If I got the tuning and script files correctly:
- Bills are supposed to be delivered Monday, 5am, every week.
- Bills are a percentage of the billable household value, defined as the value of the furnished lot, plus everything in the household inventory and everything in the inventory of every household sim; it explicitly excludes the household funds. The percentage is 2% for the first §20K of value, then 3% for what exceeds that up to §30K, then 3.5% to §50K, and 5% of anything above that.
(As an example, a §100K value household will pay 2% of the first §20K, then 3% of the next §10K, 3.5% of the next §20K, and 5% of the remaining §50K, for a grand total of §3900.)
- The Frugal trait reduces the bills by 25%.
- If the bill goes unpaid the sim gets the electricity turned off, and then the water turned off, apparently with 48 hours between cutting the electricity and the water.