School districts face growing cost pressure related to the health benefits they provide for their retired employees. The first section of this post explains how districts structure their retiree health benefits, and the second section analyzes historical spending levels and future liabilities. We find that the unfunded liability—the total future cost of providing the retiree health benefits that employees have already earned, after subtracting the funds already set aside to cover those benefits—is about $24 billion across all districts. Some districts have taken steps to reduce their future costs, such as requiring employees to work longer before qualifying for these benefits. A few districts also are beginning to set aside additional funds now to cover future retiree health benefits, a practice that could yield significant long-term savings.