Amendment in service tax pan number

You can file for amendment in ST-2 through Form ST-1. Amendment if required to file when there is changes in the particulars furnished in ST-1 at the time of registration. Such changes are required to be intimated to Service Tax Department within 30 days of such change. It should be clearly mentioned that ST-1 is being filed for amendment and not for new registration and for this certified copy of existing regisration certificate (ST-2) should be enclosed with application for amendment (in ST-1). In your case you may also enclose covering note explaining the circumstances that led to changes along with copies of relevant documents (death certificate etc.) Please also note that in certain cases  the details changed may warrant a fresh physical verification or the issue of a new Registration Certificate