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BSI stands for Business Software Incorporated.

BSI is a SAP partner that provide the US tax software engine that is used with payroll.
The BSI website is
Detailed contact information can be found in SAP note:
723946 BSI TaxFactory support

Latest information about TUBS delivered by SAP you can find at

When you need to open a message to SAP refer to the component PY-US-BSI.

Informations to BSI:

BSI - Getting Started

BSI interface calculations

BSI Interface codes - What they mean

BSI - Nexus Indicator

BSI overrides

BSI TaxFactory 9.0

BSI TaxFactory Dataset refresh (From one dataset to other)

Cascade transports from client 000