Article 54 specifies the conditions under which a Taxable Person must apply for VAT deregistration. This is mandatory upon ceasing economic activity, ceasing to make Taxable Supplies, or if the value of their supplies falls below the Voluntary Registration Threshold as per Article 51. The Article also permits a Taxable Person to apply for deregistration if their annual revenue falls below the Mandatory Registration Threshold but remains above the voluntary one. It grants Member States the authority to set a minimum registration period and define other conditions for rejecting applications or deregistering persons in alternative scenarios.