I pay my bills on line with my bank and then I mark them as paid in QB. But, now I show duplicate payments? Plese call me on best way to fix and what to do in future.

I'll guide you on how to fix the duplicated payments, Cathy.

Duplicates can happen accidentally, or when you add downloaded transactions that you manually entered into the program. In your case, you mark the bill as paid by creating a bill payment. To prevent duplicates, you can match the downloaded transaction from your bank with the existing bill payment you made. Let me guide you on the steps.

1. Go to Banking.
2. Select your bank account.
3. In the For Review tab, click the bill payment.
4. Select Find Match.
5. In the Match transactions page, choose the transaction that matches, then click Save.

In addition, if you don't want duplicate payments when you pay your bills online, you don't have to mark it as paid and create a bill payment. The option you can do is to match the downloaded transaction from your bank to the open bill.  

Furthermore, you can run a report that will show all the money you paid to a vendor for the year. 

Also, you can check out this link to manage your bank feeds in the program: Categorize online bank transactions in QuickBooks Online.

I'm just a post-away if you need more help with your duplicate bill payments or anything else about QuickBooks by leaving a reply below. Take care and have a wonderful day!