To determine if your payment through Pay1040 was successful, you should receive a confirmation notification via email shortly after the transaction is completed. This confirmation typically includes details such as the payment amount and a transaction reference number. Additionally, you can log into your Pay1040 account to view your payment history, which should reflect the status of your recent payment transactions. If the payment is listed as completed or successful in your account history, that is a good indication that your payment was processed properly. In case you do not receive a confirmation or if there are discrepancies, it is advisable to check the current web page for relevant contact information for further assistance.