Do I have to pay tax when selling bitcoin in Thailand?

I bought 1 btc several years ago but not using a Thai exchange. I have a Thai tax number and lived here for ages 12 yrs. I want to sell it on bitkub and convert to thb.

Do I have to pay taxes on this?

I asked on A.I ..... 2 models said the same thing.... that I might not have to pay CGT

Since you’re a Thai tax resident and you’re selling this week through a Thai SEC-licensed exchange (Bitkub) for a straight sale, your capital gain from the sale of the Bitcoin may be exempt from Thai personal income tax under the 2025–2029 exemption (1 Jan 2025–31 Dec 2029), provided all exemption conditions are satisfied. hlbthai.com2

Because you bought on overseas exchanges several years ago, that generally affects your cost basis (what you paid) and documentation, but it doesn’t automatically disqualify the exemption if the actual disposal is done via the licensed Thai operator. hlbthai.com2

What you should do now:

• Gather proof of original acquisition cost and dates (wallet/exchange statements, transaction history/export).

• Keep Bitkub sale records (trade confirmations, fees, sale proceeds) and be consistent with the cost-basis method you use for your calculation. hlbthai.com1

Anyone have knowledge on this?