What happens if the IRS files a return for me (substitute for return)?

When you don't file a required tax return, the IRS may file a Substitute for Return (SFR) on your behalf using information they have from third parties (W-2s, 1099s, etc.). SFRs are almost always unfavorable to taxpayers because: they use the most disadvantageous filing status (usually Single), they don't include deductions you're entitled to (standard deduction may be limited, itemized deductions are ignored), they don't include credits (Earned Income Tax Credit, child tax credits, education credits, etc.), and they may overstate income if there are reporting errors. As a result, the SFR typically shows a much larger balance than what you'd actually owe if you filed your own return. The good news: you have the right to file your own return at any time, replacing the SFR. Your return will likely show a lower balance or even a refund (if within the 3-year refund window). After filing your correct return, any excess assessed on the SFR is removed. Filing your own returns to replace SFRs is one of the most effective ways to reduce IRS tax debt. Many taxpayers have reduced their balance by 50-80% simply by filing proper returns with all applicable deductions and credits.