One of the possible reasons why there are duplicate transactions in your Bank register is that you've recorded transactions within QuickBooks and add them from the Banking page. Since deleting them within the bank register doesn't work, you can undo the added transactions and match or exclude them from the Banking page.
Here's how to undo transactions:
Click Banking from the left menu.
Select the appropriate bank account.
Go to the Categorized tab, then find the duplicate transactions and click Undo under the Action column.
Once done, the transactions are now moved to the ForReview tab. Then, you can now match the transactions or exclude them. This way, it'll get rid of the duplicate transactions in your bank register.
After removing all the duplicate transactions from your bank register, you can now proceed with reconciling the account. For more guidance, feel free to check out this article: Reconcile an account in QuickBooks Online.
Should you need any additional assistance while managing your bank transactions, you can leave a comment below. I'll be sure to get back to you.
I have several transactions that were doubled in my bank register. I try to unmatch and delete them, but they come back. How do I delete permanently?
I have the same problem and the duplicate transactions keep appearing again. The duplicates are NOT reappearing in the categorized area, only in the check register. So this suggested solution does not help me.
Here is a more complete description:
I have a new data file where all data (from check and credit card accounts) has been downloaded from the banks. I have manually created nothing. When making and then revising categorizations, QuickBooks Online somehow created duplicate transactions that appear in the bank register but not the review area. Some of the duplicates were "matched" and some of the discussion said you cannot delete matched transactions (I could but they keep reappearing when the link to the bank gets updated). So I removed the matches and then deleted the duplicates. Then with the next update all the deleted duplicates reappeared. This has now happened several times.
Again, the duplicates do not appear in the review area so there is nothing for me to "exclude" there. And again, I have manually created absolutely nothing, all data in my new file was created by downloading the data from the bank and me classifying the transactions (and QuickBooks somehow creating duplicate entries).
Any help would be appreciated. If I can't get this solved I need to dump Quickbooks Online because this situation is intolerable.