When Richard III was proclaimed king on 22 June 1483, Sir William Haute was immediately removed from office as Sheriff of Kent and replaced with Sir Henry Ferrers. In Buckingham's rebellion, in the insurrection which occurred in Kent in the middle weeks of October 1483, Sir William was held by the December 1483 proclamation to be a ringleader, and was outlawed among the principals, with Sir John Guildford and Sir Thomas Lewknor, as being "the king's rebels and traitors, which imagined and utterly conspired the destruction of the king", yet is seemingly absent from the general act of attainder of January 1484, where instead the name of "Richard Haute, late of Ightham, squyer" appears prominently. This is certainly Richard the brother of Sir William, and his lands were seized and granted instead to his brother James Haute, who had not rebelled. Sir William, however, was able to perform a second lease of his lands in Shelvingford in 1484.