Can I unreconcile an entire reconciliation? I accidentally entered the wrong year and QB hasnot reconciled 15 months of transactions.

Hello there, loveless.

Thanks for taking checking in with us. Let's get this taken care of for you.

In QuickBooks Self-Employed, there isn't an option to reconcile transactions. If you wish to correct it, you may want to delete the imported file and re-import the corrected one.

I'd be delighted to walk you through the steps on how to do it below:

1. Go to the Gear icon.
2. Under transactions, click Imports. 
3. Select the account where you imported the CVS file and click Import older transactions.
4. Select Import.

I've attached a screenshot for a better view.

To learn more about importing files, feel free to check out this article: Import transactions from other sources.

Just in case you encounter problems while importing, here's an article that you can refer: Self-Employed Import, export, and conversion limitations.

This should help you correct an entire reconciliation. Please let me know if there's anything else you'd like to know more about QuickBooks Self-Employed and I'll be sure to share additional information. You have a great day ahead.