After you file

It is called a RANDOM review because it is random ... you were just picked at random for a review.  Don't read anything more into it ... if you filed a true & accurate return then you have nothing to be afraid of and all you can do is wait patiently. 

The IRS no longer processes returns in first in first out batches. They are processed individually so returns sent in at the same time will not necessarily process together. There are 3 IRS steps/bars. (1) Accepted for processing, (2) Refund approved & (3) refund sent. The IRS states that 9 of 10 returns will process in 21 days or less. However considering that the IRS processes more than 140 million returns so that means 14 million will be delayed for more than 21 days. 

Think of the IRS process as a long pipe line. Some returns will be rejected before being allowed into the pipe and some will be accepted. Then once accepted into the pipeline many will process directly through without any delays and some will not.  Some returns will be siphoned off for further review of some kind. The basis of what triggers these reviews is a well guarded secret but some are just picked randomly every year.

Some reviews are automated and some will require human attention. The processing times will vary but, due to the under staffing situation that the IRS announced earlier this year, they are likely to be much longer this year. Employing the  IRS “Where’s My Refund” tool will be the best method to track your refund - http://www.irs.gov/Refunds