Stamp duty exemption for SEZ transactions: States may exempt or refund duty on land linked to SEZ approvals. An amendment via the SEZ Act exempts from stamp duty instruments executed by, on behalf of, or in favour of SEZ Developers or Units for SEZ purposes. Guidelines clarify that land acquired after formal approval should receive full exemption; acquisitions after in principle approval may be exempted or refunded; acquisitions before in principle approval require upfront payment with possible refund on notification. Exemptions apply only to land and transactions within the notified SEZ; outside SEZ purchases, sales or conveyances do not qualify, and States may recover duty if SEZ is not commissioned or notification is cancelled.