Unreconcile an entire month

Unfortunately, only Accountants can "Undo" a Reconciliation in QBO at present. 

It is possible to undo a reconciliation manually, but it is one click at a time.

https://quickbooks.intuit.com/community/Banking-and-bank-feeds/How-to-unreconcile-a-transaction-or-undo-a-reconciliation/m-p/185924

Hi @alanna.

Welcome to the QuickBooks Community. I'll be happy to help you unreconcile an entire month.

Undoing a Reconcile is an accountant only feature, as you stated. The reason for this is so It's not done accidentally. If a user was to accidentally undo a reconcile it could put them back for a lot of work they've put in. 

An accountant linked to your QBO account can undo a reconcile in a few steps:

1. In QuickBooks Online Accountant and signed in as an accountant user, select the client from the drop-down list on the Toolbelt to open the client's company file.

2. Select the Gear icon on the Toolbar.

3. Under Tools, select Reconcile.

4. On the Reconcile an account page, select History by account.
5. On the History by account page, select the Account and Report period to locate the reconciliation to undo.
6. From the Action column drop-down list, select Undo.
7. When prompted to confirm, select Yes.
8. In the final confirmation window, select Undo.

9. Select Ok.

Note: Undoing a reconciliation automatically undoes any reconciliations that come after it chronologically, based on the Reconciled On date.

For more information on undoing reconciles, click here.

Please remember, I'm always here for any other questions or concerns.

Hello @Emlyn,

As of the moment, the feature to undo an entire reconciliation is only available for all Accountant users using their QuickBooks Online Accountant account.

With this, let's consider manually removing your transactions from reconciliation to undo them. Let me show you how.

1. Go to Accounting.
2. Select Chart of Accounts.
3. Find your bank account from the list of accounts.
4. Under ACTION, select View register.
5. Review your bank transaction.
6. On the Check column, remove the R status.
7. Click Save.

In the same manner, here's an article you can read to learn more about how you can undo a reconciled transaction: Undo and remove transactions from reconciliations in QuickBooks Online.

However, if you still wish to accomplish your goal easily as describe by the suggestions above, let's invite your accountant to access your company data. To do so:

1. Go to the Gear icon.
2. Under Your Company, select Manage Users.
3. Select Accounting firms.
4. Click Invite.
5. Enter the name and email address of your accountant.
6. Click Save.

On top of that, I've also included this reference for a compilation of articles you can use while working with us: Learn the reconcile workflow in QuickBooks.

If there's anything else that I can help you with, please let me know in the comments below. I'll be here to lend a hand.