What is meant by "tax forms" on the Marketplace submission guidelines?

The submission guidelines say:

Please be prepared to provide the following required materials: […] Additional information regarding Taxpayer ID, tax forms, and bank information will be required to receive payment for content sold on the Marketplace.

What is meant by “tax forms”? I live in Germany and I have a Taxpayer ID but that’s all I have.

Thank you in advance!

We won’t require any tax forms for you since you’re in Germany.

Income tax in the UK is the tax where deductions are made at source, which means at the point where income is credited but not transferred to the concerned person and is thus, also known as tax deducted at source. Visit: Know about the Income Tax in the UK

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