@Scott tier usage, yes. But can you do tier usage pricing for total accumulated usage over the year, but send invoice on a monthly basis? For example, tier usage pricing could say : 0 - 100 at $1.00 and 100 - 200 at $ 0.80 and 200 - 300 at $0.70
Month 1 usage is 50, so invoice is $50 (YTD usage = 50)
Month 2 usage is 175, so invoice should be 50 usage at $1.00, 100 usage at $0.80, 25 usage at $0.70 (YTD usage = 225)
This isn't possible via suitebilling, I think.