Exactly what changed on the W-2? Box 12 amounts for a 401(k) should have no effect on the tax at all unless the employer also reduced the amount of box 1 taxable income.
(Before amending be sure to save a copy of the original .tax2016 file so you can go back to the original - always work on a copy.)
**Disclaimer: This post is for discussion purposes only and is NOT tax advice. The author takes no responsibility for the accuracy of any information in this post.**
