“ According to the IRS agent we still have to file a return (form 1120) with all zero's. I complied a list of about 35 forms related to form 1120 and was wondering if it is necessary to file all these forms with the 1120.”---->I think so; Unless exempt under section 501(Exemption from tax on corporations, certain trusts, etc), all domestic corporations (including corporations in bankruptcy) must file an income tax return whether or not they have taxable income. Your corp, as a domestic corporation, must file Form 1120 unless it is required to file a special return. Being in bankruptcy or having no taxable income does not exempt a corporation from filing. A corporation may file Form 1120 or may be required to file any of a number of special 1120 forms, depending on the corporate structure and business type.