I will let you know working profile of Tax Assistant CBEC so that you can go through it and remember it.

There are three types of postings
Excise

Service Tax

Customs

Pay Scale
Pay Scale: Rs. 5,200 – 20,200/-

Grade Pay: Rs. 2,400/-

Perks and allowance like
DA on Total Pay
Transport Allowance (TA)
House Rent Allowance (if not provided with quarters)
Mobile Bill

Promotions & Department Exams
1. Senior Tax Assistant
2. Excise Inspector/PO/Examiner
3. Superintendent/Appraiser (Group-B gazetted)
4. Assistant Commissioner
5. Deputy Commissioner (+4 years)
6. Joint Commissioner (+4 years)
7. Additional Commissioner of Income Tax (+5 years)

Nature of Work
They are generally posted in Pay and Accounts Offices and Divisional Offices under various ministries. Broadly you can divide his duties as follows:

A. Passing of Various Bills: Salary, Allowances, Office Expenses, Contingent Bills etc.

B. Dealing with Pension and GPF matters: New Pension Scheme, Revision of Pension,

C. Granting Family Pension, Gratuity, Leave Encashment, Group Insurance, etc

D. Receipts and Payments: To see accounting of revenue and compiling the expenditures incurred in civil ministries.

E. Any other