If you booked directly through WDW Reservations over the phone (reservation number will be 12 digits) you can pay the balance of your reservation prior to arrival.
If you booked over the internet via disneyworld.com (reservation number is 8 digits beginning with the letter "r") you cannot make additional payments on the reservation prior to arrival.
I usually wait for to pay. I would rather have the funds generating interest for me rather than for Disney. They usually do a lump sum charge at the time of check out and that works for me. Maggie
If you booked directly through WDW Reservations over the phone (reservation number will be 12 digits) you can pay the balance of your reservation prior to arrival.
If you booked over the internet via disneyworld.com (reservation number is 8 digits beginning with the letter "r") you cannot make additional payments on the reservation prior to arrival.
I booked the room-only half of my last trip (Sept.-05) at disneyworld.com and even though I could not make payments online, I just called the Disney Travel Company number and they let me make payments no problem. I paid off the entire reservation several months early.