X0101
  
    24F-2NT
    
      LIVE
      
        
          
          0001524289
          XXXXXXXX
        
        333-179913
      
      
        false
        false
      
      S-6
    
  
  
    
      
        
          Van Kampen Unit Trusts Taxable Income Series 394
          
            225 Liberty Street
            New York
            NY
            X1
            10281
          
        
        
          
            true
          
        
        
          811-2754
          
            
              333-179913
            
          
        
        
          04/30/2022
        
        
          0.00
          319734.00
          6593702.00
          6913436.00
          0.00
          (6913436.00)
          0.000092700
          0.00
        
        
          0.00
          0.00
        
        
          0.00
        
        
          0.00
        
        
          CRAIG S. FALDUTO
          Executive Director, Investment Research
          05/25/2022