I am an International Consultant consulting for various organisations in both the USA and the UK. Most of my payments clauses comes with the whole "Applicable taxes to be deducted at source".
Can an expert please let me know how much tax a company in either jurisdiction can deduct when I am neither based in those countries?
You'll approach this by working with a Tax person in each jurisdiction.
Note: This only applies if you have a brick + mortar location, along with exact organization of the business.
Tip: Making mistakes can be costly. Don't believe any "experts" besides in-country Tax people.