F I cash out of my 401k early, worth 12k and after taxed I bring home 6-7k, will I still owe when I file taxes; even though I am already being taxed upon withdrawal?

I am cashing out of my 401k early; worth 12,500. With the early penalty fee and the taxes I will only bring home around 6,000 - $7,000. When filing my taxes will I still have to owe even though I was already taxed and almost half was already taken? if so around how much would I have to pay when I file taxes?