If your contribution to the pension plan was deductible from your wages, it would be reflected in box 1 on your W-2. The entry in box 14 would simply tell you that there was a contribution to the plan, but any amount listed there would have no affect on your taxable income, as it would have to be reflected in the box 1 entry.
What you would see if the contributions were deductible would be the amount in box 1 on your W-2 form would be your gross wages less the deductible amount of your contributions to the pension plan. You would likely notice that your social security wages in box 3 would be higher than box 1, since the contribution would not be deductible from your social security income.
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