Tax Assistant Manager

OEGen is a specialist energy investment manager overseeing more than £8 billion of assets under management. Its mission is to speed up the shift to a net zero energy system by backing clean energy infrastructure and energy transition businesses across multiple jurisdictions. As the international portfolio grows, the team is looking to strengthen its in-house tax capability with a commercially minded professional who wants to develop within a fast-paced investment environment.

The role sits within Sky Generation, the UK clean energy infrastructure platform of the Sky Fund, which owns and manages several international operating platforms. It’s a strong fit for someone with around four to five years’ corporate tax experience who wants broader international exposure and the chance to grow technical, commercial and project-management skills in an expanding infrastructure investment setting.

The successful candidate will support the Sky Fund’s portfolio and holding structures across multiple jurisdictions, collaborating with investment teams, finance colleagues, portfolio companies and external advisers on a broad range of tax matters, from compliance oversight and reporting to structuring and ongoing portfolio support. This is a hands-on role within a collaborative in-house tax team, offering exposure to international investment structures, cross-border transactions and the full lifecycle of infrastructure investments.

Tax life on international energy investments

Day to day, you’ll help manage tax matters across OEGen funds and their associated holding structures, ensuring coordination of international compliance processes with local advisers in several jurisdictions. You’ll assist with tax reporting, provisioning, and financial statement disclosures, and you’ll contribute to tax workstreams on acquisitions, restructurings and refinancings. When documents come in, you’ll review them from a tax perspective with support from more senior team members as needed, while keeping an eye on tax risks and governance. You’ll work closely with investment, finance, legal and external advisory teams across the business, and you’ll look for ways to improve internal tax processes and documentation as the portfolio evolves.

Your background for the role

Must-haves for the role include these qualifications and experiences. You should have around four to five years working in corporate tax, and hold a professional credential such as CTA or ACA (or be close to qualifying). Experience from a Big 4 firm, international advisory firm, law firm, or in-house tax team is expected, with a solid grounding in tax compliance, reporting and accounting. While exposure to cross-border structures or international tax matters is helpful, deep specialist knowledge isn’t required. An interest in infrastructure, energy or investment management is a plus, and foreign language skills (particularly German, French, Spanish or Italian) are beneficial but not required. Most importantly, the team is looking for someone with strong reasoning skills, solid commercial awareness and a real willingness to learn, someone who could grow into a broader international tax management role alongside experienced senior stakeholders.

• Around four to five years’ experience in corporate tax
• CTA, ACA or an equivalent credential, or near qualification
• Experience gained in a Big 4 firm, international advisory firm, law firm, or in-house tax team
• Strong grounding in tax compliance, reporting and tax accounting
• Exposure to cross-border structures or international tax matters is helpful but not essential
• Interest in infrastructure, energy or investment management is a plus
• Foreign language skills (German, French, Spanish or Italian) would be beneficial but aren’t required
• Strong reasoning, commercial awareness and a willingness to learn, with potential to grow into a broader international tax role

Nice-to-haves that help you stand out include additional cross-border experience, demonstrated ability to collaborate across investment, finance, legal and advisory teams, and a track record of supporting complex tax workstreams in a growing portfolio.

Compensation, perks and practical details

Salary for this role isn’t advertised; Octopus Energy Group prefers to discuss compensation on a call with a recruiter to match your experience with the right salary and ensure a good fit. The company emphasises flexibility and finding the right octofit, rather than sticking to a fixed number. The culture is described as unique, with people empowered to learn, decide and build quickly, and autonomy paired with co-ownership on projects that break new ground. Octopus has been recognised as the UK’s top company to work for in 2025 and ranked in the top ten in the Sunday Times Best Places to Work 2026, with the Group CEO discussing culture in a dedicated podcast. The UK perks hub, Octopus Employee Benefits, is available for review as part of the package.

Beyond the culture, the firm highlights a practical, supportive environment and a focus on rewarding hard work with perks that matter to employees. The organisation also frames itself as an equal opportunity employer with a commitment to fairness and inclusive practices, aiming to provide equal opportunities and an inclusive work environment for everyone.

Tips to help you stand out

Lead your resume with your corporate tax experience and your near-qualification status if applicable, so the hiring team sees you fit for a broader international scope from the start.

Show concrete examples of tax compliance, reporting and accounting work, ideally tied to cross-border or international structures, and highlight any involvement in acquisitions, restructurings or refinancings to illustrate your ability to support complex transactions.

Prepare to discuss how you collaborate with investment, finance, legal and external advisers, and be ready to talk through governance and risk management in multi-jurisdiction contexts.

Ask a targeted question about how the tax team coordinates across the Sky Fund’s portfolio and what success looks like in the role, such as how they measure tax governance improvements or the impact of cross-border structuring on portfolio performance.

How to apply

Interested candidates should email [email protected] with their details. The process typically takes up to four weeks, and a recruiter will guide through the stages. If you have questions before applying, the talent team is available at that address to help you.

Octopus Energy Group is an equal opportunity employer that does not discriminate on the basis of protected attributes. The company emphasises equal opportunities, an inclusive work environment, and fairness for everyone. For more about the culture and benefits, you can explore the UK perks hub and the various awards and features linked in the company’s communications.