Tax revenue is the income that is gained by governments through taxation. Just as there are different types of tax, the form in which tax revenue is collected also differs; furthermore, the agency that collects the tax may not be part of central government, but may be an alternative third-party licenced to collect tax which they themselves will use. For example: In the UK, the DVLA collects vehicle excise duty, which is then passed onto the treasury.
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France hasn't given up on creating a tax on digital revenue to prevent the likes of Google, Facebook, Amazon, Apple, and ...