The Illinois Five Day Notice is a document used by a landlord in the state of Illinois to notify a tenant who has failed to pay their rent that they have five days to pay or quit. This notice informs the tenant that they must either pay the full amount of rent due or vacate the premises within the five-day period. If the tenant does not comply with the notice, the landlord may proceed with legal action. There are two types of Illinois Five Day Notice: a notice to pay rent or quit and a notice to quit without payment. The notice to pay rent or quit is used when the tenant has failed to pay their rent, while the notice to quit without payment is used when the tenant has violated the terms of the lease agreement.