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For tracing purposes using the Taxpayer Business Service (TBS), postcodes are crucial in SA. »Ê¹ÚÌåÓýapp correct postcode is vital to ensure the links between the different frameworks are correct. New SA cases must be set up using a postcode plus a validated national insurance number (NINO) from form CWF1 or SA401 or SA402 or SA1. Form SA400 which is used to register partnerships will not contain a NINO.

Postcodes and the Abroad signal

A postcode cannot be entered where an Abroad signal is set.