What will be done with the Fee Sheet in a PCT Application considering the fees will be deducted from my deposit account during the filing process?

The RO/101 Annex (Fee Sheet) is retained in the application file. If the fees paid online are insufficient and the Fee Sheet includes proper authorization to charge fees to a specified deposit account, the Fee Sheet will be used to charge the deposit account to the extent authorized therein.

USPTO FAQ - Questions and Answers (2007JUN01)