Illinois revenue officials say residents won’t be able to file their 2013 income taxes until the end of January, which is a two-week delay.  The Springfield State Journal-Register reports the delay follows a similar federal postponement.  Refunds and the April 15^th filing deadline aren’t affected.  The Internal Revenue Service is delaying the start of the tax-filing season because of last year’s government shutdown that furloughed workers who were programming and testing tax-processing systems.  Now, state and federal returns can be filed starting January 31^st.  Sue Hofer is a spokeswoman for the Illinois Department of Revenue.  She says the two-week delay isn’t expected to cause problems in Illinois because “very few people file in January anyway.”  Employers have until Jan. 31 to give employees W-2 forms.