Thanks all for the replies. I believe you are right, that statement about the tax exemption is just referring to AMT.
My background is rather similar to thread starter except that I am from Singapore. I have just received the gold card. Intend to work remotely from Taiwan but still checking my tax obligations.
DTA between Singapore and Taiwan reads similar to the UK’s. It can be found at https://www.iras.gov.sg/IRASHome/uploadedFiles/IRASHome/Quick_Links/singaporetaiwandta.pdf.
Articles of interest are:
ARTICLE 4 - FISCAL DOMICILE
1. For the purposes of this Agreement, the term “resident of a territory” means any person who is a resident in accordance with the tax laws in that territory.
2. Where by reason of the provisions of paragraph 1 an individual is a resident of both territories, then his case shall be determined in accordance with the following rules:
(a) he shall be deemed to be a resident of the territory in which he has a
permanent home available to him. If he has a permanent home available to
him in both territories, he shall be deemed to be a resident of the territory with
which his personal and economic relations are closer (centre of vital
interests);
(b) if the territory in which he has his centre of vital interests cannot be
determined, or if he has not a permanent home available to him in either
territory, he shall be deemed to be a resident of the territory in which he has
an habitual abode;
(c) if he has an habitual abode in both territories or in neither of them, the
competent authorities of the territories shall settle the question by mutual
agreement.
3. Where by reason of the provisions of paragraph 1 a person other than an individual is a resident of both territories, then it shall be deemed to be a resident of the territory in which the control and management of its business is exercised.
ARTICLE 12 - PERSONAL SERVICES
1. Subject to the provisions of Articles 13, 14, 15 and 16, salaries, wages and other similar remuneration or income for personal (including professional) services derived by a resident of a territory shall be taxable only in that territory, unless the services are performed in the other territory. If the services are so performed, such remuneration or income as is derived therefrom may be taxed in that other territory.
2. Notwithstanding the provisions of paragraph 1, remuneration or income derived by a resident of a territory for personal (including professional) services performed in the other territory shall be exempt from tax of that other territory if
(a) the recipient is present in the other territory for a period or periods not
exceeding in the aggregate 183 days in the calendar year concerned; and
(b) the remuneration or income is paid by or on behalf of, a person who is a
resident of the first-mentioned territory; and
(c) the remuneration or income is not borne by a permanent establishment which that person has in the other territory.
3. A resident of a territory shall be exempt from tax in the other territory on remuneration for services performed on ships or aircraft in international traffic.
From article 4, I should be deemed to be a resident of Singapore.
From article 12 point 1, since I am performing services as a resident of Singapore for my company based in Singapore but services are performed in the other territory (Taiwan), I may be taxed in the other territory (Taiwan). But from point 2, I should be exempted from tax in the other territory (Taiwan) if I spend less than 183 calendar days a year in Taiwan and paid by my company based in Singapore.
If my understanding is correct, then it means that I should spend less than 183 calendar days a year in Taiwan if I want to avoid double taxation. But doing so means that I would not be fulfilling the minimum 183 calendar days a year needed for permanent residency. If I hope to get permanent residency in Taiwan, I should still spend at least 183 calendar days a year in Taiwan and pay tax in both countries.