Introduction
A Form 15103 in your letterbox usually means one thing: the IRS has no processed Form 1040 on record for a tax year it thinks may need one. The notice alone doesn't say you owe tax.
For Australians, the confusion runs deeper. Living in Australia doesn't automatically end U.S. filing duties for citizens, green card holders, certain U.S. residents, or anyone with U.S.-source income.
The IRS sent out 3,157,055 non-filer notices in fiscal 2025, up from 1,679,141 the year before.
This guide covers how to read the notice, decide whether you need to file, complete the form, and respond before things escalate.
Key Takeaways
- Return delinquency means a missing or unmatched return; payment delinquency means assessed tax left unpaid.
- Form 15103 explains a filed return or no filing requirement. It never replaces a required Form 1040.
- Your notice sets the deadline, tax year, and submission channel.
- Ignoring it risks an IRS-prepared Substitute for Return built on incomplete information.
What Does Form 1040 Return Delinquency and Form 15103 Mean?
Return delinquency versus payment delinquency
Return delinquency means IRS records show no processed individual return for a year where third-party information suggests one may be due. Payment delinquency is different: tax has been assessed but remains unpaid. You can have a missing return without any final assessment yet.
The IRS finds likely non-filers by matching information returns, such as W-2 and 1099 data, against its filing records. Those wage and income reports can be incomplete, which is one reason notices go out in error.
Why you might get one even if you filed
Form 15103 can arrive when:
- Your return was filed recently and is still processing
- Your name or taxpayer identification number doesn't match IRS records
- The IRS has a processing problem
- Reported income doesn't reflect your full circumstances
Check the notice number and tax year first. CP59, CP515, CP516, and CP518 are successive stages of the non-filer process; CP518 is the final reminder.
What the form does
Form 15103 (Rev. June 2017) lets you explain the missing record or supply evidence before the IRS considers preparing its own return. Complete both sides, and follow the instructions on your actual notice rather than a generic online copy.
A quick decision path
- Already filed: send the requested signed copy or acceptable proof.
- Not required to file: explain why, with facts and figures.
- Required but unfiled: prepare and sign the correct prior-year return.
- Deceased taxpayer: enter the date of death and follow the representative rules.
Every answer must relate to the specific year named on the notice.
When Might an Australian Need to File a U.S. Return?
U.S. connections that create a filing duty
Living in Australia does not automatically end U.S. filing obligations. A duty can still arise from:
- U.S. citizenship
- Lawful permanent residence (a green card held at any time in the year generally means U.S. residence for tax)
- U.S. tax residency under the substantial presence test (31 days this year and 183 weighted days over three years)
- U.S.-source income, self-employment, investments, rental income, or a U.S. business
Thresholds vary by status and year. For 2025, a single filer under 65 generally must file at gross income of $15,750; for 2024 it was $14,600. Married filing separately is $5.
Net self-employment earnings of $400 or more trigger filing on their own. Check the instructions for your delinquent year.
Form 1040 versus Form 1040-NR
Citizens and resident aliens generally use Form 1040. Nonresident aliens generally use Form 1040-NR when they have a U.S. trade or business or U.S.-source income not fully taxed through withholding.
Choosing correctly means reviewing:
- Residency and citizenship
- Income source and treaty position
- The tax year involved
Foreign income, accounts and common assumptions
U.S. citizens and resident aliens generally report worldwide income. Don't assume any of these removes the requirement:
- Australian tax already paid
- The foreign earned income exclusion (excluded earnings still count toward filing thresholds, per IRS Publication 54)
- The U.S.-Australia treaty, whose saving clause generally preserves U.S. taxation of citizens and residents
Foreign account reporting runs separately. An FBAR is required when aggregate foreign accounts exceed $10,000 at any point in the year, and Form 8938 has its own higher thresholds. Australian superannuation can raise reporting questions here, so get specific advice.
Establishing that no filing was required
Review filing status, age, dependency, income type, total income, and self-employment earnings against that year's IRS instructions. Then state the facts on the form. A bare "I didn't need to file" isn't enough.
When Form 15103 alone isn't enough
Seek a broader review if any of these apply:
- Multiple unfiled years
- Self-employment or foreign investments
- An estate or uncertain residency
- A prior IRS-prepared return
How to Complete and Submit Form 15103
Prepare first
Gather:
- The full notice, with tax year and notice number confirmed
- The current Form 15103
- Prior returns and e-file acceptance records
- W-2s, 1099s, withholding records, and foreign-income documents
- Evidence for your explanation
Wage and income transcripts and account transcripts are available through your IRS Online Account and can fill gaps in your records.
Taxpayer information
Enter your name, taxpayer identification number, address, phone number, and preferred call time exactly as requested. Mismatched details can stop the IRS from linking your response to the right account.
If you already filed
Provide the tax year, filing date and method, the forms included, and a signed and dated copy of the return. Keep proof of e-file acceptance, mailing, delivery, or fax. For CP516 and CP518, no action is needed if you filed within eight weeks; otherwise follow the notice.
If you weren't required to file
Give your filing status, age and dependency facts where asked, total income for the year, and relevant residency or citizenship details. Add a short explanation and attach documents that support it.
If you never filed a required return
Form 15103 does not replace the Form 1040. Prepare and sign the correct prior-year return and schedules, then send them as the notice directs. Use IRS transcripts and reliable records, and don't guess at income, deductions, filing status, or foreign reporting items.
The IRS e-file system accepts the current year plus two prior years. Older returns generally must be filed on paper as the notice directs.
Deceased taxpayers and prior-year credits
For a deceased taxpayer, enter the date of death. A court-appointed representative or surviving spouse signs; otherwise the responsible person signs as personal representative. Refund claims may need Form 1310. Choosing a credit or refund option doesn't replace the return or guarantee a refund.
Signature, submission and follow-up
- Complete both pages and sign and date where required
- Use only the address, fax number, or online channel named in your notice
- Keep a full copy and proof of submission
Online submission varies. CP59 allows Form 15103 upload through Online Account, while CP516 and CP518 describe online submission only for Form 15103 explaining no filing requirement.
Getting professional help
Consider professional help when you face:
- Multiple unfiled years
- Foreign income or accounts
- Self-employment
- Estate issues or missing records
- A possible prior IRS-prepared return
VJM Global supports eligible cross-border taxpayers with Form 1040 and 1040-NR preparation, document organisation, and coordination with U.S.-compliant tax professionals. For Australians with several overdue years, the IRS's Streamlined Foreign Offshore Procedures may apply to non-wilful cases, generally covering three years of returns and six years of FBARs.
What Happens After You Respond or Ignore the Notice?
After you respond
Watch your IRS account and mail, keep proof of submission, and answer any further requests quickly. Silence doesn't mean the case is closed. The IRS does not publish a separate turnaround time for Form 15103, so check the IRS processing status page and your notice.
If you ignore it
Cases don't all follow one path, but a typical progression is:
- Further non-filer notices
- An IRS-prepared Substitute for Return
- A notice of deficiency
- Collection activity
An IRS-prepared return relies only on information the IRS holds. It allows the standard deduction but may omit credits, dependents, expenses, or a better filing status. Filing your own return lets the IRS consider those claims.
Penalties, interest and deadlines
- Failure to file: 5% per month or part month, capped at 25%
- Failure to pay: 0.5% per month, capped at 25%
- Minimum penalty for returns over 60 days late: the smaller of 100% of the tax or $525 for returns due after 31 December 2025
- Interest: 7% for individual underpayments in October to December 2026
Filing and payment are separate issues. File even if you can't pay now. Relief may be available through First-Time Abatement (three-year clean history) or reasonable cause.
Watch the deficiency deadline closely. The Tax Court petition window is 90 days from mailing, or 150 days if the notice is addressed outside the U.S. Filing a return does not extend that window.
Refund claims have their own limits, generally three years from filing, so very late filers can lose refunds.
Frequently Asked Questions
What is return delinquency?
It means the IRS has no processed record of a return it expects from you. That differs from payment delinquency, where assessed tax remains unpaid.
Does Form 15103 mean I owe taxes?
No. It flags a missing or unmatched return record. Whether tax is owed depends on your filing obligation and return information.
Do I need to file a U.S. Form 1040 if I live in Australia?
Only when U.S. filing rules apply to you. Citizenship, green card status, U.S. tax residency, U.S.-source income, and that year's rules decide it.
What should I do if I already filed the missing Form 1040?
Follow the notice and send the requested signed return copy or accepted proof of filing. Keep evidence that you responded.
What if I was not required to file a tax return?
Use Form 15103 to explain why. Include that year's income and status details, and attach supporting documents where helpful.
What happens if I ignore Form 15103?
Expect more notices and possibly a Substitute for Return that omits deductions or credits, plus penalties, interest, and collection action. Review the notice promptly.
