Seperate credit card for rentals?

[Rich Thomas]

Hello, I currently own 6 units total, I have a seperate checking account 'Investment property' that all money produced from the rentals goes into and does not co-mingle with my personal checking. Bills for the properties also get paid with this 'investment property' account. My question is do I need to have a seperate credit card for these properties? Most things that I buy on a daily basis for these properties I just charge to my credit card and then pay off with the checking acct for the property. I also use the same credit card for personal use....is this an issue come tax time if audited? I make sure to keep and seperate evey single reciept for each respective property... Thanks!