I'll have to do some accurate numbers now we have some more info, but my back of an envelope figure came out at almost 30% of funds transferred having to be paid in taxes for our situation. I see a spreadsheet coming!
Many will stick their heads in the sand and think it doesn't apply to them, and do nothing - a bit like people did with Brexit. But its good to plan for the worst and hope for the best. Comes as a bit of a shock to suddenly make everything 30% more expensive. Food etc, ok, not so bad, but rent is now 30% more, bringing in money to buy a car? Now 30% more...etc Add in the complication of the tax year ends not lining up and its going to get messy.
Basically yes, all of the money from pensions income brought into Thailand is taxable if you are in the UK. Then you can deduct the amount of tax you paid in the UK. However because the UK has the generous tax free allowance, we don't pay much tax so there is little to offset. It will impact UK pensioners a lot. Not only the tax, but the costs of getting tax advice and for someone to submit the return and interpret the reply. Going to suddenly get very expensive here.
If you apply for the OA visa outside of Thailand there is the ongoing requirement to take out Thai medical insurance (which would be on top of the international insurance we already have). So there's an extra expense. Can the OA visa then be renewed as a non-O visa and the medical insurance cancelled once we have the 12mths of transfers to our thai bank account? Or are we locked into the OA visa? darn, it so complicated.