IRA Contribution Information Use Form 5498 Copy B to print and mail payment information to the participant 1099-INT Forms are 2up on an 8 1/2 x 11" sheet and are printed on 20# laser paper. Order the quantity equal to the number of participants for which you file. Mail in compatible window envelopes. RDWENV05 - Moisture Seal RDWENVS05 - Self Seal