SELECT Sum(TblPromet.Prihod) AS Suma_prihoda, Sum(TblPromet.Trosak) AS Suma_rashoda, TblPromet.Porez
FROM TblPromet
WHERE (((Month([Datum]) & Year([Datum]))=[Forms]![frmIzborMjeseca]![IDmjeseca] & [Forms]![frmIzborMjeseca]![Godina]))
GROUP BY TblPromet.Porez;