Maharashtra hosts the largest concentration of registered taxpayers, and its state machinery is correspondingly active: the Maharashtra GST Department runs frequent return-scrutiny drives, so declarations certifying filing regularity are checked against actual portal data more often than elsewhere. Businesses with units in Mumbai and Pune under a single PAN hold separate GSTINs per State, and a declaration must name the specific registration it covers, not the group. The intra-state e-way bill threshold of Rs. 1 lakh, higher than the national Rs. 50,000 default, also shapes the logistics declarations Maharashtra suppliers attach to despatches.
Delhi presents the classic multi-jurisdiction problem: a single business often bills from Delhi while warehousing in Haryana or Uttar Pradesh, and buyers ask for declarations confirming which GSTIN will appear on invoices for each supply. Delhi's enforcement wing has been aggressive on fake invoicing networks, which is why Delhi counterparties increasingly insist on the indemnity clause and verify the declarant's filing history before releasing credit terms.
Karnataka and its Bengaluru technology corridor generate the bulk of service-export declarations. Software exporters file the RFD-11 undertaking annually and furnish parallel declarations to clients confirming zero-rated treatment of supplies to SEZ units under Section 16 of the IGST Act. The Karnataka Authority for Advance Rulings has produced several divergent rulings on intermediary services, so exporters there often annexe a declaration of the precise nature of services to pre-empt classification disputes.
Gujarat combines heavy goods exports with a dense MSME base. Manufacturers in Ahmedabad and Surat lean on the LUT route to keep working capital free, and their buyers commonly request composition-status declarations from job workers in the textile chain, where the Section 10 scheme is widespread. Gujarat's officers are exacting on the three-month export window under Rule 96A; a declaration there should be backed by shipping bill discipline, not optimism.