As Tax Expert @CassandraLO notes, TurboTax does not accept PayPal. TurboTax accepts credit, debit, and pre-paid cards with a Visa, MasterCard, American Express, or Discover logo. Like many other U.S. online merchants, TurboTax can only process cards with a U.S. billing address.
A second option is to pay with your federal refund, also known as Pay With My Refund (charges may apply).
We're unable to take check, money order, or cash payments.
If this is true then the Turbo Tax payment method built into Turbo Tax should probably not have an option to select, and thus in theory use, Pay Pal for payment.