DC Unclaimed Property
If your primary business location is Washington, DC, you are required to report stale accounts payable checks that are more than 3 years old. You also must report uncashed paychecks that are more than 1 year old.
Note that if you can reach the payee of the check, you can void the stale check and reissue it. Checks should be reported to Unclaimed Property if the payee cannot be located.
Here is a link to the DC page for Unclaimed Property. The rules for unclaimed property say that once a paycheck is 1 year old, you can turn of the amount to the DC Unclaimed Property department.
Here is a
link to the full set of instructions for how to report.