def formula_2009_01_01(foyer_fiscal, period, parameters):
    """
        Renvoie la liste des charges déductibles avant rbg_int pour 2009
        """
    pensions_alimentaires_deduites = foyer_fiscal(
        'pensions_alimentaires_deduites', period)
    cd_acc75a = foyer_fiscal('cd_acc75a', period)
    cd_deddiv = foyer_fiscal('cd_deddiv', period)
    cd_eparet = foyer_fiscal('cd_eparet', period)
    grosses_reparations = foyer_fiscal('grosses_reparations', period)
    niches1 = (pensions_alimentaires_deduites + cd_acc75a + cd_deddiv +
        cd_eparet + grosses_reparations)
    return niches1
