Guilderland residents will pay $18.62 per $1,000 of assessed value in school taxes this year, which is a 2.3-percent increase over the previous year. When voters went to the polls to pass the $120 million school budget last May, the district had predicted a 2.66-percent increase. Property owners in the other three towns partially covered by the Guilderland school district will have a higher-than-predicted rate.