The European Commission had ordered Dublin to collect the money in 2016 after concluding that two Irish tax rulings allowed Apple to pay less tax than other businesses.
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As a result of both parties contesting the ruling, the matter is now awaiting a European Court of Justice decision, and the money will be paid into the escrow account in the interim.
Apple filed an appeal against the Commission's ruling in December 2016, and the company accused outspoken EU Competition Commissioner Margrethe Vestager of using Apple as a "convenient target" to make headlines.
The $15,4 billion will start flowing into Irish coffers in Q1 2018, but Apple continues to deny any wrongdoing.
With Apple's appeal still in process, the tax payments will be made into an escrow account.
Starting next year, will have to start paying Ireland back billions of back taxes.
The Irish Finance Ministry said: "These sums will be placed into an escrow fund with the proceeds being released only when there has been a final determination in the European Courts over the validity of the Commission's Decision". Per the Journal, the European Commission says it will not close court proceedings against Ireland until all of the money is transferred.
Apple believes that the ruling will be overturned in time and that it's acted in accordance with the law.