"We will strive to restock ATMs at the earliest and make them operational. The Government has given enough exemptions to ensure urgent needs are met. We will work round the clock to ensure that customers have a smooth experience," State Bank of India chairperson Arundhati Bhattacharya said.
She said the banking system has handled such demonetisation in the past as well and will do so again this time. Banks will be closed on Wednesday to withdraw existing Rs 500 and Rs 1,000 notes from counters and ATMs (automated teller machines).
ICICI Bank chief Chanda Kochhar said, "It's perhaps the most significant move ever taken to curtail the parallel economy. It will give a sharp boost to all formal channels of payments which in turn will help the formal economy to grow at a faster clip in the long term."
"It is a big reform which no one expected and will have a huge impact on people who are hoarding money and not disclosing money for tax purposes," said Deepak Parekh, chairman of mortgage major HDFC.
He said the realty sector, which depends a lot on cash transactions, may be impacted and construction activity can also slow down, but underlined that it is a pain worth taking in the short term for long term gains.
Mahindra Group vice-chairman Anand Mahindra tweeted, "Success required an element of surprise and it's incredible that this master stroke was kept confidential."
In a lighter vein, he added, "Urgent message to anyone who robbed a bank tonight: You just got robbed..."
Sajjan Jindal of JSW Group termed the move as an "amazing and very brave step to curb black money". He also complimented Prime Minister Narendra Modi, who made the announcement on demonetisation of Rs 1,000 and Rs 500 notes in a televised address to the nation, for the bold step.
Nirmal Jain, chairman of IIFL, an NBFC, said the move "is a very powerful measure to curb black money. The Prime Minister has kept his promise of taking stern measures against black money. It was done some 30 years ago and since then a huge build-up of unofficial money had happened."
On the larger impact of the move, he said it will have deflationary impact in general and more specifically on real estate prices and make homes affordable. It is also indirectly a boon to honest tax payers.
HDFC vice-chairman Keki Mistry termed the decision as "a bold" one which can go a long way in containing black money, though effective implementation in the short term may be a challenge.
Mr Mistry of HDFC said if handled properly, it can unearth huge volumes of black money which can help bridge the fiscal gap as the government's revenue collections can go up.
Hailing the development as a "great move", Vedanta group chief Anil Agarwal said it would make corruption minimal.
"There cannot be a better move and India will see its results. The rupee will become strong and I have a strong feeling there will be investment in growth in the right direction," he said.
Naushad Forbes, president of industry chamber CII, said demonetising high denomination notes can be an effective means of checking accumulation of wealth in cash.
"The government has taken a measure aimed at the heart of the black cash economy. CII congratulates the Prime Minister and the government for this step. Not only is the measure important but it requires extensive preparation for effective execution," he added.
India Ratings chief economist D K Pant said this measure, coming after the Income Disclosure Scheme - which closed on September 30 - is targeted at curbing black money.
"There may be some inconvenience to general consumers in short-run, however, this inconvenience is worth for long-term gain," he said.
Paytm founder Vijay Shekhar Sharma, whose company offers the much-needed alternative for the cash economy, said it is the "best move" which will boost digital payments.
Veteran investment banker Vallabh Bhansali termed this as the "third freedom struggle" after the Independence movement and the liberalisation of 1991, and a voluntary disclosure scheme in disguise. He also described it as a "revolutionary" step.
Indiabulls Housing Finance vice-chairman Gagan Banga said, "It's very good for housing finance companies as the element of cash will go down and demand for formal credit will increase."
CJ George, managing director of Geojit BNP Paribas, described this as the creation of Swachh Bharat in one stroke of a pen.
MP Ahammed, chairman of Malabar Gold, dubbed it as a "bold and decisive step towards a cashless economy".
FICCI president Harshavardhan Neotia described PM Modi's decision as "an extremely bold move" and will have a debilitating impact on the parallel economy in the country as well as deal a body blow to terror financing.
He further said, "FICCI completely supports this move of the Government and complements it for its continuous and comprehensive measures to deal with the issue of black money in the country."
Mr Neotia, however, said there could be some inconvenience that this change may lead to for the people of our country for a few days.
"However, we are sure that government and RBI will take adequate measures to ensure the transition happens smoothly," he added.
Bandhan Bank CEO and founder C S Ghosh said that the decision to demonetise Rs 500 and Rs 1,000 notes would cause problems to small traders and common public.
"The decision to declare Rs 500 and Rs 1000 notes invalid from this midnight is a welcome move. But this will cause inconvenience to small traders and public who mainly deal in cash," he said.
Chairman of Ambujaneotia group Harsh Neotia said: "Although it is not considered opinion, it is a welcome move."
Commenting on the immediate direct impact of the step to demonetise the Rs 500 and Rs 1,000 notes, Mr Parekh said: "I expect price of real estate to come down. One expects the price of real estate should come down in medium term."
The biggest cost in the Indian real estate sector has been land cost. Corruption is another reason why prices in real estate are high. Corruption should also come down, he added.
Former RBI deputy governor Usha Thorat stressed that the biggest benefit of this would be moving towards less cash economy.
"It's a move towards cash less society but there should not be a panic situation...Common person would be worried more about day to day transaction," she said.
NBFC player IndoStar's managing director, Vimal Bhandari, said the government's move will have a very far reaching impact, as this is the largest ever such exercise in the country.
When then PM Indira Gandhi had done away with the Rs 1,000 bills in 1969, the economy was too small to have feel any serious impact. But this time the immediate impact will on business due to liquidity.
"The will disrupt the economy very badly as there is too short window for conversion," Mr Bhandari said.
While welcoming the measure, head of forex player Centrum Direct Hariprasad said that though it will have negative impact on the rupee in the short run, it will be good for the local unit in the long term. "However, in the short run it will impact the economy due to uncertainty and lack of clarity on the proposed steps."
Realtor Rohit Gera of Gera Developments said whose businesses will have radical impact from the development, said the move will help eliminate corruption and black money.
"We welcome the Government's bold and courageous move to weed out black money, which will have significant long term benefits for the economy. With this, the quantum of India's economy moving through the digital pipes will witness massive growth. Both Snapdeal and FreeCharge are committed to supporting all such initiatives," Snapdeal co-founder and CEO Kunal Bahl said.