Summary: You do not need a GST number to purchase goods. Whether you pay GST depends on if the seller is registered and if the product itself is taxable. Unregistered sellers (often small-scale farmers or artisans) are not required to charge GST. If you are a business, buying from an unregistered seller means you cannot claim Input Tax Credit and may need to evaluate potential Reverse Charge Mechanism (RCM) liabilities.