On what basis is the Interest charged to the clients?

In cash segment the clients are charged interest on T+2 basis (On debit amount) and in FO, Currency on T+1 day basis and in NCDEX & MCX segment on T day basis @ 19% p.a.for the outstanding Balance. In FO, Currency, NCDEX & MCX segment interest is calculated on ledger basis as well as on Margin shortfall, whichever is higher.