IGST rate notification for real estate construction prescribes differentiated rates, ITC adjustment formulas and reverse charge compliance. The notification prescribes IGST rates for varied real estate construction services and sets project wise rules to compute eligible Input Tax Credit (Te) and ITC reversal or payment (Tx) for REP and RREP. It differentiates treatment by apartment category, requires promoters to maintain project accounts, mandates payment on shortfalls from unregistered suppliers (including reverse charge on certain inputs), and provides a one time option mechanism for ongoing projects to opt into alternative tax rates, with detailed formulas, caps and reporting obligations.