About Document Management Introduction The document management functionality of SIGTAS enables the revenue department to efficiently monitor and organise all incoming and outgoing documents relating to taxpayers. Registering a document in SIGTAS Each document that is originally produced by SIGTAS and returned by a taxpayer was already assigned a document number at the time of its creation. Documents not produced by SIGTAS (either sent directly to the revenue department by a taxpayer or produced manually by the tax department) are registered in SIGTAS and assigned a document number. This document number should be placed on the document at the time of its registration into SIGTAS. Registering a document into a file Files are created in SIGTAS for each corresponding physical file folder that holds a taxpayer’s documents. When the revenue department has processed a document and it is ready to be filed away, it is registered in SIGTAS as being part of a file.