Assuming there would not normally be tax implications (in terms of income taxes), then there are no additional tax implications just because you are paying in advance. Foreign VAT is never deductible, so in this particular case there shouldn't be any tax implications. The remainder of this answer is likely not directly applicable to your problem, but may give some context for similar problems.
If this had been purchased in the U.S. in a state with a sales tax (not VAT), and you choose to deduct sales tax rather than income tax (for example, if you have no income tax in your state), then you would deduct that sales tax typically in the year you pay it. Most individuals operate on a 'cash' basis, ie, you declare income when you (constructively) receive it and declare expenses when you (constructively) pay them, regardless of when the service occurs. For example, my mortgage company failed to pay my second property tax installment on my behalf in 2012; I found out in 2013 and paid it then. As such, I had only one property tax payment to deduct in TY 2012 and three to deduct in TY 2013.
Constructive means when you deliver a check or similar instrument, even if they don't cash the check immediately (though consult a tax adviser for a better definition and clarification whether a particular payment method would count as constructive or not).
So, if there were tax implications, it would be irrelevant that the service occurred next year; it is only relevant that you paid it this year.