You must have a Transmitter Control Code (TCC) to use the Fill-in Extension of Time request. To obtain a TCC go
to IR Application for TCC on FIRE.
If you cannot obtain a TCC you can submit a paper Form 8809, See Publication 5911, Information Returns Application for TCC Tutorial.
Use of this system constitutes consent to monitoring, interception, recording,
reading, copying or capturing by authorized personnel of all activities. There
is no right to privacy in this system. Unauthorized use of this system is
prohibited and subject to criminal and civil penalties, including all penalties
applicable to willful unauthorized access (UNAX) or inspection of taxpayer
records (under 18 U.S.C. 1030 and 26 U.S.C. 7213A and 26 U.S.C. 7431).
Test submissions are not accepted at this site. If you are trying to submit test
submissions, go to
fire.test.IRS.gov