I did this yesterday through PayUSATax.com; unsure if it matters but I tried in Google Chrome and it didn't give me the option of PayPal Credit. I logged in with Opera and it gave me the option. A tip I can also offer is to contact PayPal to give pre-approval prior to running the charge as I got it rejected the first time then got a text from their fraud department. After approving the charge, PayUSATax.com required me to wait 20 minutes before processing it again... if this happens to you wait 30 minutes and START OVER.
... View more