The Collaborative International Dictionary of English v.0.48:

nonremittal \nonremittal\ n.
   1. The act of failing to meet a financial obligation.

   Syn: default, nonpayment.
        [WordNet 1.5]

   2. A loss resulting from failure of a debt to be paid.

   Syn: nonpayment, default.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

nonremittal
    n 1: act of failing to meet a financial obligation [syn:
         default, nonpayment, nonremittal]
    2: loss resulting from failure of a debt to be paid [syn:
       nonpayment, default, nonremittal] [ant: payment]