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All businesses require some degree of credit financing, and one of the most common forms of business revolving credit lines is no more strange than the common business credit card. Business credit cards are extremely useful tools, not only for the purposes of small term financing, but also for the purposes of building credit, and getting all the cool stuff that you can get with a business credit card. Having a business revolving credit line such as a credit card is very easy to do, as long as you have your business set up upon a solid legal foundation.
Setting up a business revolving credit line will require you to first have a solid account with the credit monitoring boards. You will need an EIN (which is something that you will get after you have filed your LLC or C-corp with the IRS), a dedicated phone line and bank account to the business itself, and a few visible merchant trade lines so that the businesses can see what you are doing. Getting a business credit profile will require a quick call to Dun & Bradstreet or one of the other credit bureaus.
After that you can start applying for various kinds of business credit cards. Business credit cards often require some form of collateral if you are setting yours up for the first time. The business credit cards that you get will be limited otherwise. Generally it is best to set these systems up through the possession of a secured credit account, which will guaranteed that your revolving credit is tied exclusively to your business credit and will leave your personal credit alone completely.