Simon Maughan & Co
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Your trusted Oxfordshire accounting partners
Simon Maughan & Co
Operating as ICAEW chartered accountants in Oxford, we provide a comprehensive range of accounting, tax and advisory services designed to bring clarity to financial decision-making. Our role is to support clients with clear, strategic advice, ensuring they understand both their obligations and their opportunities. Whether clients are building a business or managing their own financial affairs, we aim to offer guidance that is transparent, reliable and shaped around their long-term objectives. Our approach is centred on communication and personal attention, allowing us to deliver service that adapts to each clients goals.

Our support includes forming companies, advising on legal structures and addressing early-stage tax considerations. We manage corporation tax returns and provide VAT and employer tax services, helping businesses maintain compliance while identifying potential efficiencies. For individuals, we assist with self-assessment, capital gains and inheritance tax, particularly during periods of change. We also provide cloud-based accounting solutions to streamline administrative tasks and deliver real-time financial insights. Our business and CFO advisory services help organisations assess performance and plan for growth, and we complete year-end accounts promptly and accurately. Serving clients locally and across the UK, we combine extensive experience with a flexible, modern approach to collaboration.
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 assist businesses in navigating all aspects of accounting and taxation. Our services include VAT and corporation tax management, payroll setup, year-end accounts, management accounts, and cloud-based accounting solutions. Company formation and registered office provisions are offered alongside advisory services, enabling you to make informed financial decisions while staying compliant with all regulatory requirements.
Personal Tax Our personal tax service provides expert guidance for individuals seeking to optimise their tax affairs while remaining fully compliant with HMRC regulations. We assist with self-assessment returns, self-employment income, capital gains, inheritance planning, land and property taxation, and investment income. Our team ensures all opportunities for legitimate tax savings are identified and maximised, giving you confidence in your financial decisions.
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.
Kam Antony
Kam Antony
Apr 02, 2025
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Simon's friendly and laid back demeanour, belies the immense skill and professionalism that he and his associates have. We were let down badly by a previous accountant and were up against it to hit certain deadlines. Simon understood the issues immediately and his swift action and advice was impressive and saved us a lot of time and money. can't recommend him any higher.... wish there was a sixth star on here.