Onside Welcomes Devan Wentworth as Head of US Tax
Onside is pleased to announce that Devan Wentworth has joined the firm as Head of US Tax, further strengthening our ability to support venture-backed startups and scaling businesses navigating US expansion, cross-border finance and US tax matters.
Devan is a UK-based US Certified Public Accountant (CPA) with more than 10 years' experience specialising in US tax compliance and cross-border matters. Having spent the majority of her career at Deloitte in London, she has advised multinational groups, venture-backed startups and private equity-backed businesses on US expansion, compliance and reporting requirements.
Her experience spans US corporate tax compliance, international reporting obligations, fund reporting and supporting investment structures with US reporting requirements. This gives her a deep understanding of the practical challenges founders and finance teams face as they scale internationally and raise investment.
At Onside, Devan will lead the firm's US Services offering, working closely with founders and finance leaders navigating post-“Delaware flip” structures, setting up US subsidiaries and ongoing cross-border compliance requirements. The service is designed to help businesses manage the practical challenges of operating across the UK and US through a single, coordinated advisory relationship.
The appointment marks an important step in Onside's continued investment in supporting venture-backed and internationally operating businesses. By bringing UK and US accounting and tax expertise together under one roof, Onside helps clients access joined-up advice across both jurisdictions.
Martin Brennan, Founder of Onside, said:
"Many of our clients operate UK-US group structures and find themselves managing multiple advisors across different jurisdictions. We believe there is a better way.
Our ambition is to provide a genuinely integrated UK and US service, bringing accounting, tax and advisory expertise together within a single team. By combining specialists across both jurisdictions, clients benefit from joined-up advice, greater consistency and a much smoother experience as they grow internationally."
"Devan brings exceptional technical expertise and extensive experience supporting businesses with US expansion, making her a fantastic addition to the team."
Devan Wentworth added:
"Having spent most of my career in a UK-based US tax practice, I’ve seen the challenges businesses face when expanding into and operating within the US. There is a real need for support in one place that understands how UK companies operate while also navigating the realities of the US tax system.
What attracted me to Onside was the opportunity to combine US tax expertise with an established accounting and tax team that already supports ambitious technology businesses across the UK. By bringing those services together, Onside can provide founders and finance teams with greater visibility of their UK and US obligations, reducing the need to coordinate multiple advisors as they scale internationally."
Devan joins Onside at a time when increasing numbers of UK startups are navigating more complex international structures. Her appointment reflects the firm's continued investment in providing specialist support for ambitious businesses as they scale, raise investment and grow across multiple markets.
Connect with Devan
If you have a US expansion question you’d like to discuss, you can reach Devan directly: