When e-filing your tax return you do not need to attach any 3rd party documents to your e-filed return. For example, W-2's, 1099's, 1098's, etc.) The IRS already has a record of those, as well as a record of any quarterly tax payments you made. However, you should always file your receipts and other proof of payments with your printed copy of the filed and accepted tax return. If the IRS needs you to provide proof of anything, they will request that proof by a formal letter you will receive in the mail from the IRS.
