Calculate fiscal year in SQL Server

Question

How would you calculate the fiscal year from a date field in a view in SQL Server?

Answer 1

DECLARE @DateFieldName DATETIME = '1/1/2020'

--UK Fiscal Year

SELECT 
CASE 
  WHEN MONTH(@DateFieldName) in (1,2,3)
   THEN CONCAT(YEAR(@DateFieldName) -1 , '-' , YEAR(@DateFieldName) )
   ELSE CONCAT(YEAR(@DateFieldName) , '-' , YEAR(@DateFieldName)+1 )  
  END AS [FISCAL YEAR]

--RESULT = '2019-2020'