Most residential and commercial annual notices of assessment typically sent in early April now will be sent May 1. An Annual Notice of Assessment is not a tax bill. The notice informs you of the value assessed on your residential or commercial real estate as of January 1, 2020. Personal Property Annual Notices of Assessment for tangible business inventory, watercraft, and aircraft will be mailed May 18. You may appeal your 2020 value within 45 days of the date on your notice at Gwinnett-Assessor.com.