3. Reliance Infrastructure

Year End: March 2012

Profit Before Tax: 1,804 crore

Tax: 175 crore

Effective Tax Rate (In Percent): 9.7

Reliance Infrastructure is headquartered in Mumbai and was formerly known as Reliance Energy. It is the largest private sector enterprise in power utility in India and it's a company under the Reliance Anil Dhirubhai Ambani Group banner. The company is the sole distributor of electricity in the suburbs of Mumbai. It also runs power generation, transmission and distribution businesses in other parts of Maharashtra, Andhra Pradesh and Goa.

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4. Sun Pharma

Year End: March 2012

Profit Before Tax: 3,355 crore

Tax: 383 crore

Effective Tax Rate (In Percent):11.4

Sun Pharmaceutical Industries Limited is an Indian pharmaceutical company located in Mumbai and does over sea business. It manufactures and sells medicinal drugs primarily in India and the United States. It primarily produces curative formulation for cardiology, psychiatry, neurology, gastroenterology and diabetology related health ailments.

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5. Bank of Baroda

Year End: March 2012

Profit Before Tax: 6,304 crore

Tax: 1,088 crore

Effective Tax Rate (In Percent): 17.3

Bank of Baroda (BoB) is the highest profit-earning Public Sector Undertaking (PSU) bank in India. It has a network of 4007 branches and offices, and over 2000 ATMs. It provides a wide range of banking products and financial services like asset management, credit cards and investment banking, to corporate and retail customers.