I can see how updating multiple transactions at once to add tax could simplify your workflow, mka.
While batch editing posted transactions to add tax for thousands of transactions at once isn't available, we encourage you to submit your feedback requesting this functionality.
Let me guide you through the process of submitting your idea:
- Navigate to the Gear icon in the upper right corner.
- Under the Profile column, choose Feedback.
- Enter your feedback suggestion.
- Click the Next button.
Stay informed about the latest product developments by regularly checking Intuit's Product Updates webpage.
Please comment below if you have any other questions or require further assistance.