File tax extension without spouse's ITIN

[sikaozhe]

I am trying to use easy extension to file an extension now, but my wife doesn't  have ITIN. because the IRS office is not open yet and we could not apply for the ITIN before deadline. 

Can we file my extension as  Married Filing Joint if I do not include my wife's Tax ID ? 

How Should I  fill in the field "3 Spouse’s social security number" in form 4868?

[Opus 17]

The spouse's ID should say "NRA" (for non-resident alien).  If the program won't let you do that, you will need to print the form, write it in, and mail it in.