Regardless of how you do it, your CPA probably will advise you recordredactedor a nominal amount) as equity and the remaining as shareholder loan. As others have said, it is cleaner if you transfer the funds into your entity first, though it is not a requirement.

Thank you all for your thoughts - I did end up moving funds to a business account and paying for the transaction from there, we closed on Monday. And I am now the proud owner of a local ice cream shop! A special thank you to Jamie Gallagher - your comment about looking at wire transaction limits was very helpful, as it turns out my personal account had too low of a limit to send the amounts I needed. Had I not known to check into that a few days ahead of time, closing day would have brought a very unwelcome surprise.