MSU Advisory Limited

MSU Advisory Limited is an independent firm of Chartered Certified Accountants based in Stone Cross, East Sussex, providing accountancy, taxation and strategic business advisory services to clients across the UK. The firm works with owner-managed businesses, entrepreneurs, family investment companies and private clients, combining traditional accountancy services with commercially focused advice designed to help clients understand their finances and make informed business decisions.

Services include business accounting and compliance, tax planning and advisory, business advisory services, outsourced Finance Director and CFO support, management reporting, cash flow forecasting and remuneration planning. MSU Advisory also helps businesses improve their finance functions through cloud accounting, automation, dashboards and AI-assisted workflows, providing business owners with clearer financial information and greater visibility over performance.

Founded by Mark Underdown FCCA, MSU Advisory is built on more than 20 years of professional practice experience, including over a decade of leadership as a director within an established chartered accountancy firm. The practice focuses on developing long-term advisory relationships, giving clients direct access to senior expertise and practical guidance that extends beyond annual accounts and tax compliance.

Monday: 09:00 – 17:00
Tuesday: 09:00 – 17:00
Wednesday: 09:00 – 17:00
Thursday: 09:00 – 17:00
Friday: 09:00 – 17:00
Saturday: Closed
Sunday: Closed