Yes, you could lose the benefit of the Beckham Law tax regime if you change jobs, especially if you do not notify the Spanish tax authorities or if you do not maintain the criteria that allowed you to benefit from the regime. It is crucial that the new job meets the requirements established by the law, such as being related to an eligible company or sector. It is advisable to report any changes in your employment situation and ensure that you continue to meet the conditions for maintaining the scheme.