Set variable error

I have the following in a stored procedure

(Trying to capture value in a variable so can read it from a vb.net app)


DECLARE @TableTierCreditsMonth1 as Decimal(18,2)
DECLARE @TableTierCreditsMonth2 as Decimal(18,2)
DECLARE @TableTierCreditsMonth3 as Decimal(18,2)


;WITH TempTableTierCreditsMonth1 (Playerid,TableTheoMonth1, TablewinMonth1, TableTierCreditsMonth1)
AS

(SELECT PlayerID
            ,sum(Table_TheoWin) AS TableTheoMonth1
            ,sum(Table_Win) AS TablewinMonth1
            ,case when sum(Table_TheoWin) >= sum(Table_Win) * @TableTierMultiplier then sum(Table_TheoWin) else sum(Table_Win) * @TableTierMultiplier end TableTierCreditsMonth1
            
      FROM CopyPlayerManagement..PlayerDay
      WHERE AccountingDate BETWEEN @BeginDateMonth1
                  AND @endDateMonth1
            AND Table_Games > 0
            and playerid = @PlayerID
      GROUP BY PlayerID)
      
            
      set @TableTierCreditsMonth1 = (Select TableTierCreditsMonth1 from TempTableTierCreditsMonth1)

I get an error saying Incorrect syntax near the keyword 'SET'

Not sure why