Danish pension and DTA: I am retired and come from Denmark, which has a DTA with Thailand. Tax has been paid on all of my income in Denmark. I send my monthly pension from Denmark to Thailand every month. With the new rules, do I have to pay anyone for tax on the pension I transfer to Thailand?

You must check the Danish DTA for that specific type of pension. If there are no special rules to say that it is not taxable, then it is potentially taxable in Thailand. If the tax you paid in Denmark is considerably higher than the tax rate in Thailand, you may not need to pay anymore, as the DTA is there to protect you against paying more than the tax rate of your own country. Even if there is no extra tax to pay, it is likely you will still have to file a tax return.

You can read the Thailand-Denmark DTA here