What would happen if you didn't file taxes?

The IRS would conduct an audit and you'd owe penalties and interest.

The first time, the IRS would file for you and you'd owe more than you would have if you had filed yourself, plus penalties and interest.

The first time, the IRS would probably overlook it. If they caught it, you'd face jail time, plus owe all the taxes and penalties and interest.

It's impossible to avoid filing taxes.