However, Nasscom said the exact nature and extent of the impact - if "Brexit" happens - will emerge over a longer period of two years or more.
Brexit refers to the possibility that Britain will withdraw from the European Union with the in-out referendum on its EU membership to be held on June 23. The UK would have two years to figure out the exact terms of the nation's departure.
"An initial analysis indicates that the impact on India's technology sector may be mixed; clearly negative in the short term and harder to discern in the longer term - with either scenario having some positive and some negative points," Nasscom said.
Leading IT firms like TCS, Infosys, Wipro and HCL Technologies did not comment on the issue.
A Tech Mahindra spokesperson said the company will "wait and see what the outcome of the referendum is" and then assess the situation.
According to reports, Indian IT companies get anywhere from 6-18 per cent of their revenues from the UK. The UK has traditionally been the gateway for Indian IT firms to enter Europe and they have set up a large presence in the UK to serve the EU markets from their headquarters in London.
Also, the immediate fallout of Brexit on the IT industry in India would be the impact of any possible decline in the value of the British pound, which would render many existing contracts losing propositions unless they are re-negotiated.
In the longer run, Brexit could help strengthen India-UK economic relationship as the UK seeks to compensate for loss of preferential access to EU markets.
immigration into the UK, it could become more open to high-skilled immigration from other non-EU countries including India, it added.
However, in case Britain decides to stay a part of the EU, the IT industry would need to contend with easy intra-EU migration of skilled workers from India into the UK, since it may continue to be dealt with as an immigration issue and not a trade issue.
"In this scenario, in spite of a felt need for skilled workers from overseas, including India, such immigration may remain a lower priority below intra EU and political asylum linked immigration, thereby adversely impacting the IT industry in India," Nasscom said.
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