Actually, from what you have described, there are no non-marital assets as they have all been commingled with marital assets. The non-marital assets, to continue to be non-marital, should have been kept in a separate account. It is now too late.
From the facts described you have effectively commingled the funds which removes the non-marital status. I would recommend you consult with local counsel to discuss further.
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Your actions probably constitute commingling, which makes the account marital property. There may be a way around commingling if the marital money stayed in the account for a very short period of time and then was transferred out of the account. But that may be an uphill climb. Consult with a lawyer, this area of law is tricky.
Under Illinois Law when marital and non-marital property are commingled by contributing one estate of property into another resulting in a loss of identity of the contributed property, the classification of the contributed property is transmuted to the estate receiving the contribution. The estate that contributes the property to the other may under certain circumstances may be entitled to reimbursement if the the contribution is clearly retraceable and is not deemed a gift. In your case the fact that you deposied $1,000 into your $20,000 non-marital savings does not make the savings account marital. The account remains your non-marital property subject to a $1,000 reibursement to the marital estate. The $1,000 that you spent on paying marital bills from your non-marital checking account would be considered a gift to the marriage and is lost. In summary, you now have $19,000 of non-marital savings and $9,000 of non-marital checking.
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