Gorn - What does your lawyer or accountant say. It sounds like the kind of commingling of funds that could pierce the corporate shield. You must already have a business bank account(s), just attach a paypal account to an isolated one of these.
*** Not a lawyer, no legal advise intended. ***
I have separate business bank accounts (I have to - I have an S-Corp.)
One of these business accounts (in the name of the corp) is a checking account that is dedicated to electronic payments like Paypal. It is the business account attached to Paypal.
I also have a personal checking account that is dedicated to Paypal also and is also attached to Paypal.
Within Paypal incoming or outgoing funds can be commingled. But I transfer any business related income out of Paypal directly to the business checking account.
It's up to me to see to it that this transfer of business related income to a business account takes place.
Like I said earlier, I have a paper trail of all such activity: I invoice the client in a certain amount, he pays via Paypal, and Paypal has a log of all incoming payments. I transfer that sum directly to my business account. The money is accounted for.
If I receive personal funds through Paypal (IE, donations toward this board), proceeds are deposited to my attached personal checking account; or I just leave the money in Paypal and I spend the money on something for myself. And I have a business credit card, as well as a couple of personal credit cards, attached to the Paypal account for the purpose of making business or personal purchases.
I see it kind of like a business owner who operates on a cash basis. Someone hands him payment for something from his business and he rings it up and deposits the cash in the bank account for the business (such as a store). Someone else, perhaps a family member, gives him a cash gift, or he receives cash in return for selling some personal item in the classifieds. He sticks that money in his wallet and he spends it directly on himself.
I see the way I am using Paypal like that.