Delinquency rate is a key measure of the quality of outstanding loans of banks and other non-banking lenders.
"Delinquencies by number of accounts have further increased by 33 per cent, from around 3 per cent to around four per cent of accounts from June 2013 to January 2014," Equifax said in a statement.
Last year, delinquencies by number of accounts had increased by 20 per cent, from around 2.5 per cent to around 3 per cent of accounts from June 2012 to December 2013, it added.
Equifax is a joint venture between the US-based Equifax Inc and seven financial institutions- SBI, BoB, BoI, Kotak Mahindra Prime, Religare Finvest, Sundaram Finance and Union Bank.