Prepare ahead of time prior to your job interview on how you intend on answering this question. A good place to start is to research the industry standard or market related salary that employees in similar roles are earning. Generally this information can be found on the internet or alternatively recruitment agents will be able to give you a good indication of your market related salary. In your interview, try not to discuss exact figures but rather give a ball park figure that you will be able to negotiate on later on should the employer makes you an offer. Never discuss your salary goals unless asked by the interviewer.