With 86 per cent of the currency in circulation being swept away with the ban on 500 and 1,000 rupee notes, households and businesses will experience liquidity shortages for a few months, it said, adding demonetisation will "weigh on GDP growth for a few quarters, dampening government revenues."
But in the medium term, higher income declarations by way of deposits of banned notes will boost tax revenues which will support government's capital expenditure programme and support fiscal consolidation, it said.
"Although the measures in the near term will pressure GDP growth and thereby government revenues, in the longer term they should boost tax revenues and translate into higher government capital expenditure and/or faster fiscal consolidation," Moody's Sovereign Group Associate MD Marie Diron said.
Moody's added there will be loss of wealth for individuals and corporates with unreported income, as some will choose not to deposit funds back into the formal financial system to avoid disclosing the sources of these funds.
Also Read
Households and businesses will experience liquidity shortages as cash is taken out of the system, with a daily limit on the amount in old notes that can be exchanged into new notes.
"Corporates will see economic activity decline, with lower sales volumes and cash flows, with those directly exposed to retail sales most affected," Moody's Corporate Finance Group MD Laura Acres said.
However, greater formalisation of economic and financial activity would ultimately help broaden the tax base and expand usage of the financial system, which would be credit positive, it added.
On November 8, Prime Minister Narendra Modi announced demonetisation of 500 and 1,000 rupee notes, thereby withdrawing 86 per cent or Rs 14 lakh crore worth currency from circulation.
Moody's said implementation challenges, in addition to affecting growth and government revenues, will impact corporates by lowering sales volumes and cash flows.
In the medium term, the impact on corporates will depend on how quickly liquidity returns to the system and transaction flows are restored, it added.
The US-based agency said the government could prevent the same amount of cash returning into the system, in an effort to increase the use of non-cash transactions and digital payments.
Consumption in India is still largely cash-driven, and a move towards digital payments would require a likely gradual change in consumer habits.
Banks would benefit significantly from a move towards digital payments, given their role as intermediaries for such transactions, Moody's added.
Rising bank deposits -- which Moody's expects to increase by 1-2 per cent as a result of the demonetisation -- could lower lending rates, a positive for the banks.
"A prolonged disruption could also have a more significant impact on asset quality, as both corporate and small-and medium-sized enterprise customers have a limited ability to withstand a sustained period of economic weakness," Moody's said.