CHICAGO — Illinois ended fiscal 2013 with an unpaid bill backlog of $6.1 billion as the state made a $1.5 billion dent in its payables over the previous year, state comptroller Judy Baar Topinka announced Monday.

The good news is overshadowed by Topinka's warning that the backlog is expected to swell to about $7.5 billion by the end of August. The dent in fiscal 2013 bills was primarily due to a $1.3 billion infusion of unexpected income tax revenues from assets, bonuses, or early dividends received by businesses and individuals seeking to have their income taxed at 2012 rates in anticipation of higher federal tax rates this year.

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