Yes, 11 years is correct. In Iowa, most things relating to a "contract" have an 11 year retention period.
We treat them like signature cards and store them either onsite or offsite and pull them when closed to start the retention process.
We are in the process of implementing imaging which means that we won't have to keep the hard copies and can simply go into the system to set the retention date.
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--A bad day at sea is better than a good day at work.