To get approved for a business credit card, you'll usually need a strong personal credit score–generally, the credit score needed for a business credit card is at least 690. The exception to this rule is corporate cards, which approve based on business revenue. All types of business structures are eligible to apply for a business credit card:

"What they try to do is see what they can do with those economics that are available to them now," Nelskyla says. This sometimes means passing the new, better rates on to borrowers but could also manifest through improved benefits such as a better cash-back offering.

Small business owners shouldn't view credit cards as a cost of doing business -- they're a secret weapon. See how credit cards help small businesses succeed.

Using a business credit card can help you access startup financing, build your business credit, manage cash flow gaps, organize your finances and earn rewards.

Small business cards are typically designed to meet the needs of small businesses, while corporate credit cards are better suited to the needs of corporations with millions of dollars in annual revenue.