How will the proposed foreign income tax in Thailand affect expats planning to stay longer than 180 days?

The tax is here since forever :D, it just depends on yout country and the agreement between TH and your country

I can’t believe how many comments about this. Look on Google. Your home country. There are recripocal agreements.

If you country has a tax agreement.

Info : 10% des thais se déclarent et paient leurs impôts.

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Vous en concluez ce que vous voulez

I am used to paying taxes, so it is just a matter of having a tax strategy for Thailand , living half time in another country is not appealing to me

As per existing law, if you don't declare your assessable income by next year, March, you will be a tax cheat. A double taxation treaty is not a loophole for not paying taxes.

I would stay in Thailand exactly 180 days per year, which isn't much different to now.

There are a lot of ifs here. The tax on income remitted to Thailand by tax residents has not been fully implemented yet. How that works out will not be known till after March 2025. If tax on all foreign income is passed and this needs a change of law to do this. Not seen this on the government's legislative agenda and it was one civil servant suggested it. Not a lawmaker. So in the unlikely event it became law for 2025 tax year it would be 2026 before anyone has an inkling of the implementation. If you are worried about it stop bedwetting and stay home