A003 is a standard SAP Table which is used to store Tax Classification data in SAP systems, such as SAP R/3, S/4HANA, depending on the version and release level.
The A003 table consists of various fields, each holding specific information or linking keys about Tax Classification data available in SAP. These include KAPPL (Application), KSCHL (Condition type), ALAND (Departure country (country from which the goods are sent)), MWSKZ (Tax on sales/purchases code)... See below for full list along with technical details, documentation, text table, check tables, foreign key relationships, conversion routines, relevant tcodes and example ABAP select code etc. .