For tourist entries you formally should be able to show proof of an onward ticket within the initial 60 days you’ll get stamped in for. You could call your airline and ask for their policy regarding this or purchase a cheap onward ticket to a nearby destination.

I assume you already have a bank account as it’s impossible to open one on tourist entries. If not the best option is to apply for a Non O before you leave which also is excused for onward ticket requirement.

Yes, but do you also have a IDP as well?

You don’t have to have any funds seasoned(x) for the 90 days Non O in country unless you apply at Jomtien immigration. But it’s (almost 100%) impossible to open a bank account without a long stay visa now unless you use an agent to do the whole visa process for you and still are able to open an account as a part of the total package.

(x)Extension of stay requires two months seasoning for the application.

@Godson *********

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Invitation letter is normally not required, but if you’re gonna stay private and the e-visa portal ask you to upload documentation for accommodation, you might need an invitation and confirmation if you’ll stay private at one address in Thailand and also provide a telephone number as a contact.

Your visa is valid for 90 days after it’s issued at the embassy and e-mailed to you and gives you 60 days upon entry within these 90 days.

For a 30 days tourist extension you’ll normally need; A receipt of your TM.30 address registration, copy of id-page and last stamp in your passport, a pass photo and 1900 baht in cash. Most immigrations allow to you apply for the extension within the 30 last days of your stay, some 45 days. Jomtien and Samui within the last week.

Everyone, no matter what stay you’re on as long as you’re not Thai.

@Roberto ********

….Authorisation, it’s a pre-approval for visa exemption entries.

With a US passport you’ll still get a 60 days visa exemption and free stamp upon arrival. Nothing is turned back to 30 days. ETA is postponed without further notice but you need to du a TDAC arrival card from 72 hours prior to arrival in Thailand.