Contributing land to group, Dont get ripped off.

Sort of. There's the tier-free 512 that Premium members can have and, if deeded to a group, the group can have an extra 10% of land meters for the tier, so it's not exactly the same. It's an easier concept to think of it as paying for tier, and not for land. For instance, if you pay for 2048 tier, you can have 2048 + 512 meters of land, the 512 being tier free. And, if that land deeded to a group, you have even more. But think of it as paying for tier. You land stats and the group's land stats will tell you have much more land you can have for the same tier payment.

But past that amount - the amount you need to reduce tier is the exact same number as the size of the land you sold?

So if you sold 2048, reduce tier that same number, to avoid being charged for non existent land?

& thanks

If you sell 2048m of land that is deeded to a group, remove 2048m tier from the group. Then have a look at the group's land stats and see if it has any land available (spare tier). If it has, remove that amount as well. Repeat until the land available = 0

Don't worry about removing too much tier from the group. The land available can be negative for a while without any ill effects. If it goes negative, put enough tier back to make it 0.

ETA:
You could remove 2048 + 10% (2252) straight away and see how it looks in the group's land stats. It's not something that needs to be got right immediately, or else. You have plenty of time to fiddle with it.

I wrote a guide about this a few weeks ago whilst trying to figure out how to help out a friend who didn't want some land they purchased:

http://your2ndplace.com/node/1664

Might be confusing!