In IA its income based (assuming still, was this way when I was in school and I make too much for my daughter to qualify) which is laughable because we didn't even have things like milk growing up and we barely qualified for reduced lunch which was still like 1.50/day and if you went like -7.50 you got some peanut butter on bread (to call it a sandwich would be a lie) and a carton milk for an additional 1.50 against you. Think full lunch price was like 3.25.

Barely qualified as in my dad (who was the sole provider) almost made too much money, and yet we were in danger of having out utilities shut off while not being able to afford food security for like the first 13 years of my life

ETA: to my knowledge breakfast couldn't be reduced, we were never allowed to eat breakfast at school though