I don't know the specific method, a PA files the t

I don't know the specific method, a PA files the tax refunding for me. For example, if I lose $10k in penny stocks, and make $100k in my income from work, this $10k loss will be taken off from the tax I am supposed for the $100k income. I don't know whether I will need to pay tax for $(100k-10), or need to pay the tax for $100 income - $10k. Any way this $10k loss will be taken care of at tax refunding in some way.