Accounting Entry for Excise & Sales Tax

Hi All,

Very good morning

I am designing a software in which i need to post Sales Tax & Excise Entry.

So please let me know when it should be posted and with which amount

Case 1:

Purchase 1000 Rs / Excise 100 / Sales Tax 100 Rs

Goods Received of 500Rs along with bill

Case 2:

Sales is made of 1000 Rs / Excise 100 Rs / Sales Tax 100 Rs

Creditor becomes insovent so nothing is recovered from him

Should I have to remit Sales Tax and Excise to Government Authority??

Thanks in Advance

ChintaN