State tax filing

TurboTax does not support the St. Louis Personal Earnings Tax. If you need to file the E-1 Form, do it outside TurboTax. Your Missouri W-2 should have your St. Louis income and tax listed on lines 18-20.

As @DanielVO1 said, you can claim a credit for St. Louis income tax on your Illinois return.

In the Illinois state section,

• Go to Take a look at Illinois Credits and Taxes
• Edit Credit for taxes paid to another state
• Add Another State on Other states(s) income and tax summary
• On Illinois base income taxes by Other State
  • Select Missouri as Other State Tax Paid To
  • Yes to City, County or Locality taxes?
  • $0 to Income Taxed by Other State
  • Enter your St. Louis tax paid in Tax Paid to Other State