Business credit cards and charge cards are designed for small to medium sized companies. The only extra eligibility requirement (when compared with a personal credit card) is that you need to have an ABN. If your business is not incorporated, you will be personally liable for the debt. If your business is incorporated, the liability may be shared between you as a person and your business as a separate entity, or it may be a liability solely for the business. Where supplementary cards on a business card account are issued to employees, the employee may also have some liability for the spending they make using their card.
Corporate cards are intended for larger businesses. In the case of American Express, all of its corporate cards are charge cards, and Amex states that they are designed for companies with a turnover of $10 million or more. The cards are only issued to incorporated businesses, and the business has sole liability for the debt. The name of each individual employee to whom the card is issued will appear on his or her card, as well as the name of the company.