You would not be able
to file your return and claim any tax benefits related to your child without
the Social Security number, so either an amended return or filing an extension
would be your options.
You can file your return without including your child or any
of the associated tax benefits. Then later
you can amend your return to add your dependent. Amended returns must be mailed and can take
some time to be processed.
Your other choice would be to file an extension. This may be a better option as long as you
expect to have the information that you need before the extension deadline
(October 15, 2018). This would still
allow you to file your return electronically.
If you expect to have a balance due on your return, you will need to pay
with your extension request before April 17, 2018.
Click the following link for more details about Filing
an Income Tax Extension.
