This Illinois alimony calculator makes Illinois maintenance calculations using the Illinois alimony formula. For more information on estimating your spousal maintenance or alimony amount, feel free to use our Illinois alimony payment estimator.Check out our five steps process now! Estimate Alimony Payments. Spousal maintenance is not automatically granted in Illinois divorce cases, and it will typically only be awarded if a spouse can demonstrate a financial need. Whether you sacrificed your own career or education in support of your spouse or to raise children and perform other domestic duties in the marriage. In Wisconsin, either spouse can request spousal maintenance no matter how or why the marriage came to an end. This practice offers legal help to clients in the North Riverside, Illinois area. If your parents are separated or divorced, each parent should fill out the calculator with their own information. If you wish to make a payment, please set your browser preferences to allow cookies.