After I completed the file extension I noticed a typo in my husband's SS#. What can I do now that the request has been sent??

[GeoffreyG · Accepted solution]

There actually is an easy "fix" for this.  While you cannot recall or correct an extension request that you have already sent (just like an e-file tax return . . . once you click the send button, it's out of reach for any further corrections), what you can do is to send another extension request.

In other words, if your SSN is correct on the original extension form, but your husband's is not, then simply send another extension request, using your husband's SSN (only).  There is no IRS penalty for sending more than one extension request, as anything they receive that is a true duplicate will just be ignored -- at no harm to the taxpayer.

While it may require you to create a new online account, just for making the single extension, it can be done.  Alternatively, you can file a (duplicate) extension request on paper, and drop it in the mail.  If it's late by a day or two, the IRS probably won't object.

Here is a link to IRS Form 4868.  Only Page 1 is necessary to return to the IRS.  Mailing addresses are found on Page 4.

https://www.irs.gov/pub/irs-pdf/f4868.pdf

Thank you for asking this question.