Why does my federal tax due amount increase when I enter my traditional IRA contributions?

[VolvoGirl]

It might think you made an excess contribution and is giving you a penalty.  Do you have enough Earned income?  Make sure the income and contribution are assigned to the same person.

If you have self-employment income you can only contribute up to your net profit reduced by the deduction allowed for the ER portion of your self-employment taxes. See IRS publication 590A ) https://www.irs.gov/pub/irs-pdf/p590a.pdf