IGST rate amendments notify revised service classifications and conditions affecting supplies and composite works contracts under GST framework. Amendments to the IGST rate notification revise classification and rates for numerous services, expand lower-rated or exempt construction-related supplies to include specified affordable housing and slum redevelopment schemes, and set valuation rules for composite supplies involving transfer or lease of land by deeming the land component to be one third of the total amount. The changes also impose conditions on input tax credit claiming for certain service supplies, clarify procurement-linked applicability where services are supplied to government entities, and insert and substitute multiple Table entries affecting works contracts, support services, transport hires, environmental services, entertainment admissions and real estate services.