solo 401k

I wanted to check I did the deduction correct because it didn't deduct anything from what I owe.

 

I made an employer deduction ( I have an LLC) to my Solo 401k for $6,000, i selected employer match and entered in $6,000 but my overall tax payment didn't decrease at all. I was under the assumption I could deducted my contribution to help lower my taxes. 

 

any help would be awesome, trying to get this done before the 28th to receive the discount.

 

Thanks