D93 Refinances Bonds, Reducing Annual Costs and Lowering Property Taxes The D93 Board of Trustees approved a move this week that will save local taxpayers money. Thanks to the district’s strong Aa3 credit rating, D93 was able to lower its annual bond repayment costs—saving about $500,000 per year and reducing property taxes by roughly $5 per $100,000 in taxable value. Even bigger savings are coming in December as new state programs help cover a portion of school district bond payments, meaning l