Will India, a $2 trillion (£1.5tn) economy with one.3 billion shoppers, currently become a very single market?
Many believe the landmark product and services tax - passed into law by parliament on weekday, when years of filibustering by the ruling BJP and main opposition Congress - may be a key step in this direction.
It is conjointly the foremost vital tax reform since independence for what's currently Asia's third largest economy.
The GST subsumes India's mussy inordinateness of indirect taxes, duties, surcharges and cesses into one tax.
It is expected to:
ease a cumbersome tax system
help goods move seamlessly across state borders
curb tax evasion
make investing and doing business in India easier
Some 160 countries, according to consulting firm Deloitte, have some form of GST or value added tax.
The federal and state governments will jointly administer India's dual GST.
This means it will be a set of 38 different taxes:
a GST for each of the 29 states and seven federally administered union territories
a federal GST an integrated GST on inter-state supplies of goods and services It, as The Economist says, is "not quite an act of fiscal unification" but simpler than the thicket of taxes it will replace.
What promises to one of the world's most complex tax reforms is expected to be serviced by state-of-the-art technology.
Indian software giant Infosys is building a gigantic electronic infrastructure - a GST portal - where taxpayers can register, make payments and file returns.
Some 7.5 million businesses will be covered by the tax.
Clearly, a successful GST in India will be a minor miracle.
"No country of comparable size and complexity has attempted a tax reform of this scale," says Harishankar Subramanian, of Ernst and Young.
The GST is also a potential game-changer as the burden of taxation moves from the state of manufacture to the state of consumption of goods and services.
Experts believe fears that revenues of manufacturing hubs - such as Gujarat and Maharashtra - will be hit are unfounded as such states attract more workers, who make up a growing base of consumers.
But some of the biggest beneficiaries, they say, will be populous, manufacturing-weak states - Bihar and Bengal, for example - who have a large number of consumers.
"By and large, it is a win-win situation for both the centre and and the states," says Mr Subramanian.
Mihir Sharma, author of Restart: The Last Chance for the Indian economy, calls the GST "completely revolutionary, the sort of economic backroom plumbing that changes your life without you even noticing it".
But India's GST is also far from perfect.
For one, the tax will not be imposed on highly lucrative - and rent-seeking - alcohol, oil products and real estate industries.
Shrinking the ambit of the tax means giving up a good chunk of revenues.
A steep tax could easily make some goods and services expensive - the government apparently favours an 18% GST rate - and stoke inflation.
Differences could easily flare up between the centre and the states over tax-sharing arrangements.
Implementing the complex new tax system could be fraught with glitches.
Reports say only 20% of companies are actually getting ready for the tax.
Also, more importantly, GST, by itself, is no magic pill.
India's debt-saddled state-owned banks need to clean up their books and ease lending.
The government should move swiftly and imaginatively on creating jobs, boost agriculture and ensure social stability for long-term and inclusive growth.
Processing Re-write Suggestions Done (Unique Article)
India conjointly has to mop up tons additional tax - just one of Republic of Indians pay the tax and evasion is pervasive.
Successive governments seem to be helpless in reforming a corrupt tax-collection machinery.
But most believe that even associate degree imperfect GST law ought to lean an opportunity to succeed.
Revenue Secretary Hasmukh Adhia and economic advisor Arvind Subramanian say no country has claimed a unflawed GST since origination, and any and higher amendment in advanced systems is progressive.
Economist Vivek Dehejia agrees. He says: "The perfect ought not become the enemy of the good, especially as a less-than-perfect GST which can be improved down the road will be better than our current patchwork quilt of taxes, which prevents India from being stitched into a single market."
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