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You can request that from the payer of the pension (which may be the faster way as they do keep copies) or you can get the information from the IRS.
A Wage and Income Transcript - shows data from information returns reported to the IRS, such as W-2s, 1099s and 1098s. You have to submit a form 4506 T if you request this information from the IRS.
The pension payer maybe able to send you an electronic copy.
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