It time to collect your Year End resources. If you’ve upgraded from GP 10 or early GP 2013 versions there are some nice new YE features in GP. Microsoft Dynamics GP Year-End Update 2016: General Ledger
Microsoft Dynamics GP Year-End Update 2016: General Ledger – Microsoft Dynamics GP Community
Year-End & 1099General Ledger & FinancialsMicrosoft & the GP EcosystemGP 2013GP 10
Archived post from 2016. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.