When can I apply for a one-year extension for a Non-Immigrant O visa in Thailand before returning to the UK?

@George *********

I second

@Wannikea ********

suggestion don't even waste the effort or time to come in on a Non-O visa this time.

Come in on a single entyr tourist visa, get your funds transfered in and seasoning, then leave.

When you come back do so on the 90 day non-O visa, and then you can go when you have 45 days or less on that stamp to get the year extension.

Remember the funds need to be IN the account for 2 months on the date you APPLY for your extension.

You might consider coming in on a tourist visa and getting an extension to stay till July, during that time get your financials in order. Then return after July on a Non Imm O and extend in country or visa exempt and proceed from there. I think the scenario you propose is going to be fraught with timeline stress.

In Chiang Mai you can apply when you have 45 days left on your existing stay. That's June 9th I think just going by your math.

I'm not sure what the consideration period is for a retirement extension in Chiang Mai, so maybe someone with experience can provide some more information. If it's a 30 day under consideration you may be able to just make it before you leave, and they may be able to cut you a day or two of slack if you explain the situation and ask if you can return early.

Hopefully someone can confirm the under consideration length so you can plan accordingly.