After you file

 @m
I added this above.
If at some point you want to be sure it was applied correctly to your IRS account, you can download a transcript at the IRS website.  But it may take a while to show up there.
<a rel="nofollow" target="_blank" href="http://www.irs.gov/Individuals/Get-Transcript">http://www.irs.gov/Individuals/Get-Transcript</a>