A company stamp is optional, but there will be times when it is required, such as when it comes to government documentation, utility or telephone bills and even courier companies which may be require an official company stamp for authorization purposes. Other instances where a company chop may be required include:

• Grant applications
• License application
• Signing of purchase orders
• Rental agreements
• Business contracts
• Official invoices
• Statement of accounts
• Bills of exchange
• Promissory note