My offer letter from UIUC says: We also are offering a teaching assistantship during the academic year. The assistantship includes a waiver of tuition and the majority of charged fees. The stipend for the current (2019-2020) academic year is $20,589.48 ($2,287.72 per month for nine months). Summer support is available on a limited basis with priority going to first year PhD students. In addition to this support, we also offer travel support for our PhD students for research-related purposes, e.g., to present at conferences.