Declaring Input VAT When Supplying to US and International Markets

[jamies_taylor]

I supply products to both the US and international markets and will be registering for VAT. HMRC has confirmed that I should only charge output VAT on my US-sourced income. When completing my VAT return, should I declare all input VAT I incur, or only a proportion based on my sales split? Currently, about 60% of my turnover is from international sources and 40% from the US, while my suppliers are roughly 10% international and 90% US. Should I claim input VAT in full or restrict my claim to 40% in line with my taxable sales?