From Robert's Rules.
If two or more hands tie, an odd chip will be awarded as follows:
(a) In a button game, the first hand clockwise from the button gets the odd chip.
(b) In a stud game, the odd chip will be given to the highest card by suit in all high games, and to the lowest card by suit in all low games. (When making this determination, all cards are used, not just the five cards that constitute the player's hand.)
(c) In high-low split games, the high hand receives the odd chip in a split between the high and the low hands. The odd chip between tied high hands is awarded as in a high game of that poker form, and the odd chip between tied low hands is awarded as in a low game of that poker form. If two players have identical hands, the pot will be split as evenly as possible.
(d) All side pots and the main pot will be split as separate pots, not mixed together.