Would you please tell about the stages to cross to get promotion from Tax Assistant to Income Tax Inspector(ITI) post ?

Candidate who posted on Tax Assistant post promoted on Income Tax Inspector(ITI) post as the following path:

Stage 1 : Sr Tax Assistant
Stage 2 : Income Tax Inspector(ITI)

After ITI post candidate get promotion on following post :
ITO (Group-B gazetted)
Assistant commissioner.

Promotion depends on learning skills , work strategy , performance , vacancy and experience .

Tax Assistant in CBDT salary and allowances

Pay Scale
5200-20,200

Grade Pay
2400

Initial Pay
5200

Allowances:
DA on Total Pay
Transport Allowance
House Rent Allowance(if not provided with quarters)
Petrol allowance
MTNL/BSNL sim

Nature & Type of Duties Performed by Tax Assistant in CBEC:

Usually work of a Tax Assistant is purely clerical.

Work mainly includes dispatch and prepare some reports of the section he is posted in.

Works under Superintendent or Appraiser, Examiner, PO and Excise Inspector.

Usually 6 days week affair there.

Tax Assistant (TA) is also posted as PA (Personal Assistant) of commissioners .