We have just migrated from Sage 50 to Quickbooks Online. When I go into 'Pay Bills,' it is showing that all of our expenses from back to 2020 are outstanding. How to fix?

Let's make sure you're able to resolve the outstanding bills to pay in your account after migrating from Sage 50, -anchoredconstru.

If your bills show up in the Pay Bills section, this means that it wasn't linked properly with its payment. For this, open the vendor's profile and check how the payments was recorded. Was it a bill payment, a check or an expense?

If it wasn't converted as a bill payment, this is most likely the reason why it shows outstanding. It happens because there is no payment applied to the Accounts Payable account, because the system converted the transactions differently. 

To fix this, you can mark the bills paid in the Pay Bills window and delete the other recorded payments to avoid duplicate A/P balances. If not, you can delete the bills and retain the payments from Sage 50.

Please let me know if the payment is successfully linked. Thanks.