Sub cpy()
Dim wb1 As Workbook, wb2 As Workbook
Set wb1 = ActiveWorkbook
Set wb2 = Workbooks.Open("Under & Over Payments.xls")
wb1.Sheets("Sheet1").UsedRange.Copy Destination:=wb2.Sheets("Sheet1").Range("A" & Rows.Count).End(xlUp).Offset(1)
wb1.Close False
wb2.Save
End Sub