I've read through your description of Michigan's prompt payment laws (which are great, by the way). But I'm not sure how much interest we're allowed to charge on a late payment. The law says we can include "reasonable interest" in our next pay app, but I'm not sure what they think that means. To me, 10% sounds pretty reasonable, considering how long it's taken me to chase down these invoices. How much do other people charge for late payments? Are you aware of any court cases where the Michigan courts decided how much interest a GC can charge?