In a Commander game, if my commander would be exiled, I can put it in the command zone instead. And Release to the Wind has the effect
Exile target nonland permanent. For as long as that card remains exiled, its owner may cast it without paying its mana cost.
So, if that spell hits my commander, and I choose to put it into the command zone instead of exile, then if I later cast it without paying its mana cost, do I still have to pay the commander tax?