The consequences coming from non-filed returns can be absolutely severe for noncompliance. Even if people don’t owe any tax, it still be extremely important to file. Let’s look at what happens unless people file tax returns. 1. Non-filling Letter As someone has a late tax return, the IRS will send out letter having an assortment of code numbers like CP515 , CP516 , CP518 and CP515B . Uncle Sam will eventually step up their aggressiveness in the matter and send a notice rela