In the Form 1040 Contributions to an IRA or Roth deduction, it asks whether you contribute to a traditional IRA. If one has already had his 401(k) account from his employer and the contribution amounts can be found in his W-2 box 12, should he answer yes and enter the contribution amounts from his W-2 into the Form 1040? It seems the contribution amounts in the W-2 box 12 have already been deducted from one’s gross income and he cannot take the deductions again. Is it correct? Can you explain it?

A 401k is not an IRA. Your 401k contributions have already been deducted from your taxable income.

A 401k is not an IRA. Your 401k contributions have already been deducted from your taxable income.

Thanks for your reply. How about the Roth contributions to 401(k) plan in the Box 12 AA of Form W-2? Are the Roth contributions to 401(k) in the Form W-2 Box 12 AA qualified for the Contributions to an IRA or Roth deduction in the Form 1040?