I'm doing the contracted version of turbotax. I added the price for the laptop I bought and it only took off a small amount. I thought the whole value would be deducted?

I am contacted and the laptop is fully used for work only.  I spent about $400 on it.  I added it in the section of expenses as turbotax recommended.  The price of what I owe, only went down a little, not the full amount of the $400.  I thought it should all come off since it is for work and I was required to use it for my contracted work since the company won't provide me a laptop to do their work.


PS. I had replaced my laptop from last year since the other has a broken screen and I just got rid of it.  Do I have to do something with this for this years taxes?  That was a cheap $300 laptop.