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Possible online services disruption due to Internet related outage

A worldwide technology outage is causing disruption to some State of Illinois online systems.  We are aware of this issue and are diligently working on restoration.

MyDec Helpful Resources

MyDec at MyTax Illinois - used by individuals, title companies, and settlement agencies to submit, approve, or reject Real Property Transfer Tax Declarations.

MyDec allows you to electronically submit:

  • State of Illinois Forms PTAX-203, 203-A, and 203-B
  • City of Chicago Form 7551 – Real Property Transfer Tax Declaration
  • Real Property Transfer Tax Declarations for participating counties.

To get started, visit the MyDec at MyTax Illinois webpage or select the applicable procedure manual below.

Procedure Manuals

IDOR-PT1, MyDec Preparer Access Procedures - This procedure manual provides detailed steps and screenshots for the Preparers work in MyDec, including those for accessing MyDec, navigating MyDec, and entering PTAX-203s. 

Assessor Procedure Manuals

IDOR-PT2, MyDec County Assessor Access Procedures - This procedure manual provides detailed steps and screenshots for the County Assessors work in MyDec, including those for accessing MyDec, navigating MyDec, and entering PTAX-203s.  

County Recorder Manuals