Not everyone has to file a tax return with the IRS. As a general rule, you should file a tax return if you’re a U.S. citizen or resident alien and any of the following situations apply to you:
- You want to receive a refundable tax credit or tax refund.
- You earn an amount of income that exceeds the income threshold for your filing status (this can range from $5 to $32,300, depending on the tax year, your age, whether you’re a dependent, and your filing status).
Filing a tax return is optional in the first situation, but not in the second. The problem is that the IRS will sometimes assume you’re required to file a tax return even if you aren’t.
For example, let’s say for the 2024 tax year, you earned $50,000 in taxable income. You filed a tax return for that year and paid any applicable taxes owed. Then in 2025, you had $0 income and no other facts or circumstances required you to file a federal income tax return, so you didn’t file one.
The problem arises because the IRS may not know you weren’t required to file a tax return for 2025. Therefore, if the IRS doesn’t receive your tax return by the April 15 deadline (or they don’t receive a request for a filing extension), the IRS might assume you have an unfiled tax return for the 2025 tax year and aren’t reporting taxable income.
This can result in a surprise letter or notice from the IRS, such as a CP59 or a tax bill, because the IRS filed a tax return on your behalf (more on this later, and why it's a bad thing).
As for situations where you know you were supposed to file a return, but haven’t, past-due tax returns can cause stress and anxiety because you’re always wondering if and when the IRS is going to realize you didn’t file a return and what the consequences might be.
To make this uncertainty worse, it can take a long time before the IRS notifies you of the filing deficiency. By the time the IRS contacts you about one or more unfiled returns, enough time has passed to turn any modest penalty or outstanding tax balance into something much larger and harder to pay.
Unfiled tax returns can be problematic, but the sooner you deal with them, the easier these problems can be to fix.

