As you are looking for information about Tax Assistant Post through SSC CGL Exam, so here I am telling you about Monthly salary:

Tax Assistant in CBDT career path:
Sr. Tax Assistant
Assistant Commissioner
Income Tax Inspector (ITI)
ITO (Group-B gazetted)

Salary:
Pay Scale 5200-20,200
Grade Pay 2400
Initial Pay 5200
Total Pay (i) + (ii ) 7600

Allowances:
DA on Total Pay above (around 107 %)
Transport Allowance
Petrol allowance
House Rent Allowance(if not provided with quarters)
A MTNL/BSNL sim from the department on which all STD calls on every type of BSNL/MTNL phone are free; and 400 minutes on other phones whether STD or LOCAL are free for every month. And also 1 GB 3G data free use of data on internet.

TAX Assistant Salary After 7th Pay commission 2016

BASIC + Allowncess X Category city Y Category City Z category City
Basic Salary 18000 18000 18000
DA 0 0 0
HRA 4320 2880 1440
TA 1350 900 900
DA On TA 0 0 0
Gross Salary 23670 21780 20340
NPS 1800 1800 1800
CGHS 125 125 125
CGEGIS 1500 1500 1500
Deductions 3425 3425 3425
Cash In Hand 20245 18355 16915