Paul was a co-founder of the Fair Tax Foundation in 2014, and became Chief Executive in September 2017. International Tax Review named him among its ‘Global Tax 50' of influencers in 2022 and 2025.

The Fair Tax Foundation believes that companies paying tax responsibly should be recognised and celebrated, and any global race to the bottom on tax competition should be resisted. The Fair Tax Mark accreditation scheme is the gold standard of responsible tax conduct. Accredited businesses include listed PLCs, co-operatives, social enterprises and large private businesses. Some 275 businesses are currently Fair Tax Mark certified, who between them employ over 475,000 and contribute £4.1bn / €4.8bn in corporate income tax annually. Companies have now been certified in Denmark, Italy, Finland, Germany, the Netherlands, Spain, Sweden and the UK. See https://fairtaxmark.net/