Welcome to the QuickBooks Community, northbynortheast.

Being able to set up a default account for vendors is unavailable in QuickBooks Desktop(QBDT) for Mac.

I'll take note of this and add it to our list of proposals. Our engineering team always looking for ways to improve our software. They might consider adding this feature in future updates.

In the meantime, you can visit our Product Update page. To stay current on the latest news and updates happening in QuickBooks.

I'll add this article so you have a guide on how to reconcile bank and credit card accounts(Mac).

Reply to this post if you have further questions about your account. We're always here to help you. Have a nice day!