The Tax Office holds unclaimed property tax overpayments made within the last three years and outstanding (uncashed) refund checks. Tell them that they have "overpaid" you.Then ask them to ring you for details. The salary overpayment resulted because . The IRS uses Letter 3286C to inform you that they believe you may have overpaid for a particular year and will refund you the difference. If you paid the taxes on. Mohella rep told us we're not eligible for the 52 overpayments because we didn't request a refund prior to the loan forgiveness being approved or finalized.