The Financial Services Agency will conduct a followup audit of major banks' books by Sept. 30 to ensure they register loan-loss charges in accordance with FSA inspectors' earlier findings on the quality of their loan portfolios.

The on-the-spot checks will concern the 15 major banks whose books were examined by FSA inspectors in the past year, the FSA said Monday.

FSA Commissioner Shoji Mori suggested that the followup is aimed at boosting the confidence of foreign investors and governments in the accuracy of loan-quality assessments by the FSA.