Sorry if I already started a thread on this subject, but after running a small test I'm even more sure that something changed re adding income to a household's cash while it is not played. Playing rotationally this is a big problem because after a full round (in my case 50-100 simdays) some houses' cash balance might have increased tens of thousand Simoleons in mysterious ways, while others had no change at all. It ruins the fun when you get lots of money you should not have. I suspect the problem to be related to retired sims getting their pension paid even when other houses are played.

So, I picked a group A of 4 houses where there lives minimum 1 retired senior, and a group B of 4 houses with no retired senior. I noted their cash balance, and checked back after playing 7 simdays in other houses.

In group A all houses had changed cash balance, but 1 had less than before.
-52
+1022
+1280 (NB I accidentally entered this house to build, so the sum is approximate and for fewer days than 7.
+882

In group B the changes was §0 for 3, an just §10 for the 4th house.
0
0
0
-10

Although this is a very small test, I think it would be worth looking into the possibility of retired pensions being paid while other houses are plaid.

I took notes on each house's cash since several simming years, and if there were any changes at all it was mostly less than §50 - normally no change at all. This did change sometime recently, perhaps 6 months ago.