While I'm not 100% positive, I'm rather inclined to believe your 15 free days will come first. My reasoning is it's simply a good business practice and the whole point of inviting someone back to the game is to re-earn their business. Charging someone prematurely goes against that.
Welcome back!
It's not how many times you get knocked down that count. It's how many times you get up.
Thanks for the quick response! And yeah, it does make sense but when I was searching I got all confused. 
It's the other way around unfortunately.
You both get your free 15 days game time AFTER the returning friend has applied the code then purchased 30 days game time.
Also, last time i did this, the 30 days paid for game time had to be spent before the 15 days were added. I don't know if that was a bug or an intended "feature" but i was happy with the free time regardless. (was subbing an expired second account)
CoH PvP SG = SuperUnion - Co-Leader - Union/Freedom
CoV PvP VG = Disruption - Co-Leader - Union/Freedom
Global = @Rent & @Rent.
Playgroup are all **** - Global Handle
Thanks for clarifying that, I guess I'll wait until March 4th.
Cheers.
Not a problem 
CoH PvP SG = SuperUnion - Co-Leader - Union/Freedom
CoV PvP VG = Disruption - Co-Leader - Union/Freedom
Global = @Rent & @Rent.
Playgroup are all **** - Global Handle
I've got an inactive account (90+ Days) and a Code but I'm not dead set on paying yet.
My question is will I get billed and get the 15 Free Days after the 30 are up, or will I get 15 Free Days before I get billed thus giving me a chance to return and try it out before it's set in stone?
Sorry if this has been asked a million times, I tried the search & NCS info on it but got mixed results. I'd appreciate a straight forward answer. <3
Edit: I realize March 4th is just around the corner and will provide the perfect chance to come back and try it out, but my friend won't stop bugging me to do this today, but she doesn't know the answer to my question. I'd love to play again but I just don't want to pay only to get bored in a few days.