Several states give residents until April 15 to make 529 contributions that count toward the state income-tax deduction for 2014. By Kimberly Lankford, Contributing Editor From Kiplinger's Personal Finance, December 2014 When do you have to make 529 contributions to get the state income-tax deduction for 2014? --L.T., MilwaukeeSEE ALSO: The Best 529 College-Savings Plans As a resident of Wisconsin, you have until April 15, 2015, to contribute and still take the tax deduction for 2014. In addition to your state, Georgia, Mississippi, Oklahoma, Oregon and South Carolina give residents until April 15, but most states require you to make your contribution by December 31 to take a 2014 tax deduction. For each state’s rules, see www.savingforcollege.com. Sponsored Content Got a question? Ask Kim at email@example.com.