We rebalance if there is a change of asset allocation +- 3%
And yes, you can rebalance too often. The administrators in the life company will just get annoyed with the constant requests to sell a few quid in one fund and buy into another.
The purpose of rebalancing is to prevent investment drift. If you are 1% or 2% off the original asset allocation and there is a market crash, it is not going to make much of a difference to your valuations. If it is over 10% off the original allocation, you will notice it more.
Steven
http://www.bluewaterfp.ie (www.bluewaterfp.ie)