Many people think an annulment is a fast way out of a marriage. In reality, Illinois sets a high bar for proving that a marriage was never valid, so true annulments are rare. Because of that, most people who want to end a marriage must file for divorce instead.
If you are considering an annulment or divorce in 2026, a Joliet, IL divorce lawyer can review your situation and help you choose the right path.
When Is a Marriage Legally Invalid in Illinois?
Under the Illinois Marriage and Dissolution of Marriage Act, 750 ILCS 5/301, Illinois defines an annulment as a declaration of invalidity of marriage. The law allows it only in a few narrow situations. A marriage may qualify if:
- One spouse could not legally consent because of mental incapacity, alcohol, drugs, or another disabling condition.