Thanks for the reply, I’m not sure how useful deductions would be for me as my landlord will not allow me to claim my rent (home is place of work) as a deductible.
20% on my entire earnings would work out much higher than if I were to pay UK tax (which has a personal allowance that is a non-taxable amount, with tax being taken off the top of that), if I paid my UK tax and had proof of this, would this be accepted by the Taiwan tax people in consideration of the double taxation agreement?