Yes – under certain circumstances, the IRS can and will file a tax return on your behalf. This is called a Substitute for Return (SFR), and while it solves the IRS’s problem of collecting tax from non-filers, it rarely serves the taxpayer’s best interests.

Understanding how SFRs work, why they almost always overstate your liability, and how to replace one with your own return gives you the information you need to respond appropriately.

What Is a Substitute for Return?

A Substitute for Return is a tax return prepared by the IRS using income information it already has on file from third-party reporters. Every employer that pays wages files W-2 forms with the IRS. Every bank that pays interest files 1099-INT forms. Every brokerage that handles investment transactions files 1099 forms. When you do not file your own return, the IRS can use this third-party data to construct an estimate of what you owe.

The authority for the SFR program comes from Internal Revenue Code Section 6020(b), which allows the IRS to prepare and sign a return when a required return has not been filed. The SFR is legally treated as a return for the purpose of starting the assessment and collection process.

How the IRS Calculates Taxes on an SFR

The IRS does not have access to all the information that would appear on a properly prepared return. As a result, SFRs are built on what the IRS can see – income – and apply conservative defaults for everything it cannot see.

Income Used

The IRS uses all income reported by third parties for the tax year in question. This includes:

• W-2 wages from employers
• 1099-NEC non-employee compensation (freelance and contract income)
• 1099-MISC miscellaneous income
• 1099-INT bank interest
• 1099-DIV dividends
• 1099-G unemployment compensation
• 1099-K payment card and third-party network transactions
• SSA-1099 Social Security benefits
• 1099-R retirement and pension distributions

This income data is generally accurate – the same forms that you would use to prepare your own return. The problem is not the income side; it is the deduction and credit side.

Deductions and Filing Status Applied

An SFR applies the standard deduction for the tax year. It uses the least favorable filing status available – typically single, even if you are married and would qualify for married filing jointly (which carries a higher standard deduction). It applies no additional deductions, no credits, and no adjustments beyond the bare minimum required by law.

This approach means an SFR does not account for:

• Married filing jointly or head of household status
• Itemized deductions (mortgage interest, charitable contributions, state taxes paid, large medical expenses)
• Above-the-line deductions (student loan interest, IRA contributions, health insurance for self-employed)
• Child tax credit, dependent care credit, education credits
• Earned Income Tax Credit
• Self-employment expense deductions
• Business deductions for freelancers and contractors

The Result: An Inflated Tax Bill

For most taxpayers, a properly filed return would show a lower tax liability than an SFR. In some cases – particularly for taxpayers who itemize deductions, have significant self-employment expenses, or qualify for substantial credits – the difference is dramatic. The IRS knows that SFRs overstate liability in many cases; the SFR is not designed to be an accurate return. It is designed to create a legal basis for assessment and collection.

The Process Before an SFR Is Finalized

The IRS does not immediately finalize an SFR. There is a notice process that gives you the opportunity to respond by filing your own return.

CP59, CP516, and CP518 Notices

The IRS typically begins by sending a CP59 notice requesting your missing return. If no response is received, it follows with CP516 and then CP518, which indicates that the IRS intends to proceed with an SFR. These notices are sent to the last address on file with the IRS.

Statutory Notice of Deficiency (90-Day Letter)

Before finalizing the SFR assessment, the IRS sends a statutory notice of deficiency – sometimes called a 90-day letter. This notice formally proposes the tax assessment based on the SFR and gives you 90 days to respond. Your options within that 90-day window are:

• File your own tax return for the year – this supersedes the SFR and recalculates your actual liability
• Petition the United States Tax Court to dispute the proposed assessment

If you do neither within 90 days, the IRS finalizes the assessment. Once finalized, the SFR amount becomes a legal tax debt and the collection process begins.

Missing Deductions and Credits: What You Lose

The gap between an SFR and a properly filed return is often largest for taxpayers who fall into specific categories.

Self-Employed Individuals

If you earned 1099 income as a freelancer, contractor, or small business owner, your gross income is reported to the IRS. But your business expenses – supplies, equipment, home office, mileage, professional services – are not reported by anyone. An SFR treats your gross 1099 income as taxable, with no offset for expenses. A properly filed Schedule C would deduct legitimate business expenses, often dramatically reducing your net self-employment income and tax.

Homeowners

Mortgage interest is one of the largest deductions many taxpayers claim. If you own a home and pay mortgage interest, an SFR does not reflect this. If your itemized deductions exceed the standard deduction, an SFR understates your deductions and overstates your taxable income.

Families With Dependents

The Child Tax Credit and Dependent Care Credit can significantly reduce tax liability for families with children. The Earned Income Tax Credit is a refundable credit that can eliminate tax liability entirely for lower-income working families. None of these appear on an SFR. If you have qualifying children or dependents, your actual tax liability may be substantially lower than the SFR shows – or you may actually be owed a refund.

Capital Gains Transactions

If you sold investments or other assets, the 1099-B form filed by your brokerage reports gross proceeds. But your cost basis in those assets – what you paid for them – is not always available to the IRS. An SFR may treat the full gross proceeds as taxable gain, even if your actual gain (proceeds minus basis) is far smaller.

How to Replace an SFR With a Real Return

Replacing an SFR is the most effective way to reduce an inflated IRS assessment. Here is how the process works.

Step 1: Request Your IRS Transcripts

Start by downloading your account transcript and wage and income transcript for the affected year through IRS.gov. The account transcript shows whether an SFR has been processed (look for TC 150 with an SFR indicator) and what amount was assessed. The wage and income transcript shows the income data the IRS used.

Step 2: Gather Your Documentation

Collect all income records, deduction documentation, and records of tax credits you are entitled to claim for that year. For self-employed income, gather business expense records. For homeowners, get your mortgage interest statement (Form 1098). For parents, have Social Security numbers and documentation for any dependents.

Step 3: Prepare Your Actual Return

Prepare your return using the correct prior-year Form 1040 and applicable schedules. The form for each year is available at IRS.gov/forms-pubs. Your return should include all deductions and credits you legitimately qualify for. A properly prepared return using actual information is what the IRS should have received in the first place.

Step 4: File by Mail

Prior-year returns cannot typically be e-filed. Mail your return to the appropriate IRS address for prior-year filings. Use certified mail with return receipt so you have proof of delivery. Your filed return supersedes the SFR and triggers a reassessment of your actual liability.

Step 5: Follow Up on Processing

Processing mailed prior-year returns typically takes 4 to 8 weeks. After processing, you will receive an updated notice reflecting your actual tax liability. If the properly filed return shows a lower liability than the SFR, the difference (minus legitimate penalties and interest on the correct amount) should reduce what you owe.

What If the SFR Has Already Been Assessed?

Even if the 90-day window has passed and the SFR has been finalized, you can still file your own return to supersede it. The IRS will process your return and issue an adjusted assessment. The longer you wait after an SFR is finalized, the more interest accumulates on the inflated SFR amount – making it worthwhile to file your own return as quickly as possible.

If enforcement action (wage levy, bank levy, or lien) has already begun based on the SFR assessment, filing your return and reducing the assessed liability can help resolve or reduce those actions. A tax professional can assist in coordinating the return filing with requests to release or reduce enforcement holds.

Steps to Correct the Situation

To summarize the steps for replacing an IRS-prepared SFR with your own return:

• Request IRS transcripts to confirm the SFR has been processed and identify the assessed amount
• Gather income records and documentation for deductions and credits you qualify for
• Prepare the correct prior-year Form 1040 with all applicable schedules
• File by certified mail with proof of delivery
• Contact the IRS after processing to confirm the adjusted balance
• Arrange payment or a payment plan for any remaining balance

When Professional Help Is Worthwhile

If the IRS has already finalized an SFR assessment and enforcement action is underway, or if your return involves complex income sources, a professional can help navigate the process more efficiently. An enrolled agent or CPA with back-tax experience can pull transcripts, prepare the prior-year return, and communicate with the IRS on your behalf to resolve the situation.

Summary

Yes, the IRS can file a tax return on your behalf – but it will not be in your favor. Substitute for Returns use income data the IRS already has but ignore deductions, credits, and favorable filing status. The result is almost always a higher tax bill than a properly filed return would produce. If the IRS has filed or is about to file an SFR for you, filing your own return quickly – either within the 90-day notice window or after the fact – is the most effective way to reduce the inflated assessment and take control of the situation.