A friend told me that when filing taxes online a person can enter any 9 numbers as a social security number and say that number is connected to their dependent. He said at the time of filing the IRS can't tell if that social security number is valid; it isn't until the IRS is going through everyone's paperwork that the "mistake" may be found. So, my question is if someone did decide to do that what is the consequence if the IRS finds out? Is it jail time or just a huge fine? Im curious because it sounds false; I mean if that's the case wouldn't everyone be doing it?