years to collect what you owe them.
Statute starts once you file, so a person who hasn’t filed returns is often screwed, but if you’ve filed just not paid, you can often negotiate down the amount you owe, since those debts will disappear at some point and the IRS will be motivated to collect something.
The IRS doesn’t want your house and doesn’t really want to garnish bank accounts or wages, but it’ll start doing that to get a person’s attention once a few years have gone by and the limitation on collection is looming.