Kickers and LED

[mercs]

Sorry if this has been asked b4. I've been out of magic for a bit.
When exactly do you pay kicker costs?
Can I use LED to pay for a kicker?
thx!

[Nihil Credo]

Same time as you pay the regular mana cost. So no using LED for that.

[cdr]

Kicker is an additional cost, which is part of the total mana cost of casting a spell.