I'm currently maxing my 401(k) contributions ($18k) and funding my and my wife's Roth accounts ($5500 each). She's currently only contributing $200USD/mo to her 403(b).
Due to us owing an extra $2500 last year, we both changed our W4's to zero exemptions. I also changed my 401(k) contributions from 50% Roth/50% traditional to 100% traditional - in the hopes to help avoid another tax liability this year.
By her changing the W4 exemption from 1 to 0, her net check was approximately $100/month less than before.
So, this question is a springboard off of this question. If she changes her W4 back to one exemption, and increases her 403(b) contribution by $100, will/should the net paycheck be the same? A back-of-the-envelope-round-number answer should suffice. I'm guessing there are other numbers that come into play for a specific answer. She's a teacher in Texas, and does not contribute to Social Security, and I work in the private sector.
Please let me know if there's any other information I need to supply to help arrive at a reasonable answer.