30 GC per country question

First, I want to say that I've had a lot of problems finding where things are within the documents themselves. I've tried looking for the answer to this, but have been unable to find it.*

Anyway

So everyone gets an empire for free. This means a home country on one of the worlds. You can annex slave countries on that world, but if you want another home country on another world, you need to pay 30 gold coins per month.

That I understand

What I'm not sure about is how this applies to corporations. I do know the last time I tried to figure things out that I saw something about a one-time payment.

Currently I have an empire over on LU
Lets say that I decide to also have a corporation, and so, pay 30GC for the right.

Will I need to pay an additional 30GC for my corporation on LU next month, or, are corporations only charged once?

* Edited to add, things are never in the section, or even sub-section I expect them to be.

You will have to pay 30GC each month for the enterprise. Anything beyond your first (empire or enterprise) is 30GC per month. (You can choose to play an enterprise for no GC each month if you forego having an empire.)

Dang. I have the 30 for this month, but I won't have real monies to buy more till about the middle of june

Don't buy GC with money. Win level awards.

This. 30 GC is easy to get if you hit WL 2-3 with your country. You can also buy boosters for your enterprise to extend it 1 day per booster, if you have like 10-20 GC but not 30.