If you use typical notes based on FNMA, it would not be "paid ahead" regardless of how it is set up in your system..
I may make a full Prepayment or partial Prepayments without paying a Prepayment charge. The Note Holder will use my Prepayments to reduce the amount of Principal that I owe under this Note. However, the Note Holder may apply my Prepayment to the accrued and unpaid interest on the Prepayment amount, before applying my Prepayment to reduce the Principal amount of the Note. If I make a partial Prepayment, there will be no changes in the due date or in the amount of my monthly payment unless the Note Holder agrees in writing to those changes
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