It is not 100% certain that you will be able to get a credit line through your credit card, having said so it is one of the most common paths followed by new business owners. If you are starting a company it is very likely that you won't have the required credit history as a company to apply for most common borrowing products at a bank. By getting a credit card you can start paving the road towards more complex products. The idea behind doing this is to improve and build your credit score with the intention of gaining access to other products and services in the future.