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Do I need a business credit card?
I would suggest at least getting a personal card that you only use for business expenses, even if you don't opt for a business card.  It makes it very clear that expenses on that card are business expenses, and is just more professional.  The same goes for a checking account, if you have one of those.  It makes it easier to defend if you are ever audited, and if you use an accountant or tax preparer.