I'd like to add a few more details, BookkeeperMKE.

As mentioned above, if your bank register balance in QuickBooks Online doesn’t match your actual bank balance, several factors may cause the balances to vary:

• Outstanding transactions
• New transactions for a connected account
• Duplicate transactions
• Edited or deleted transactions
• Credit card (liability) account

This article will help you understand the cause and how to resolve these issues: How to Fix Differences Between QuickBooks Balance and Bank Balance.

If your financial institution is connected, you will unlikely see the bank balance and QuickBooks balance match. Our program is dependent on what your bank shares. Each financial institution has different time increments when they send the transactions. Having said that, the reason behind this is timing. 

This is the same when you're manually importing transactions. It will not match since the bank balance will not be updated.

I'll add the reference on how to match and categorize bank transactions in QuickBooks Online. This will help you review these transactions after being downloaded or imported. 

You can also get QuickBooks-certified bookkeepers to help you manage balances and other tasks:
Check out QuickBooks Live.

If any questions arise, please feel free to leave a comment below.