"The decisions have been taken and executive order and notification would be issued in a day or two. Broadly the underlying philosophy of small savings rate changes is to make the rate more frequently market aligned, make it as closely market aligned as possible," he said.
Small savings rates are linked to Government Securities' and readjusted every year, he said, adding that now they will be a adjusted on quarterly basis.
"First effect of these changes will take place from 1st of April. They will be reset from 1st April," he said.
Smalls saving schemes include Post Office Monthly Income Scheme (MIS), PPF, Post Office fixed Deposit Scheme, Senior Citizens Savings Scheme, Post Office Savings Account and Sukanya Samriddhi Accounts.
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"At the same time, taking into consideration the interest of small savers and some important social sector measures of the government, the rates under the girl child scheme, the senior citizen scheme...They will continue as it is. They will have quarterly adjustments but whatever spreads they have over the G-Sec rates will not be altered," he said.
Asked if the banks would pass on the benefit of the rate cut to customers, Das said RBI has cut policy rate by about 125 basis points since January last year while banks have passed on only 70 basis points.
"Banks are free to decide on the interest rate. It is for banks to decide by what basis points they will cut interest," he said.
Even RBI Governor Raghuram Rajan had said the rate reduction on small savings like PPF and Post Office deposit is also going to bring down the cost of fund for banks.
"The government is considering small saving rates and tying them more to market interest rates. I think these actions will help (effective monetary policy) transmission," Rajan had said.