Under Section 51 of the CGST Act, above what contract value is a notified government deductor ordinarily required to deduct GST at source, assuming other conditions are met?

Under section 51(1) of the CGST Act, a notified deductor deducts tax at source where the total value of supply under a contract exceeds ₹2,50,000, and the explanation excludes central, State, Union territory and integrated tax and cess shown in the invoice from that value. A figure inclusive of tax is therefore not the test.