SELECT  * FROM (SELECT
            SUM(Cost) AS Cost,
            CONVERT(VARCHAR(3), DATENAME(MONTH, DATEADD(MONTH, MONTH(MonthCol), - 1))) MonthCol
            FROM myTable WHERE YEAR(MonthCol) = 2016
            GROUP BY  MonthCol) AS TP
     PIVOT (SUM(Cost) FOR MonthCol IN ([Jan], [Feb], [Mar], [Apr], [May], [Jun], [Jul], [Aug], [Sep], [Oct], [Nov], [Dec])) AS PVTTable