Input tax credit: restriction and apportionment rules limit credit where supplies are partly exempt or non-business. Input tax credit is restricted to the portion attributable to taxable business use where supplies are used partly for business and partly for other purposes, or partly for taxable and partly for exempt supplies; the value of exempt supplies for apportionment is prescribed and includes reverse-charge supplies, securities transactions and certain land and building supplies. Specified categories of inputs and services are blocked from credit, and the Government may prescribe methods for attribution; banking and financial institutions have an alternate monthly option to claim a fixed proportion of eligible credits subject to conditions, with the option irrevocable for the financial year.