I am not actually posting saying "this is what you have to do" I too am seeking clarification on how to proceed with things when our friends come over, they are not staying with me as we are having a new kitchen fitted but I do as a friend want them to have a good holiday and also dont want the property owners ending up with a huge fine, they are more then willing to make everything legal but can not have time off work at the drop of a hat to go over and do the registering etc, i was going to try and help them out if it were possible as we going over next month for quite a long stay...
If this registering of family with different surnames to tapu holders or if you rent out then also for paying guests, helps the authorities to track/ keep track of possible terror suspects then I am all for it...
I thought I had read if you make money from a rental then thats a seperate issue where you would go to the tax office, there is a threshold which someone has mentioned i think about how much you can earn on rental income before any tax has to be paid...