inglés al español Negocios/Finanzas Negocios / Comercio (general) loan payments

... you may wish to make a Default Payment as well as make an Excess to Principal payment.

Does anyone know what "Excess to Principal payment" means? I couldn't find it anywhere. I just found two separate definitions:
- Excess Payment" means the amount by which such payment exceeds the amount which would have been received by such Certificate Holder, such Pass Through Trustee or the Indenture Trustee if the Owner Trustee (in its individual capacity) or the Owner Participant had not become subject to the recourse liability referred to in clause (ii) above.
- “Principal payment” means the amount of a loan due during one year which is attributable to the principal portion of the debt, less interest costs.

I'm not sure whether it can be translated as "pago de saldo sobrante al capital", or sth similar.

Can anyone help? Txs.