Cancellation of registration: grounds include discontinued business, non filing or fraud, with tax liabilities and input credit reversal preserved. The proper officer may cancel registration on own motion or application for reasons such as business discontinuation, change in constitution, cessation of liability, contraventions, prolonged non filing, failure to commence business after voluntary registration, or fraud, with cancellation permissible from any date subject to an opportunity to be heard. Cancellation does not affect liability for tax or other dues for periods prior to cancellation; central law cancellation is deemed to operate under this Act. A cancelled registrant must pay an amount equivalent to input tax credit on stock or the output tax on such goods, with a prescribed reduction for capital goods and prescribed calculation methods.