Can I return to Thailand with a 12-month visa after traveling to the US for 2-3 months?

But if it is not a muli entry visa you have to buy a re entry permit. Can buy that at the airport in a part of the "room"where you queue is a small office where you can get that re entry permit.

depend on the visa. Have a look. If it says"multi entry"then you just leave thailand and return without problems. Of course now a days you have to apply for COE etc etc.

You may have to apply for a re entry visa before you leave the kingdom.

Before you leave Thailand go to Immigration Office and it cost 1,000 BHT to get a reentry permit. You can also get this permit at the airport but will take longer. You can also have a multi entry permit which cost 4,000 BHT for unlimited in and out. If you do not have either one your retirement visit is finished and you have to start the process all over again

If a non o go immigration and get a single visa entry and then not a problem

1. CHECK YOUR PASSPORT! A "Visa" is a full page sticker that says either Non-B or Non-O. An extension of stay is a stamp that says "extension of stay".

2. If you have a one year visa, it is multiple entry. HOWEVER, on each entry, you can only stay for 90 days.

3. If you have an extension of stay, UNLESS you purchase a re-entry permit, you can not leave. A re-entry permit is a stamp in your passport that says "re-entry permit". You can get a re-entry permit at any immigration office, and it's 1K THB for a single entry.

You sure it's a visa and not extension of stay?

12 month 'VISAS' are all multiple entry, so as long as you return before the visa expires you'll be fine. If you have a 12 month 'extention of stay' then you'll need a re-entry permit.

If it's multiple entry no problem.

You’ll need an exit/reentry permit, return before 90 days, then pending the covid situation on return: no expert but been traveling in snd out for quite a few years.