Corporate Tax Senior Manager

Sumer NI is one of Northern Ireland’s leading accountancy and business advisory firms, combining local expertise with the strength and investment of the wider Sumer Group – one of the UK’s fastest-growing accountancy firms.

Our team is known for building long‑term relationships with ambitious businesses, entrepreneurs, owner‑managed companies and large corporate organisations across Northern Ireland and beyond. We deliver commercially focused advice that goes beyond compliance, helping our clients make confident business decisions and achieve sustainable growth.

As part of Sumer, you'll enjoy the best of both worlds: the close‑knit, collaborative culture of a local firm, alongside the opportunities, investment and career progression that come with being part of a rapidly expanding national group. We’re committed to creating an environment where talented people can thrive, develop their expertise and make a genuine impact. If you're looking for a role where you'll work with high‑quality clients, develop your leadership skills and play an active part in a growing and ambitious tax team, we’d love to hear from you.

Key Responsibilities

• Lead and deliver UK corporation tax advisory projects for owner‑managed businesses, SMEs, groups and larger corporate clients, ensuring advice is technically robust, practical and commercially relevant.
• Advise on corporate restructures and reorganisations, including holding company structures, group simplification, demergers, hive‑ups and pre‑sale restructuring.
• Support transaction‑related tax advisory work, including acquisitions, disposals, due diligence, tax structuring, management buy‑outs, succession planning and exit readiness.
• Provide advice on corporation tax reliefs and incentives, including capital allowances, substantial shareholdings exemption, loss utilisation and group relief planning.
• Assist clients with international and cross‑border corporation tax matters, such as transfer pricing, permanent establishment risk, withholding taxes and overseas expansion considerations.
• Work closely with Tax Directors and colleagues across audit, accounts, corporate finance and private client teams to identify advisory opportunities and deliver joined‑up client solutions.
• Act as a key point of contact for complex UK corporation tax technical queries, preparing clear advice notes, reports and client communications.
• Lead, coach and develop members of the tax team, helping them build advisory skills, commercial judgement and technical confidence.
• Contribute to the growth of the tax advisory function through business development, proposal support, client relationship management and wider firm initiatives.

Skills, Knowledge & Expertise

We’re looking for someone who is technically strong, commercially minded and passionate about developing both clients and people. You’ll ideally have:

• Strong experience of delivering complex Corporate Tax advisory services within an accountancy practice.
• ACA and/or CTA qualification (or equivalent).
• Excellent technical knowledge with the ability to provide practical, commercial advice.
• Previous experience managing, mentoring or developing junior team members.
• Strong communication and relationship‑building skills with a client‑focused approach.
• A proactive mindset and enthusiasm for contributing to a growing and ambitious business.

Why have a Tax career with us?

Our tax specialists work closely with a broad range of businesses, from ambitious owner‑managed companies and Top 100 Northern Ireland businesses through to UK subsidiaries of international groups. You’ll enjoy genuine client exposure, interesting and varied work, and the opportunity to provide practical, commercially focused advice that makes a real difference. With a strong pipeline of growth and investment across the business, there are excellent opportunities to broaden your experience and progress your career.

Belong @ Sumer

At Sumer, we know everyone’s journey is different. That’s why we’re committed to fairness, removing barriers, and giving people the support they need to do their best work. If you need any support during the hiring process, just let us know. Our values represent what matters most to us and guide how we work every day:

• We Shine Together
• We Do the Right Thing
• We Make It Count

We know diverse teams make us stronger. That’s why we’re creating an inclusive workplace where everyone belongs and differences are valued and celebrated.