Thats a good point JWR. In section 8 (Master File Codes), part 5 (Filing Requirement Codes) which starts on page 8-72 of the 6209 manual we have the following chart:
________________________________________________________________________________
5 Filing Requirement Codes (FR Codes)
FR Codes are posted to the Entity Section of the Master File… Read more

Found this in a post in the Tax Freedom Now Group on Yahoo Groups:

There will be a two digit number, either 30 or 55 immediately beside the words TAX PERIOD:
30 is the Master File Tax Code [“MFT”] for the IMF/1040 taxes;
55 is the MFT Code for the miscellaneous civil penalties.

Hope that helps

Just an FYI….I have 30 on all of mine.

I just looked again and I have 2 sets of IMFs for the years I requested. The first set has TAX PERIOD 30 and the second set has TAX PERIOD 55! I completely forgot to input those in the decoder program.

SuaZman

I guess I will do a FOIA on a MFR 16 and see what comes back.

I found an interesting piece that described that the IRS was using 16 from the BMF filing requirements section of the 6209 manual on the IMF file. MFR 16 seems to mean form 1120- US Corporation Income Tax Return and specifically form 1120DF which is US Income Tax Return for… Read more

Yup! Great Proggy but it shows undefined also. 🙁

SuaZman