An established and growing independent accountancy practice is seeking a Tax Senior / Assistant Manager to join its expanding Business Services team. This is an excellent opportunity for a tax professional looking to develop their career within a supportive, well-structured tax department that actively encourages progression. The firm is part of a wider UK network of independent practices and has continued to achieve strong growth in recent years. The role is office-based to support collaboration, efficiency, and timely delivery of client work. The Team You will join a well-established tax team of around 10 professionals, including senior leadership, managers, qualified accountants, and trainees. The tax function is split across two key areas: Corporate Tax and Tax Planning / Advisory Personal Tax and P11Ds The wider firm also has specialist teams covering payroll, company secretarial, and accounting/audit services. The client base primarily consists of owner-managed businesses and groups across a broad range of sectors. The Role The successful candidate will be responsible for delivering high-quality personal and corporate tax compliance services while supporting client relationships and mentoring junior team members. Key responsibilities include: Managing a portfolio of personal and corporate tax clients Preparing and reviewing personal and corporate tax returns and computations Ensuring all filing and reporting deadlines are met Acting as a point of contact for client and HMRC correspondence Dealing with client queries in a timely and professional manner Identifying and communicating tax planning opportunities Assisting with more complex corporate tax matters Maintaining high standards of tax compliance across the portfolio Supporting and training junior members of the team Liaising with other departments where required Person Specification Candidates will have experience in some or all of the following areas: Corporation tax compliance Personal tax returns and computations P11Ds Partnership tax returns Managing a client portfolio Dealing with HMRC enquiries and disputes Strong knowledge of Corporation Tax, Income Tax, and Capital Gains Tax Awareness of VAT, Inheritance Tax, and other taxes (e.g. SDLT) Experience using tax software (e.g. CCH or similar) Strong written and verbal communication skills Excellent organisational and time-management skills A flexible approach to working hours during peak deadlines Experience within an accountancy practice environment is essential, and up-to-date CPD records are expected. Working Arrangements Hours: 37.5 hours per week, Monday to Friday (8:30am - 4:30pm), with flexibility to meet business needs Location: Office-based role in South Wales Benefits Competitive salary, dependent on experience 30 days' holiday including bank holidays and additional Christmas closure days Life assurance (2x salary) Pension scheme Professional subscription fees paid (ICAEW / ACCA)