IRS Form 15103: Why You Got It & How to Respond (CP59)

IRS Form 15103: Why You Got It & What to Do Now

Getting mail from the IRS can cause your heart to stop, especially if it’s a notice you weren’t expecting. If you’ve received a notice from the IRS, such as Notice CP59 or CP516, it means that they have no record of you filing a tax return for the previous year, and they want you to respond by completing Form 15103.

For many taxpayers in Minnesota and across the U.S., these notices come as a surprise — especially if they thought their return was already filed, or if their income was too low to require filing. Understanding what Form 15103 means, how to respond, and what happens if you ignore it is key to protecting yourself from penalties and inflated tax assessments.

Here’s what you need to know, including how BestTaxPro™ can help you get back on track.

Key takeaways

• Form 15103 means the IRS believes you didn’t file a tax return.
• Ignoring it can lead to a substitute for return, inflated tax liabilities, and collection actions.
• Your response depends on whether you already filed, plan to file, or weren’t required to.
• Submitting your own return protects you from exaggerated IRS assessments.
• Professional help matters when multiple years are missing or the IRS has already taken action.

Why You Received IRS Form 15103

The reason why you received IRS Form 15103 is that the IRS has no record of you filing your tax return for the prior year. Usually, the IRS will send this form along with either Notice CP59 or CP516, both of which let you know you have unfiled returns.

The IRS knows that you received income, and they want to know why you never filed. How does the IRS know about your income? The agency received information about your income from employers, banks, or other third parties who sent Forms W-2 or 1099 to the IRS, showing that you received taxable income.

At this point, the agency wants you to respond by completing Form 15103, but your next steps depend on the situation.

What Form 15103 Actually Means

Receiving this form doesn’t mean that you’re in trouble just yet. At this point, the IRS just wants you to address the unfiled returns or explain why you didn’t file.

The IRS uses computer programs to identify taxpayers who may have earned enough income to require a return but failed to file one. If the system flags you, the IRS gives you a chance to explain your situation before they take further action.

However, the IRS could be mistaken. Maybe you did file, but a processing error prevented the return from showing up in their system. Or maybe you don’t know to file, despite what your income documents indicate. Either way, you’ll need to take this notice seriously and respond promptly to clear things up.

Common Triggers for Receiving Form 15103

If you’ve received Form 15103, one or more of these common situations likely apply:

• Missing returns. You never filed your federal tax return for the year.
• Third-party income reports. Employers or payers filed W-2s or 1099s under your Social Security number, showing income you didn’t report.
• Filing mismatches. You filed under a different SSN or EIN, or your return was rejected and never resubmitted.
• Identity mix-ups. IRS records linked another taxpayer’s income to you in error.
• Processing delays. You filed by mail, but your paper return hasn’t been processed yet.

Whatever the cause, the IRS’s main objective is to get a tax return on file ora valid explanation from you.

What Happens If You Ignore Form 15103

If you don’t respond, the IRS may move forward with creating a Substitute for Return (SFR). This is a way for the IRS to prepare your tax return using limited data from W-2s, 1099s, and other income sources.

The problem? An SFR generally:

• Uses the least beneficial tax filing status – married filing separately or single.
• Fails to claim many deductions and credits you’re entitled to.
• Overstates your income tax balance, sometimes dramatically.
• Can lead to higher than necessary penalties and interest due to the inflated tax balance.

So, while it may be tempting to set the notice aside, doing nothing almost always makes things worse. Ignoring this form can trigger a chain reaction that’s hard to stop.

Here’s a step-by-step look at what typically happens if you don’t respond to Form 15103:

1. IRS creates a Substitute for Return (SFR). As noted above, they’ll use whatever information they have, which often results in an inflated balance, because there’s no statute of limitations on unfiled returns, the IRS can issue the SFR at any time.
2. Notice of Deficiency: Also called a 90-day letter, this notice gives you 90 days to respond to the SFR before it becomes final.
3. Assessment of tax liability. Once the IRS finalizes the SFR, they’ll assess what they believe you owe, including penalties and interest.
4. Additionally, penalties and interest: Penalties and interest will continue to accrue on your balance until you pay the balance. Penalties are capped at 47.5% of your balance, but there’s no cap on interest.
5. Collection action begins. The IRS may file a federal tax lien, garnish your wages, or levy your bank account to collect the amount due.

In simple terms, one unfiled return can evolve into a serious financial problem that follows you until it’s resolved.

How to Respond Based on Your Situation.

The best thing you can do is to file IRS Form 15103 to let the IRS know what is going on with your situation. Here’s a breakdown of the response options and how you should proceed.

1. You already filed your tax return.
   Check the box stating that you already filed and attach a copy of your signed return, if possible. If you e-filed, include confirmation from your preparer or tax software showing the submission date. If you filed within the last 8 weeks, the IRS says you don’t need to respond to Form 15103, but you may want to check your online IRS account to ensure they received your return.
2. You have not filed, but intend to.
   If you forgot or ran out of time to file, acknowledge that and mail in your completed tax return with the form. Do not wait for further contact from the IRS – file immediately to minimize penalties. However, you should strongly consider having a tax professional, such as an enrolled agent, file your returns. They can ensure you file the correct years and optimize your tax situation as much as possible.
3. You were not required to file.
   If your income was below the filing threshold and your situation didn’t trigger any other filing requirements, check the box indicating you were not required to file. You’ll need to briefly explain why (for example, “Retired, no earned income in 2025”)

If you’re uncertain about what to do next, you can indicate that you’re seeking help from a tax professional. This can temporarily pause IRS escalation while you find help and gather documentation.

What IRS Form 15103 Asks For

The form itself is short and relatively simple, but accuracy matters. Expect to provide:

• Basic identifying information (name, address, Social Security number)
• The tax year in question
• Your reason for not filing
• Any supporting explanation or documentation

After completing the form, you’ll mail it to the address listed on your CP59 or CP516 notice. Always keep a copy for your records and send it via certified mail with proof of delivery.

What to Do If You Discover You Actually Didn’t File

Sometimes, these IRS notices serve as a wake-up call – you thought a return was filed, but now you realize it wasn’t filed. This might happen if:

• Your preparer failed to transmit your return.
• You filed electronically, but the IRS rejected it for an error.
• You began the process, but never completed filing.
• You mailed your return, but it was lost in the mail.

In this case, you’ll need to file a return. The best next step is to gather your income transcripts and tax records. You can request these directly through the IRS’s “Get Transcript” online tool or by mail, or a tax professional can help you obtain these documents.

Then, either prepare the return yourself or work with a qualified tax professional who understands how to file back tax returns properly. Remember that filing the actual return will almost always result in a lower balance than an IRS-prepared SFR.

Why Avoiding an SFR Is So Important

And SFR (Substitute for Return) might sound like a helpful fallback, but for taxpayers, it’s anything but. The IRS calculates SFRs using income data only, without accounting for your:

• Correct filing status
• Dependents
• Deductions (including itemized deductions like mortgage interest or charitable contributions, as well as business deductions)
• Tax credits (like the Child Tax Credit or earned income credit)

This narrow view typically overstates your tax liability. Worse, once the IRS assesses an SFR-based balance, you may face higher penalties and interest until you replace the SFR with a valid return.

Avoid the risks of an SFR by filing your own return before the IRS steps in. Even if you’re late, submitting a complete, accurate return gives you more control and better results.

Penalties for Unfiled Tax Returns

Ignoring your filing obligation doesn’t just risk an inflated assessment; it also triggers multiple penalties that add up fast.

• Failure-to-file penalty: Usually 5% of the unpaid tax for each month your return is late (up to 25%)
• Failure-to-pay penalty: 0.5% per month of the unpaid balance after filing.
• Interest: Compounded daily on any unpaid portion of your tax.

The penalties and interest are backdated to your original due date. You can request penalty abatement, but the IRS doesn’t remove interest on the tax liability.

For Minnesota residents, these penalties can combine with state-level filing penalties if the Minnesota Department of Revenue is also missing a return. The takeaway? Filing late may cost you something. But filing never costs you more.

When to Involve a Tax Professional

Sometimes a missing return is easy to fix. Other times, it’s part of a larger tax history problem. A licensed tax resolution specialist or Enrolled Agent (EA) can step in when:

• You’re missing multiple years of returns.
• You need help filing individual or business tax returns.
• The IRS has already filed an SFR for you.
• You’re unsure which income was reported under your SSN.
• You think income has been incorrectly reported under your SSN.
• You’re facing lien, levy, or wage garnishment threats.
• You need help negotiating penalties or payment plans.

At BestTaxPro™, Joshua Webskowski – EA, CFP, NTPI Fellow, and U.S. Tax Court Practitioner. Josh Webskowski and the BestTaxPro^TM team help taxpayers understand IRS notices, filing requirements, collection issues, and available resolution options. They help taxpayers across Minnesota and the nation file missing returns, replace SFRs, and settle IRS balances efficiently.

Working with someone who understands how IRS collections operate gives you peace of mind – and often, substantial savings.

Taking the Right Next Steps

If you receive Form 15103, act quickly:

1. Read the notice carefully. Identify which tax year is missing.
2. Determine your situation. Figure out whether you filed, need to file, or weren’t required to.
3. Complete Form 15103 and mail it to the IRS with supporting documentation.
4. Submit your missing return if applicable.
5. Follow up with the IRS or your tax professional to confirm resolution.

Even if you can’t pay what you owe immediately, filing the return first protects you from harsher enforcement actions. Once your return is on file, options like installment agreements, penalty abatement, or Offers in Compromise become available.

How BestTaxPro™ Helps Minnesota Taxpayers

At BestTaxPro™, we’ve seen firsthand how intimidating IRS notices can be. But the good news is there’s nearly always a way to fix the situation once someone experienced takes a closer look.

From our Rockford, MN headquarters, we work with clients across Minnesota and the rest of the country to help them:

• File missing returns.
• Respond to SFRs, Notices of Deficiency, and other IRS notices.
• Communicate directly with the IRS to stop collections.
• Create legitimate repayment or settlement plans.
• Reduce penalties where possible.
• Rebuild financial stability for the long term.

That perspective helps our clients reach faster, fairer outcomes.

If you’ve received a CP59, CP516, or Form 15103, don’t panic, but don’t wait either. To discuss your unique situation, connect with Josh Webskowski and his team of IRS resolution professionals. We can help you respond correctly, regain compliance, and put your IRS stress behind you for good.

FAQs on Form 15103

What is IRS Form 15103?

Form 15103 is called a Return Delinquency Form. The IRS sends this form to people with unfiled returns. It asks them to prove they filed or explain why they didn’t.

What if I receive Form 15103 for a deceased person?

Complete the section of the form labeled “If the person addressed on this notice is deceased”. Note their date and death and whether you filed Form 1041 Income Tax Return for Estates and Trusts.

Why did I receive Form 15103 if I already filed?

If you filed in the last 8 weeks, the IRS is still processing your return. However, mailed returns may take even longer to process. Otherwise, the IRS may have lost your return, and you may need to refile it.