At present, tax administration in India works poorly. We do not know how to build a capable and uncorrupt tax administration. In the absence of this State capacity, we should start with a GST design that imposes a low load upon tax administration. Only after this is proven to work at high levels of probity and operational efficiency can we consider the possibility of going up to higher levels of load.
Every single expert committee which wrote on this subject has recommended these changes: Setup a debt management office, merge regulation of organised financial trading, give RBI clarity of purpose to stabilise inflation.
In large part, Budget 2015 does not rise to the challenge. It has some good elements, and with good execution, they will make an important difference. But an array of important and pressing problems have been left unsolved.