Teachers have been working without a contract since Aug. 20, despite talks that started in April.
The union voted Jan. 18 to file an intent to strike.
The Dixon School Board declared an impasse in negotiations Jan. 29.
Superintendent Michael Juenger said the board declared the impasse because members believe negotiations are at a standstill. He said offers were being returned with little to no changes.
Sandra Sodergren-Baar, president of the union and a teacher at Dixon High School, said in a video posted on YouTube that little progress has been made, despite calling on a federal mediator.
"Yes, we're asking for a raise," Sodergren-Baar said in the video. "We took a soft freeze. We agreed to take the freeze to save the district money. Our efforts did not help, because over 20 positions have been eliminated that same year."
Teachers are asking for a salary increase, adequate staffing in classrooms, updated textbooks, improved training and upgraded technology.
Juenger said that the district is dealing with a revenue loss of about $700,000 from decreasing property values and cuts to general state aid, and that he expects to continue to slash the budget for the next few years.
"We can think of no viable solution to pay for their demands. We operated $57,000 in the black this past year, pretty much a balanced budget, and it won't get any easier," Juenger said.