ok... So every time I make icing for my cake before I actually ice the cake it is sweet and delicious BUT! When serving the cake the next day (all nice and decorated) the icing tastes different!! The icing becomes less sweet.... Does anyone know why this is??? I usually keep the cake covered so I figured it can't be from just sitting out... HELP!!!

So the icing by itself tastes different than the icing in conjunction with the cake? That's normal. Sounds like your cake is very sweet and so the icing itself seems less sweet in comparison.

Try keeping some icing out separate to taste the next day and compare it with the taste of the icing combined with the cake - then you will know if it's the icing or if it's the cake being sweeter than the icing.

Hmmm, never had this problem. Mine tastes the same until it's gone.