Microsoft
MicrosoftJohn_Neithercott please refer to the FAQ section here Extended Security Updates for SQL Server and Windows Server | Microsoft
In Azure: Customers running Windows Server 2012 or 2012 R2 or SQL Server 22012 in an Azure Virtual Machine will get Extended Security Updates for no additional charges above the cost of running the virtual machine. Customers moving to Azure SQL Managed Instance (PaaS) do not need Extended Security Updates, as this is a fully managed solution, and is always updated and patched by Microsoft.
On-premises: Customers with active Software Assurance or subscription licenses can purchase Extended Security Updates for approximately 100% of the on-premises license cost annually. Pricing is available on published price lists. Contact your Microsoft partner or account team for more details.
Hosted environments: Customers who license Windows Server 2012/2012 R2 or SQL Server 2012 through an authorized SPLA hoster will need to separately purchase Extended Security Updates under an Enterprise or Server and Cloud Enrollment either directly from Microsoft for approximately 100% of the full on-premises license cost annually or from their Microsoft reseller for use in the hosted environment. The price of Extended Security Updates acquired through Microsoft resellers is set by the reseller. Pricing for Windows Server Extended Security Updates is based on Windows Server Standard per core pricing, based on the number of virtual cores in the hosted virtual machine, and subject to a minimum of 16 licenses per instance. Pricing for SQL Server Extended Security Updates is based on SQL Server per core pricing, based on the number of virtual cores in the hosted virtual machine, and subject to a minimum of 4 licenses per instance. Software Assurance is not required. Contact your Microsoft reseller or account team for more details.