Freelancing for EU company

Hi, I am about to start remote freelancing for a company registered in Poland. They offer me to either invoice them or provide my services for them based on Contract for specific work. I believe if I do it based on Contract for specific work, 20% Withholding Tax is being deducted and transferred to Polish government. If that's the case do I still need to pay the tax in the UK from a nett amount I receive? Thanks in advance, John

Hi,

You need to declare the gross amount and claim the Polish tax as Foreign Tax Credit Relief. You can see guidance here:

Tax on foreign income

Thank you.