Pay online at MyTax Illinois – You can pay electronically from your checking or savings account. Add your expected income tax due and other taxes from Form IL-1040 and enter the result here.ILSDU is the payments processing center for all Illinois child support payments. Follow the ATM instructions for inserting or scanning your Illinois Link card. Easily access and pay Illinois Tollway invoices online. Learn how to resolve outstanding tolls with our simple payment system.