Securities Transaction Tax integration in STP messaging requires new COUN qualifier and placement before settlement amount. Integration of the Securities Transaction Tax into STP messaging requires an AMT block using qualifier 'COUN' to identify the STT amount in the format qualifier//currency code amount; the AMT block is to be placed before the Settlement Amount block, mandatory in IFN515 and optional in IFN540, IFN541, IFN542 and IFN543. Rejection of IFN515 on STT amount must record reason in Tag70D Narrative with Tag24B set to 'NARR'.