How to calculate UK import duty and taxes - SimplyDuty- import duties for hand gel from brazil ,How much import duty you will pay will depend upon the value and type of goods being imported as every product has a different duty percentage rate. In order to calculate the percentage of duty payable you can ask your UK freight agent or work it out yourself using the online tariff from the UK government website .Import Duty Calculator - SimplyDutyCalculate import duty and taxes in the web-based calculator. It's fast and free to try and covers over 100 destinations worldwide.