> "Hey, the federal portal says we owe $60,000 in penalties for not filing a tax return."
That doesn't sound like they're asking you to pay tax on your $0 income business. It sounds like you need to pay a fine for not filing a tax return.
What's a "normal" fine anyway? The point of having a fine being a large sum of money is to create incentive so you to do the thing they want you doing, which you didn't do.