Even though Iām in CM Iām afraid I donāt know the current policy. But the owner of my apartment files a TM30 every time I come back from anywhere. Itās free, takes her about 2 minutes, and doesnāt hurt even if not required.
Your 90 day report is for the PAST 90 days not the FUTURE 90 days. Itās just a report that you have been here and does absolutely nothing to extend your stay.
I have a fixed account. I donāt touch it, but I can put money in or take it out - it just changes the interest period. BUT for immigration I have the bank āupdateā my bank book. Even without any activity, a balance forward entry is added. Ask your bank if they do that.