Corporate Tax Senior/Supervisor

Simmons Gainsford, part of the Sumer Group; Greater London; On-site; GBP 70,000 - 95,000; Full time

Job summary

Simmons Gainsford, part of the Sumer Group, is growing its London tax team and seeks a Corporate Tax Senior/Supervisor. You will manage a varied portfolio from owner-managed businesses to large corporates, delivering compliance and advisory work while building trusted client partnerships.

You will work on the corporate tax compliance cycle, advise on structuring and tax planning, and liaise directly with clients to deliver practical, timely guidance.

Qualifications

• Qualified in UK corporate tax with professional body (ATT/ACA/ACCA/CTA)
• Experience advising owner-managed businesses and large groups
• Strong client relationship management and advisory skills

Responsibilities

• Manage and oversee a portfolio of corporate tax clients including owner-managed and large corporates
• Prepare and review corporate tax returns using Alphatax
• Liaise with clients to gather information and provide timely advice
• Handle HMRC correspondence and enquiries on clients' behalf
• Contribute to advisory projects such as restructurings and tax planning
• Support on wider business transactions and WIP/billing processes
• Identify opportunities to add value and participate in business development
• Attend and contribute to client meetings and technical research

Skills

UK corporate tax

Client management

Tax research

Communication

Team collaboration

Education

ATT / ACA / ACCA / CTA

Tools

Alphatax

Job description

Description

At Simmons Gainsford, part of the Sumer Group, we’re continuing to grow our tax team in London and are looking to bring in a Corporate Tax Senior / Supervisor. This is a great opportunity to work closely with a varied portfolio of owner-managed businesses, supporting them across both compliance and advisory as they develop and scale.

In this role, you’ll play a key part in delivering high-quality corporate tax services, building strong client relationships and becoming a trusted adviser to entrepreneurial businesses. There’s a strong mix of hands‑on compliance work alongside exposure to a broad range of advisory projects, giving you the opportunity to further develop both your technical expertise and commercial understanding.

Department

Corporate Tax

Location

London Cavendish Square

Key Responsibilities

• Manage and oversee a portfolio of corporate tax clients, ranging from OMBs to large corporates and group structures with international presence.
• Prepare and review corporate tax returns using Alphatax
• Liaise directly with clients to gather information and provide practical, timely advice
• Deal with HMRC correspondence and enquiries on behalf of your clients
• Support on a range of advisory projects, including corporate structuring, group reorganisations and tax planning
• Assist with tax aspects of wider business transactions where required
• Monitor WIP and support timely billing processes
• Identify opportunities to add value to clients and contribute to business development
• Attend and contribute to client meetings
• Undertake technical research across a range of corporate tax matters

Skills, Knowledge & Expertise

• ATT / ACA / ACCA qualified or CTA part-qualified / qualified
• Strong experience in UK corporate tax within a practice environment
• Experience in managing or supporting a portfolio of clients
• Good working knowledge of the corporate tax compliance cycle
• Ability to build strong client relationships across all corporate clients with a strong understanding of commercial drivers
• Strong communication skills, both written and verbal
• Well organised, with the ability to manage multiple deadlines
• Comfortable using tax software and tax research tools
• Ability to work collaboratively within a team environment.

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.

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• 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.