Catchup provision for 401k qualified plan

[rlivy2003]

I pay a 401K CATCH UP CONTRIBUTION per week to my 401k. Do I claim this on my taxes? where?

[KenH1]

No. Those contributions are captured from box 12 of your W2.   The taxable income reported in box 1 should be reduced by that amount, which has the same effect as a deduction (this does not apply to Roth accounts).