A: If you’re a business owner or gig worker, it may be because of a simple rule the IRS follows:

Information = (Assumed) Income… until you prove otherwise!

When the IRS or your state receives income info—like a 1099-K, 1099-NEC, or other payment form—they assume that’s your net income unless you file a return to explain it. That means:
• Maybe you had $15,000 in deductible business expenses
• Maybe you didn’t even make a profit
• But if you don’t file a return, they may assume the entire amount is taxable.

That’s how you could get hit with a $5,000+ tax bill (plus penalties and interest), even if you don’t actually owe anything.

In reality, once deductible expenses and the standard deduction (or itemized deductions) are factored in, you may owe nothing at all. But you have to file to show that.

And if this does ever happen to you—don’t panic. You can still fix it by filing your tax return, even if it’s after the deadline. Once filed, the IRS or state will typically adjust your tax bill down to zero.

Key Takeaway: If the IRS or Massachusetts DOR receives income information under your name, you need to respond by filing a return—or risk being taxed on the full amount.