Americans keep falling behind on their bills — just in time for the holiday shopping season

Americans’ past-due bills are stacking up, and their newly-delinquent debts saw a marked increase in September.

The rise in freshly past-due debt is one notable part of a continuing overall climb in the share of debts that people have failed to pay on time, according to VantageScore researchers, who said delinquencies of all lengths notched a new 12-month high last month.

The…