The only thing I have to say about missed lessons/make-ups, is that many parents get very upset if you don't give them something. I have settled on 4 make-ups/year (two per semester), but they must give me notification 48 hrs in advance (this eliminates the obligation to make-up forgotten, sick, etc lessons that inevitably come up). As far as tuition goes, I have my students pay monthly, with the check due on the first lesson of the month, for every week it is late, I charge a five dollar late fee, excluding holidays, but not applicable to missed lessons (in otherwords, if they go on vacation, I get a post-dated check before they leave). The minimal late fee keeps gets all but one or two checks to me the first week of everymonth (95% of the time).