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Form 1120X (Rev. October 1997)
Generally, Form 1120X must be filed within 3 years after the date the original return was due or 3 years after the date the corporation filed it, whichever is
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Form 1120X (Rev. November 2016)
Generally, Form 1120X must be filed within 3 years after the date the corporation filed its original return or within 2 years after the date the corporation
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2016 Publication 535
Jan 19, 2017 Form 1040X. Corporation. Form 1120X. S corporation. Form 1120S and check box H(4). Partnership. Form 1065X if filing on paper or. Form 1065 and
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