I put an incorrect end date on my bank reconciliation. Is there a way to correct it?

Hello there, @ckaccounting.

If you need assistance altering the reconciliation year date in QuickBooks Online, you've come to the correct place.

The procedures below are to change the reconciliation ending date if you haven't finished the reconciliation.

Here's how:

1. Click Accounting in the left panel and select the Reconcile tab.
2. Choose the bank account from the Account drop-down list.
3. Tap the Resume reconciling button.
4. From the upper right-hand corner, click the Edit Info button.
5. Change the reconciliation year date from there.
6. Hit Save.

Furthermore, to edit the reconciled transaction, undo all the transactions by clicking the R status to C. This way, all the transactions will show on the reconciliation page. Once done, you need to reconcile them again.

Follow the steps below:

1. Go to the Gear menu and click Chart Of Accounts.
2. Choose the bank account you want to un-reconcile and click the blue View Register hyperlink on that row.
3. Find and select the transaction you need to unreconciled.
4. Look in the column just to the right of the Deposit column. This column is the Reconciliation Status column.
5. To undo the reconciliation of this transaction, click the R (for reconciled) until the field is blank.
6. Click the green Save button.
7. Now find and select the transaction.
8. Click the blank or C (for Cleared) to R (Reconcile).
9. Click the green Save button.

Moreover, you will need to undo the reconciliation and change the year date if you have already concluded the process, only QuickBooks Online Accountant has the Undo feature. I would advise bringing your accountant in to undo the whole reconciliation period.

Here's how:

1. Click the Gear icon in the upper right corner, and select Manage Users.
2. Go to the Accounting firms tab, enter the accountant's email, and click the Invite button.
3. Hit Save.
4. Once invited, have your accountant undo the whole reconciliation.

If you run into any mistakes when reconciling your accounts, the article will show you how to repair them: Fix issues at the end of a reconciliation in QuickBooks Online. 

If you need any additional help with reconciliation, ping me over. I'll always be available to assist.