There is the following impact on business if registration is cancelled
As per section 16(1), only a registered person can claim the ITC of their inward supply if registration has been cancelled, he shall not entitled to claim the ITC and it will lead to extra cost to business.
As per section 32(1) of the CGST act, "A person who is not registered shall not collect in respect of any supply of goods or service or both any amount by way of tax under this Act.
As per section 76 of the CGST act, every person who has collected from any other person any amount as representing the tax and not paid to the government after considering any representation made by him determine the amount dues from him and thereupon he shall pay the amount so determined and also pay interest thereon at the rate specified under section 50 from the date he collected such amount to the date he pays such amount to the Government.
As per section 125 of the CGST act, Any person, who contravenes any of the provisions of this act or rules made thereunder for which no penalty is separately provided for this act, shall be liable to a penalty which may extend to twenty-five thousand rupees.
Therefore, as per the analysis of section 32, a person without a registration certificate can not levy the GST and is liable to penalty under section 125 of the CGST act as an unregistered person levies GST which is in contravention of section 32 of the CGST act and also as per section 76 if a person fails to pay the government any amount that is collected as a tax shall be liable to pay such amount with interest thereon.