account is balanced but why is QB bank register lower than true bank balance?

Thank you for engaging with us in the Community forum, @deecooper. I’ll share the reasons behind the differences between your Bank balance and your Register balance.

Several reasons cause the difference. You can check the lists below:
 

1. Outstanding transactions- These are those recorded in QuickBooks that have not yet cleared your bank, potentially causing discrepancies.
2. New Uploads- Transactions uploaded to your connected account after reconciliation can affect the balance.
3. Edited or Deleted Transactions- Changes made to transactions after reconciliation can cause differences.
4. Credit Card (Liability) Account- Transactions related to credit card accounts can also impact the balance.

To fix this, I recommend matching and categorizing all your downloaded transactions and making all the necessary corrections to your entries. You can use your bank statement as a reference when performing these procedures. For the complete guide, please see this article: Fix issues for accounts you've reconciled in the past in QuickBooks Online.

Additionally, you can review the Audit log section to identify any changes made before and after the reconciliation that might have caused the balance discrepancy. Here's the procedure:

1. Select Audit log from the Settings tab.
2. Click the Filter tab.Void or delete transactions in QuickBooks Online
3. Choose the correct User, Date, or Events filter to narrow the results.
4. Then, click Apply.

For more details, check out this article: Use the audit log in QuickBooks Online.

To amend the reconciled period, you can reverse the reconciliation process. For further details, refer to this article: Undo or remove transactions from reconciliations in QuickBooks Online.

I'll also share this article to learn how to delete or void the transactions added: Void or delete transactions in QuickBooks Online.

I'm here to listen if you have any other concerns about managing your Bank and Register balance in QBO. Feel free to leave a comment below, and I'll be happy to assist. Take care, and have a good one.