You can pay online and you will be entering your SSN when you do so. As for mailing a check--you do know it is when the envelope is postmarked that matters, right? Even if the IRS does not get around to opening your envelope for awhile, if you send it and it is postmarked by the deadline, you are fine. Whenever I mail ANYTHING to the IRS or state I send it certified mail so I get back a receipt showing when they received it.
If you have federal tax due you can pay by mailing your payment with the 1040V voucher, having the payment taken out of a designated bank account, or you can pay directly on the IRS website.
https://www.irs.gov/payments/direct-pay
https://ttlc.intuit.com/community/tax-payments/help/how-can-i-pay-my-federal-taxes/00/26212
https://ttlc.intuit.com/community/tax-payments/help/how-do-i-pay-my-irs-tax-due-with-a-check-or-mone...
But---why could you not e-file? Was your return rejected?
Some rejected returns can be fixed and re-filed. Some have “un-fixable” reasons for the rejection and have to be mailed instead.
You received a rejection email that we cannot see. Please tell us word for word what it says so we know how to help you. Or even copy and paste the email message.
Or---did you get some sort of error message when you tried to e-file?
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
