In new system all service tax code/excise (STC) are of 15 characters and based on PAN. Here first ten character are same as PAN ,11-12 digit is “ST” in all service tax code (In few cases “SD” is also used),13-15 is sr no for service tax number allotted against a pan number ,if you have applied for one service tax number against a pan then your service tax number will be PAN+ST+001. So if you have a pan number of the firm then check service tax number as below.

I. Assessee code to be digitized in case of Central Excise (major account head 0038) as :
1-10 digits : 10-digit PAN
11-12 digits : XM
13-15 digits : ZZZ

II. Assessee code to be digitized in case of Service Tax (major account head 0044) as :

1-10 digits : 10-digit PAN / TAN
11-12 digits : ST
13-15 digits : ZZZ

III. In case the assessee is unable to provide a valid location code, the location code may be digitized as :

1-2 digits : any Commissionerate Code associated to the bank branch
3-6 digits : ZZZZ

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