If the Reserve Bank of India (RBI) implements its draft guidelines on loan restructuring in the current form it would hike the banking sector's provisioning requirement by around Rs 15,000 crore between April 2013 and March 2015, Crisil Ratings said.

Crisil Ratings, India's leading credit rating agency, also warned that the central bank's draft guidelines would hit banks' profitability by 7 per cent to 8 per cent, as well as discourage them from large-scale restructuring.

The ratings agency added that the impact of higher provisioning would be greater on public sector banks (PSBs) because they account for a lion's share (nearly 85 per cent) of the total loan restructuring.

It also said that the new terms would augment stakeholders' confidence in banks' asset quality. In its latest report, the agency said, "These stipulations will enhance the confidence of stakeholders in banks' asset quality and discourage large-scale restructuring activity."

There could be a sharp hike in the reported NPA percentage from 3.6 per cent on September 30 last year to as high as 6.5 to 7.5 per cent on June 30 of 2015.

As per the RBI's draft norms, banks would require stepping up provisioning on old restructured loans by 100 basis points from the financial year 2014 to 3.75 per cent to 5 per cent by financial year of 2015 as against the existing 2.75 per cent norm.

Simultaneously, the central bank also issued the final guidelines on disclosure of restructured advances by banks, effective form financial year of 2012-13.