The same thing happened to me, except I have NOT yet filed my tax return, but I did just start classes last month, and was using my Post 9/11 GI Bill. What I have gathered from looking at a few other forums is that it could be a VA Benefit i.e. disability, education, etc..or it could be a Tax Refund. The only common denominator is that IT IS from the government! At this point, I'm going to call my bank, and I suggest you do the same. I am out of town, but other forums have noted that a few weeks following the deposit they received a statement in the mail explaining exactly what it was! If you find out any info please update. Hope this helps a little.