Most likely, the pension benefits listed in box 1 are taxable. The only reason they would not be taxable is if the income used to make the contributions to the pension plan was taxed already and you didn't deduct the contibutions from your taxable income. Also, it is possible that only some of contributions were not deducted, as mention by @JamesG1. So, you probably need to amend your return to report the taxable income.
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