Hi @almostthere!
You can apply the bank rule to past transactions. Let me assist you.
The bank rule is designed for the uncategorized or unaccepted transactions on the For Review tab. In order to apply it to the past entries, you'll need to undo or unmatch them so they'll be moved back to the For Review tab.
When you undo them, it can affect your accounts especially if they are reconciled. And yes, you'll need to reconcile them again once you add them back to your books.
If the purpose why you want the bank rule to apply to these transactions is to move them to a different account, I suggest you reach out to your accountant. They have an option to reclassify or move multiple transactions at once.
Lastly, you can check the reconciliation workflow through this article: Learn the reconcile workflow in QuickBooks. This will show you not only how to reconcile, but also how to fix reconciliation issues.
I'll be glad to assist you if you need more help with banking. Take care!
