Thanks to all! This saved me a lot of time and frustration. PayUSAtax.com didn't want to accept my Chase Business Premier Ink card, either. The Paypal loophole worked.
For others - use this card to get 2.5% cash back, still money ahead after paying the 1.85% convenience fee. Plus, qualifying for a $1000 cashback bonus.
C.Mac
Lexington, KY