HMRC extracted the extra payment from Apple Europe after what the department called an "extensive audit" of the company's pre-2015 tax filings, according to the Financial Times. Apple Europe is a London-based subsidiary of Apple which, among other activities, handles European marketing operations.
The audit is believed to have found that Apple Europe was not paid fair value for the services it provided to other Apple subsidiaries, leading to artificially lower taxable revenue.
"We know the important role that tax payments play in society. Apple pays all that we owe according to tax laws and local customs in the countries where we operate," Apple said in response.