Tax Assistant Manager

OEGen is a specialist energy investment manager overseeing more than £8 billion of assets under management. Our mission is to accelerate the transition to a net zero energy system by investing in clean energy infrastructure and energy transition businesses across multiple jurisdictions.
As our international portfolio continues to grow, we are looking to strengthen our in-house tax capability with the addition of a commercially minded tax professional who is keen to develop within a fast-paced investment environment.
The Role
We are looking for a Tax Assistant Manager / emerging Tax Manager to join the OEGen Tax Team, reporting directly to the Funds & Deals Tax Lead. The successful candidate will join the tax function at Sky Generation, the UK clean energy infrastructure platform of the Sky Fund, which owns and manages a number of international operating platforms. These businesses are active across Europe and beyond, developing, investing in and managing renewable energy and broader energy transition assets.
This is a strong opportunity for someone with around 4–5 years’ experience who is looking to step into a broader international role and continue developing their technical, commercial and project management capabilities within a growing infrastructure investment environment.
The role will support the Sky Fund’s portfolio and associated holding structures across multiple jurisdictions. You will work closely with investment teams, finance teams, portfolio companies and external advisers on a broad range of tax matters, including tax compliance oversight, reporting, transactions, structuring and ongoing portfolio support.
The position offers wide exposure to international investment structures, cross-border transactions and the full lifecycle of infrastructure investments, while working within a collaborative, hands-on and growing in-house tax team.

What you'll do

Support the management of tax matters across OEGen funds and associated holding structures. 

Coordinate international tax compliance processes with local advisors across multiple jurisdictions. 

Assist with tax reporting, tax provisioning, and financial statement disclosures. 

Support tax workstreams on acquisitions, restructurings, refinancings, and other transactions. 

Review transaction and financing documentation from a tax perspective, with support from senior team members where needed. 

Monitor tax risks and support ongoing governance and compliance processes. 

Work closely with investment, finance, legal, and external advisory teams across the business. 

Contribute to the continuous improvement of internal tax processes and documentation.

What you'll need

Around 4–5 years’ experience in corporate tax. 

CTA, ACA, or equivalent qualification (or close to qualification). 

Experience gained in a Big 4 firm, international advisory firm, law firm, or in-house tax team. 

Good grounding in tax compliance, reporting, and tax accounting. 

Exposure to cross-border structures or international tax matters is helpful, but deep expertise is not expected. 

An interest in infrastructure, energy, or investment management is a plus. 

Foreign language skills (particularly German, French, Spanish, or Italian) would be beneficial but are not required. 

Most importantly, we are looking for someone with strong reasoning skills, good commercial awareness, and a willingness to learn. This role would suit someone looking to grow into a broader international tax management role over time, working closely with experienced senior stakeholders in a supportive and collaborative environment.

Why else you'll love it here

• Wondering what the salary for this role is? Just ask us! On a call with one of our recruiters it's something we always cover as we genuinely want to match your experience with the correct salary. The reason why we don't advertise is because we honestly have a degree of flexibility and would never want salary to be a reason why someone doesn't apply to Octopus - what's more important to us is finding the right octofit! • Octopus Energy Group is a unique culture. An organisation where people learn, decide, and build quicker. Where people work with autonomy, alongside a wide range of amazing co-owners, on projects that break new ground. We want your hard work to be rewarded with perks you actually care about! We were named the UK's top company to work for in 2025, and we ranked in the top ten in the Sunday Times Best Places to Work 2026. Our Group CEO, Greg has recorded a podcast about our culture and how we empower our people. We’ve also been placed in the top 10 companies for senior leadership • Visit our UK perks hub - Octopus Employee Benefits   If this sounds like you then we'd love to hear from you, tell us what you care about, why Octopus feels right and most importantly, bring us the real you! Applying for jobs can be a bit scary so have a nose through some of our tips first 🚀   P.S. Our process usually takes up to 4 weeks, but we’ll always do our best to flex around what works for you. Along the way, you’ll chat with our recruitment team and your Recruiter will help you throughout different stages. Got any burning questions before then? Drop us a message at [email removed] and we’d love to help!   Are you ready for a career with us? We want to ensure you have all the tools and environment you need to unleash your potential. Need any specific accommodations? Whether you require specific accommodations or have a unique preference, let us know, and we'll do what we can to customise your interview process for comfort and maximum magic!   Studies have shown that some groups of people, like women, are less likely to apply to a role unless they meet 100% of the job requirements. Whoever you are, if you like one of our jobs, we encourage you to apply as you might just be the candidate we hire. Across Octopus, we're looking for genuinely decent people who are honest and empathetic. Our people are our strongest asset and the unique skills and perspectives people bring to the team are the driving force of our success. As an equal opportunity employer, we do not discriminate on the basis of any protected attribute. Our commitment is to provide equal opportunities, an inclusive work environment, and fairness for everyone.