DesperateLOR

I have decided that it would be best for me to delay attending grad school. Now I have several questions: How do I tell the school that I can't go this year without hurting my chance of getting accepted in the future when I reapply to the same program? Do grad schools keep a history of which faculties you applied to and which ones you were accepted to/rejected from/rejected offer? If a student rejects an offer and applies to that same program in the future, will the chance of getting accepted be significantly lower? How about if the student applied to the same school but not the same program?