If you want a chariot mount to have the same benefits from a Mark of Chaos that its rider has, you have to pay the points to give the chariot the Mark of Chaos.
Source: Warhammer: The Old World Online Rules Index
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If a character with the Mark of Nurgle (for example) is mounted on a chariot with the Mark of Chaos Undivided, does the chariot benefit from the character's Mark, or do I have to pay the points to give the chariot the Mark of Nurgle for it to gain the same benefits?URL Copied!
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Source: Official Ravening Hordes FAQ & Errata - Version 1.1