Do the IDOR and the IRS exchange income tax information?
The IDOR and the IRS exchange income tax information for the purpose of verifying the accuracy of information reported on federal and Illinois tax returns. All amounts you report on Form IL-990-T are subject to verification and audit. When should I pay? Payment of tax You must pay your Illinois income and replacement tax in full on or before the original due date of the return. This payment date applies even though an automatic extension for filing your return has been granted. Estimated tax payments If you reasonably expect your Illinois income and replacement tax liability to be more than $400 for the tax year, you are required to make quarterly payments of estimated tax.
