S&P Global Ratings assigned its 'AAA' long-term rating and 'AA' underlying rating for credit program to Leander Independent School District (ISD), Texas' series 2018A unlimited-tax refunding bonds. At the same time, S&P Global Ratings affirmed its 'AA' rating on the district's outstanding general obligation (GO) debt. The outlook on all ratings is stable. The long-term rating reflects our view of the district's eligibility for, and participation in, the Texas Permanent School Fund (PSF) bond guarantee program, which provides the security of a permanent fund of assets that the district can use to meet debt service on bonds guaranteed by the program. (For more information on the program rating, see our report on the Texas PSF, published Jan. 25, 2017, on