scott T.
May 25, 2024
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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.