A top 20 Tax and Accountancy Firm based in Reading is looking for an Expatriate Tax or Global Mobility Tax Senior Manager. This role provides an opportunity for an experienced global mobility or employment tax professional to take a leading position in delivering high-quality advisory services to a diverse client portfolio. You will act as a trusted senior advisor, ensuring excellent service delivery, strong client relationships, and effective risk management.The position combines technical leadership, client management, business development, and people management, making it well suited to an individual seeking a senior role within a growing and ambitious tax practice.Key ResponsibilitiesClient and Project DeliveryServe as the primary employment tax contact for key clients, with responsibility for quality, risk management, and service deliveryAnticipate client needs, respond promptly to requests, and maintain regular communication on project progressBuild, manage, and develop a client portfolio, including responsibility for billing and cash collection in line with firm policiesSupport tax planning and complex advisory work in collaboration with senior leadershipBusiness Development and MarketingIdentify and pursue new business and growth opportunities with senior supportRecognise and leverage marketing and profile-raising opportunitiesDevelop and maintain strong internal and external networks to generate a sustainable pipeline of workLeadership and ManagementProvide support t