INDIAN REVENUE SERVICE (IRS)
The Indian Revenue Service (IRS) was formed in the year 1946 under the cadre controlling authority of Ministry of Finance, Department of Revenue with a cadre size of 2500 The source of recruitment (in percentage) is by direct recruitment 50% by promotion 50% and by lateral entries (if any).

Service hierarchy:

Grade	Pay scales	Designation in field	Designation in headquarters	Any other designation
Junior time scale	8000- 275 -13500	Assistant commissioner
Senior time scale	10000- 325 -15200	Deputy commissioner
Junior administrative grade	12000- 375 -16500	Joint commissioner
Selection grade	14300- 425 -18300	Additional commissioner
Senior administrative grade	18400-500-22400	Commissioner
Higher administrative grade	22400-525-24500	Chief commissioner or Director General
	24050-650-26000		Member, CBDT
	26000 (fixed)		Chairman, CBDT

Brief write up on the service outlining the main functions etc. including areas where interaction and coordination with other services is essential:
The IRS manages the administration of direct taxes in the country. They are responsible for administering wide gamut of fiscal laws like the income tax act, wealth tax, gift tax, interest tax act, expenditure tax act, etc. Their immediate objective is to collect direct taxes and to detect and deter evasion. The central board of direct taxes is the apex body dealing with the matters pertaining to direct taxes. It comprises of a chairman and five other members.

Members of CBDT are responsible for (a) investigation (b) income tax (c) personal and vigilance (d) tax policy and legislation (e) revenue and audit. The chief-commissioner of income tax are responsible for the overall administration of field officers and for meeting the action plan targets relating to collection of taxes, completion of assessments, expenditure budget, public relations, filing of reference applications in the High Court, prosecution of tax delinquents etc.