A late payment.
Merriam-Webster Online Dictionary
delinquency (noun)1.
a) a act - delinquent
b) conduct that is out of accord with accepted behavior or the law , especially - juvenile delinquency
2.
a debt on which payment is overdue
Merriam-Webster Online Thesaurus
delinquency (noun)1.
the nonperformance of an assigned or expected action
SYNONYMS:
default, delinquency, dereliction, misprision, neglect, negligence, nonfeasance, oversightRELATED WORDS:
carelessness, heedlessness, inadvertence, inadvertency, laxityNEAR ANTONYMS:
compliance, discharge, fulfillment ( fulfilment)2.
the quality or state of being late
SYNONYMS:
belatedness, delinquency, tardinessRELATED WORDS:
dilatoriness, sluggishnessNEAR ANTONYMS:
promptitude, promptness, punctuality