"Full financial inclusion will require a capital expenditure of USD 500 million and an additional USD 1.3 billion in recurring annual operational expenses.
"The recurring service cost is about 0.1 per cent of GDP or 0.05 per cent of deposits and loans in the banking system," it said.
Pointing out that total financial inclusion could be achieved with an investment of less than 0.1 per cent (USD 1.8 billion) of the GDP which was USD 1.8 trillion in FY13, it said that this investment would deliver a return of up to 0.9 per cent of the GDP per annum.
It described benefits of the Aadhar card, mobile banking and business correspondents model as a "transformational trinity" to achieve financial inclusion.
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Pointing out that overall cost of financial inclusion is "manageable", it said that 100 per cent financial inclusion would require setting up 6 lakh customer service points which could service an additional 567 million new accounts which would have to be opened.
The commentary comes days ahead of the announcement of a comprehensive financial inclusion plan scheduled to be made by Prime Minister Narendra Modi on August 15.
It also comes a day after RBI Governor Raghuram Rajan stressed on the virtues of undertaking such a drive, saying it that it would help fight corruption.
Barclays said that lack of identity documentation, the key to fulfill know your customer (KYC) requirements and transaction costs are the "key barriers" to financial inclusion.