Illinois Form ST-556 is not an income tax form and is not included in your state tax return. TurboTax does not support this form.
According to the Instructions for Form ST-556:
Form ST-556 can be filed electronically using MyTax Illinois at mytax.illinois.gov. The Illinois Department of Revenue also issues preprinted paper forms in limited quantities. You can request preprinted returns by calling our Central Registration Division at 217 785-3707. You can also request preprinted returns using MyTax Illinois. Note that preprinted forms display information for each of your business locations. Related sales and use tax forms are available on our website at tax.illinois.gov
