Dear Sir,
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The concessional rate of GST of 8% is applicable for houses constructed or acquired under the CLSS for Economically Weaker Sections (EWS) / Lower Income Group (LIG) / Middle Income Group-1 (MlG-1) / Middle Income Group-2 (MlG-2) under the Housing for All (Urban) Mission/Pradhan Mantri Awas Yojana (PMAY Urban).
If your house falls under above categories then the rate is 8% otherwise 12%.
We may help you in entire procedure.