From what you describe, you have a non-qualified pension plan, one in which your contributions are not deductible. Otherwise, your income reported in box 1 on your W-2 form would be reduced by the amount of your pension plan contributions. If this is the case, you cannot deduct the pension plan contributions elsewhere on your tax return. When you take retirement plan distributions from the plan in retirement, the distributions you take will not be taxable to the extent they are from contributions you made to the plan.
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