Tax filers can begin filing state tax returns to the Illinois Department of Revenue on Feb. 12. That’s the same day they can also file with the IRS. A filer filing an error-free return electronically could have a refund, if they’re owed one, directly deposited within four to six weeks. The state says of more than 6.4 million returns filed last year, 63 percent received refunds. More information can be found at MyTax.Illinois.gov.