US Corporate Tax Manager/ Senior Manager

US Corporate Tax Manager / Senior Manager
London
Founded in 2013, Sestini & Co (Sestini) are a team who specialise in tax consultancy for expatriates and high net worth individuals. Sestini joined the Shaw Gibbs Group in August 2024, a growing top 35 accountancy practice who provide expert solutions for entrepreneurial businesses and private individuals. 
Members of the Shaw Gibbs Group are committed to investment in their teams of high-quality specialists who work with the best-in-breed technology to create value for clients which exceeds expectation. 
The culture of the firm is very important to us and is based on our company values of expert, respectful, innovative and collaborative. We develop high performing teams diverse in experiences, backgrounds and ideas. As a growing company, there are plenty of opportunities for development and quick progression. Our practice is known for having a friendly and supportive team culture where everyone receives training and development to increase their technical knowledge and their commercial and management skills. We put our people first and are constantly looking for ways to improve our people experience. With respectful as one of our values, we are committed to creating an inclusive culture that respects, values and celebrates cultural and individual differences.
We have several offices in Central and Southern England and have ambitious plans to expand our business. To support the organisation’s growth, we have created a new opportunity for a US Corporate Tax Manager / Senior Manager to join our London US Tax team. This is a permanent, full-time or part-time role with hybrid and flexible working options.
Key Responsibilities

• Lead on US corporate tax compliance and advisory projects for UK-based multinational clients.
• Manage preparation and review of US federal and state corporate tax returns, ensuring accuracy and timeliness.
• Provide technical guidance on cross-border tax issues, including transfer pricing, repatriation strategies, and BEPS-related matters.
• Interpret and apply US tax legislation, IRS guidance, and relevant case law to client situations.
• Advise on US GAAP and ASC 740 tax accounting implications for corporate clients.
• Support clients with US tax audits and liaise with IRS/state authorities when required.
• Identify opportunities to expand US tax services within existing client portfolios.
• Supervise, mentor, and develop junior staff within the tax team.
• Collaborate with UK corporate tax, international tax, and transfer pricing specialists to deliver integrated solutions.
• Ensure compliance with internal risk management policies and professional standards.
• Maintain up-to-date knowledge of US tax developments and communicate changes to clients and colleagues.

What We Can Offer You

• Hybrid working (three days in the office and two days at home)
• Flexible working (flexing your hours around the core working hours of 10am to 4pm)
• Joining a fast-growing company with exciting growth plans ahead
• Exposure to a wide range of clients across many industries
• Plenty of opportunity to increase your technical knowledge and skills
• A varied role within a talented and experienced team
• Entry onto our next Management Development Programme – a bespoke programme aimed at developing and enhancing leadership potential for existing and aspiring managers
• ERIC internal recognition awards – monthly recognition awards that celebrate those who champion the Shaw Gibbs values 
• Long service awards
• Regular employee events including a company-wide summer party
• A competitive benefits package, including:
  • A 25-day core holiday allowance plus other holiday-related benefits, such as: Holiday trading (the ability to buy or sell up to 5 days holiday per year), flexible bank holidays (the ability to flex your bank holidays to a day that suits you best) and additional holiday with service
  • A dedicated “Wellbeing Day” – an additional day off per year to focus on your wellbeing
  • Employee Assistant Programme (EAP) which includes access to 24/7 online GP consultations, 2nd medical opinions and mental health first aiders present in every office
  • Access to MYNDUP – a wellbeing support platform which offers confidential 1-to-1 sessions with therapists, counsellors, psychologists, and coaches. 
  • Shaw Gibbs Rewards – access to discounts on a wide range of retailers
  • Health Cash Plan – money back on routine health appointments
  • Electric Vehicles Salary Sacrifice Scheme
  • Client and employee referral bonuses
  • Pension Salary Sacrifice Scheme
  • Death in Service Life Assurance
  • Enhanced family leave policies
  • Cycle to Work Scheme

About You
We would like to hear from you if you have 3-6 years’ post-qualified experience in US corporate tax, ideally gained in a mid or top-tier accountancy firm. We are also looking for the following:

• You will be an enrolled Agent, US CPA, JD (or near to certification)
• You will have previously been a designated signer for US returns
• You will have strong technical knowledge of US Tax return procedures
• You will have generalist experience across UK & US tax procedures or a specific US tax focus
• Deep knowledge of US federal and state corporate tax legislation.
• As one of the above you will experience of communicating with the IRS regarding client matters
• A familiarity with US Foreign Informational filings such as Forms 8858, 5471, & 8865 is desirable 
• A familiarity with basic accounting principles & financial statements is desirable 
• University degree with 2.1 or higher or 3 good A-Level results (or equivalent)
• Proven track record of managing complex US tax compliance and advisory projects for multinational clients
• Experience with ASC 740 tax accounting and US GAAP reporting
• Familiarity with international tax issues, including double tax treaties and OECD guidelines
• Strong analytical and problem-solving skills with attention to detail
• Excellent communication skills, both written and verbal, with the ability to explain complex tax concepts clearly
• Strong client relationship management and business development abilities
• Demonstrated leadership in managing teams and developing junior staff
• Commercially aware, proactive, and able to identify opportunities for clients and the firm
• High level of integrity and commitment to professional standards

Diversity, equality and inclusion
Shaw Gibbs is an inclusive employer, and we are committed to providing equal opportunities to all candidates by ensuring a comfortable and accessible interview experience. We understand that some individuals may have specific needs or require accommodation/adjustments during the recruitment process. If you require any adjustments to ensure your recruitment experience with Shaw Gibbs is as inclusive and accessible as possible, please let us know at your earliest convenience via the application form or via an email to [email protected].
We believe that diversity makes Shaw Gibbs a stronger firm and we look to employ people with different ideas, styles and skillsets. This diversity stimulates a rich, creative environment – one in which our people develop, and our clients enjoy enduring results. We’re committed to recruiting, promoting and rewarding our people solely based on their ability to contribute to Shaw Gibbs’ goals, without regard to their sex, gender, race, disability, religion, national origin, ethnicity, sexual orientation, age or marital status.