I made an 8 months official trip in 2009 and I am due for interview soon. I got tax return transcripts for 2004-2008 and attached copies on N-400 submitted in Dec 2009. My understanding is that tax return transcripts are for ascertaining whether one filed as a non-resident alien. I have not filed taxes for current season-2009 (year of the long trip). Is there a chance that IO will ask about 2009 tax returns or do they stick to the five year period prior to N-400 submission? By the time I filed, 2009 taxes were not yet due.