The budget 2015 is likely to pave way for GST or Goods and Services Tax. It is expected that various indirect taxes will be merged in single tax. India being a federal economy, there will be separate centre and state GST. For more information on advantages of GST, please see:
https://in.finance.yahoo.com/photos/what-is-goods-and-services-tax-and-how-does-it-help-slideshow/