Already mail 1040-NR without 8889. Can I send it separately?

[anshuv99]

I had prepared my taxes using Sprintax. By the time I found out that they don't support HSA forms, I had already mailed the returns.

I had employer contributions and qualified distributions from the HSA. Can I file 8889 and mail it separately.

According to this link, I don't have to amend my return. IRS would request the missing form once they process my return.

My questions
1) Are my conclusions correct?
2) Should I wait for IRS notice or mail the 8889 form separately before the deadline(May 17)?

NB - I have 1099-SA with me.

[SusanY1 · Accepted solution]

Yes, your conclusions are correct. 

It is best to wait for the IRS to request the form.  The request will come with a specific center/area to send the form back to, which will result in quicker processing for you.