Civil Works Alliance
Tax Manager
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Help Shape the UK’s Energy Future
Tax Manager Opportunity with the Civil Works Alliance (CWA), Supporting Sizewell C
As part of the CWA (Civil Works Alliance), you will support the building of Sizewell C. Sizewell C will be a 3.2-gigawatt power station generating low-carbon electricity for around 6 million homes and will play a key role in our energy future, supplying reliable, clean electricity for at least 60 years. This role will be within the CWA Wide Section.
What will you do?
The Tax Manager is responsible for the delivery and oversight of employment tax compliance and advisory across the BBBYLO Civil Works Partnership and BBBYLO Services Ltd, while supporting broader UK tax matters (CIS, VAT, RDEC) at a managerial level.
The role focuses on employment tax and IR35 as core priorities, with responsibility for coordinating wider tax deliverables, identifying risks, and escalating complex technical matters to specialist IP tax teams where required.
Operating within a complex construction and infrastructure alliance, the role requires strong employment tax expertise, sound judgement across other taxes, and the ability to manage stakeholders and deliverables rather than deep technical specialism in all areas.
Employment Taxes & IR35 (Core Focus)
- Lead employment tax compliance (PAYE, NIC, benefits, FPS/EPS)
- Ensure IR35 compliance and prepare SDS
- Advise HR and Procurement on engagement structures
- Identify and mitigate employment tax risks
- Act as subject matter lead for employment tax
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CIS & VAT Oversight
- Oversee CIS and VAT compliance and filings
- Support operational teams on VAT/CIS matters (including DRC)
- Identify risks and escalate complex issues
R&D Tax Credits (RDEC) Coordination
- Coordinate RDEC claims and documentation
- Manage stakeholders and timelines
- Escalate technical complexities to specialists
Tax Governance & Risk
- Maintain tax risk register and controls
- Ensure compliance processes are robust
- Monitor legislative changes
- Support tax policy development
Audit & HMRC Engagement
- Coordinate HMRC enquiries and audits
- Ensure timely and accurate submissions
- Act as liaison with IP tax teams
Business Partnering
- Advise Finance, HR, Procurement and Commercial teams
- Support tax considerations in contracts and operations
Stakeholder Management
- Build relationships with internal teams, IPs and advisors
- Act as a coordination point across tax matters
What are we looking for?
Knowledge & Skills
Essential
- Strong employment tax and IR35 expertise
- Good understanding of VAT, CIS and UK tax
- Experience managing compliance and deliverables
- Strong judgement and risk awareness
- Excellent communication skills
Desirable
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- Construction/infrastructure experience
- Exposure to RDEC
- Experience in complex/matrix environments
Role Offering
- Clear employment tax specialisation
- Exposure to wider tax matters
- Interaction with senior stakeholders
- Strong development potential
What we will offer you?
The CWA is a single delivery organisation made of up of the client (Sizewell C) and three parent companies - Balfour Beatty, Bouygues and Laing O'Rourke - which offer industry leading packages including market leading salaries, generous annual leave entitlements, pension scheme and other flexible benefits.
About Us
The CWA celebrates the creativity and innovation that comes from a diverse workforce, and we welcome applications from people of all backgrounds — especially those from under‑represented communities. Our project is built on five core values: Humility, Positivity, Respect, Solidarity, and Clarity.
By joining us, you’ll be encouraged to bring your whole self to work, speak up, and share your ideas. We encourage applications from all suitably qualified candidates, regardless of gender, race, disability, age, sexual orientation, gender reassignment, religion or belief, marital status, or pregnancy and maternity.
We are committed to protecting your privacy. If you decide to apply, please avoid including sensitive personal data in your CV.
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