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This article is about the year 1040. For the US tax document, see Form 1040.
- March War of Independence of Western Xia occurred.
- June 17 - Harthacanute lands at Sandwich and reclaims the English Throne.
- August 15 - King Duncan I is killed in battle against his first cousin and rival Macbeth. The latter succeeds him as Scottish Monarch.
- The oldest brewery still active is founded at Weihenstephan.
- Seljuk Turks defeat the Ghaznavids at the Battle of Dandanaqan.
- For the U.S. Internal Revenue Service (IRS) form, see Form 1040.