Allocation of debt limits to foreign investors via bidding and FCFS enforces maturity, infrastructure eligibility, and utilisation rules. Additional FII investment capacity in government securities and corporate bonds (restricted to infrastructure issuers with residual maturity over five years) is allocated via competitive bidding and a first-come first-served window. Bidding rules set per-entity allocation ceilings, minimum bid sizes and tick sizes, and require authorisation where bids are made on behalf of multiple entities; FCFS allocations use a dedicated submission channel with a per-request cap and a non-utilisation charge tied to average successful bid premia. Utilisation and replacement timelines differ by instrument and route, custodians must confirm compliance and report fortnightly, and primary issue investments require committed listing within a short period.