Is Turbo Tax calculating 2017 Illinois State returns using the correct tax rate of 4.35%?

TurboTax updated the online version of the Illinois tax return January 31, 2018.  It should use the blended rate.  If, however, you wish to use specific accounting and Schedule SA, it is not currently supported. 

I have a definitive response from the Developers just today.

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The IL-1040 Schedule SA will not be  supported by TTX for for 2017 IL taxes.

Thus, if you really want to use it, you will have to manually do it on paper forms, and mail in your IL forms .

Thus only the default blended tax calculation will be used by the  TTX software.

(Or check with other software providers)