If you're an expat or a non-resident working abroad, understanding the click here. is key to making the most of your UK tax relief options. The HS304 is a supplementary form used when claiming tax relief under the UK’s double taxation agreements. These agreements are in place to prevent you from paying tax twice—both in the UK and in the country where you earn your income. Comp... https://www.taxd.co.uk/blog/how-expats-can-complete-hs-304-for-uk-tax-relief