What should I do if I can't report TM30 within 24 hours of returning to Chiang Mai after a trip abroad?

I lost the will to live reading the comments (and I deleted some that were just wrong). :O

You report to the immigration office where you got your extension and where you hold a "permanent address" within 24 hours of you getting back TO THAT ADDRESS from overseas.

So traveling around the country doesn't count only when you come back "home" BUT I'd have some pictures with the dates on them to show people that even though you entered thailand on xxx date you didn't actually get to your home until yyy date. OR be prepared to pay the failure to report fine :/

I didn't understand the post but again you need to report in CM immigration within 24 hours after coming back in Thailand. They rarely accept any excuse. TM30 is big deal for them. So if you don't want 1,600 baht fine better do it.

What visa will you enter on?

Because I read here yesterday that Chang Mai do not need TM30 for tourist visas or visa exempt.

If you have a registered address in Chang Mai and go on a road trip inside Thailand, you don't have to report when coming home. If you go abroad, you go back to the Immigration Office within 24 hours after arrival home to update your address registration.

From what I have heard through friends having dome similar you must report once back at your usual address in CM.

I thought if you leave the country before the 90-day report when you reenter it starts again. Ask an agent.

I not understand the question. But if this is about the registration of address the designated time is 24 hours AFTER arrival at the address. So I do not see any problem.