E-filing has some key benefits over other methods of filing.
Since the IRS doesn't have to re-enter your information into its system, e-filing results in fewer data-entry errors.
You receive an acknowledgment that the IRS received your return. Paper returns don't receive an acknowledgment of receipt.
You'll receive your refund faster if you e-file your return rather than mailing it.
If you owe the IRS, you can authorize the IRS to electronically withdraw the money you owe directly from your bank account. You can tell the IRS not to withdraw the money until the last minute on the filing deadline, even if you filed your return earlier.