Do I need to update my TM30 after leaving and returning to Thailand on a tourist visa?

You aren't on any long term Visa with reentry permit etc, so you definitely have to have your landlord refile.

Immigration office dependent, go and ask your local office

Since about 2021, From a legal point of view, if you are returning to your permantly registered property (as per tm30) within the registered stay period, [checkout date future or null], there is no need to re-register, this applies to both internal and external travel of Thailand. This should be fine for 90 day reporting purposes eg on-line. However, if visiting imigration many offices will insist on a new TM30 (especially when the check-in date is prior to your visa extention or arrival in country date. Problems can arise with internal travel, where your last hotel/etc don't fill in the checkout date of their tm30, and this becomes your address on record. I travel a fair bit within Thailand to hotels and never redo my tm30 and dont have a 90 day reporting problem, but i always register a new tm30 for my extension of stay done at CW.

I’m at Surat Thani immigration, I travelled out of Thailand and I asked before leaving if I needed to do a new TM30 on my return and they said no. I went to immigration last week to get a residency certificate and a different immigration officer said that I must do a new TM30 as I’d been to Hua Hin recently. So it really depends who you talk to!

The 'rules' say that you must file a tm30 within 24-hrs of entering Thailand.. it doesn't matter what type of visa or entry stamp you have in your passport.. that is irrelevant.. if you fail to do it you can be fined.. although technically it is the responsibility of the landlord and they are at fault it is you that gets fined.. if staying in a hotel or guest house they will usually keep your passport overnight to attend to this.. but if staying in a private residence or with friends or relatives it often gets overlooked.. if you enter and leave the country with no interaction with immigration (or the police) then it's possible the absence of a tm30 will never get picked up.. but if you want to extend your stay its essential to have done it.. for people living here on long term visa's / extensions.. travelling around the country and staying at temporary addresses.. then failing to file a tm30 for your temporary addresses is perhaps more of a help rather than a hindrance.. since your home province residence has not been over written on the tm30 system and there is no need to refile.. but if you've stayed at a hotel and they filed a tm30 then you must refile upon returning home.. since your future immigration filings (such as 90-day reports) will fail if you don't align the systems data.. and the fact it takes less than 2 minutes to do online means that its not onerous.. so imo its best to just do it.. so as to avoid any problems down the line 👍

There is no consistent answer. I'd say that if you are due to renew your visa etc then make the tm30 from the last trip near your renew date. Otherwise don't bother

I'm on a Non-O (retirement) and Chiang Mai told me if it's travel within Thailand there's no need for a new TM30, but if travel is out of the country then they need a new one. But..it's a bit of a catch 22, if I travel within Thailand I can't do an online 90 day due to the address mismatch, so I just do a new TM30 every time as it only takes 30 seconds.

If you have permission from Immigration to make short trips abroad while living on a tourist visa and coming back each and every time to the same address, it is no problem.

If you did not discuss this with your local office, I can not tell you.

Officially you have to report within 24 hours after arrival at the address.

That means when you left Thailand and return or when you decide to stay overnight at another address.

I depends on your local immigration. I’ve been on the same one for 7 years, been out of country many times, but my local office is Nonthaburi.