Of held in your country on or before 31st Dec 2023 no tax to pay. If you bought here 1st Jan 2024 or after yes your interest is a possible tax liability. And yes there are deductions, if you over 70, married to a thai, kids, but please go talk without giving your name and see the two female bosses at the 2 tax offices one in chalong and the other phuket town. They are ok, I've been twice just to get more info..