Substitute for Return (SFR)
A return the IRS prepares for you when you do not file. It may omit deductions you were entitled to, and it starts a 90-day clock.
Full Definition
If you fail to file, the IRS states it may file a substitute return for you, and that this return might not give you credit for deductions and exemptions you may be entitled to receive. The IRS then sends a Notice of Deficiency, CP3219N — also called a 90-day letter — proposing a tax assessment.
The deadline matters. The IRS states you will have 90 days to file your past due tax return or file a petition in Tax Court, and that if you do neither it will proceed with the proposed assessment. The IRS also states that if you have received CP3219N you cannot request an extension to file.
A substitute return is not the end of the road: the IRS states that even after it files one, it is still in your best interest to file your own return to take advantage of any exemptions, credits and deductions you are entitled to receive, and that it will generally adjust your account to reflect the correct figures. The proposed assessment leads to a tax bill, and an unpaid bill triggers the collection process — which the IRS says can include a levy on wages or a bank account, or the filing of a notice of federal tax lien.
What to do next
If you have received CP3219N, work from the date on the notice itself, not the day you opened it — the notice prints a last date to petition. Inside that window, file the past due return or petition the Tax Court. The IRS states you cannot request an extension once CP3219N is issued.
Sources
- Filing past due tax returns — Internal Revenue Service, retrieved 2026-08-20
Last reviewed 2026-08-20 by Tax Resolution Clarity editorial.
Sourced to primary IRS materials and editorially reviewed. Not reviewed by a tax professional. Not tax advice.
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Where to go next
The IRS publishes the rules this page describes. Your own notice governs your dates.