About us

Cox Costello & Horne is a leading regional accountancy firm of chartered accountants and chartered tax advisors.

We offer a wide range of advisory services that are designed to make your business and personal tax return more tax-efficient in the short, medium and long term – our services range from strategic accountancy planning to pragmatic advice on personal tax returns.

Cox Costello & Horne prides itself on becoming an integral part of its clients’ business to ensure they operate a best-practice accounting approach, which serves to optimise business performance and maximise profit.

Founded in Rickmansworth in 1997 by Mike Cox and Dermot Costello, our Leeds office opened in 2013 and London in 2014, we now have a team of professionals operating from three offices.

Cox Costello & Horne invests continually in its own team to ensure a highly- motivated and highly-qualified workforce, and we adopt the latest accountancy software and tools to help us deliver an excellent service to all our clients, regardless of their size or turnover. Our advice and support goes beyond pure accountancy and we provide strategic financial advice to all our clients on a business and personal level.

We are regulated by the Institute of Chartered Accountants in England and Wales in relation to our obligations under the Money Laundering Regulations 2007 and must undertake those checks that we deem necessary to satisfy ourselves as to our clients' identity and, if relevant, the source of their funds. Additionally Cox Costello South, based in Rickmansworth, is registered as a firm of Chartered Tax Advisers and is therefore subject to regulation by the Chartered Institute of Taxation.

Cox Costello & Horne Limited acts as agent on behalf of all individual companies within the Cox Costello network.