IRS NOTICE REFERENCE
Letter 3172
The IRS has filed a Notice of Federal Tax Lien (NFTL) for the unpaid balances located on the Form 668(Y)(c), Notice of Federal Tax Lien, enclosed with the letter 3172.
General information only. Not legal or tax advice.
Notice details
- Notice code
- Letter 3172
- Category
- Appeals and collection due process
- Severity tier
- Tier 4 — Escalation warranted. The notice involves collection enforcement, appeals rights, or significant penalty exposure.
- Governing law
- §6320; §6321; §6323 (Internal Revenue Code sections)
- Statutory response window
- 30-day window — always confirm the exact deadline against the date printed on your notice.
- Escalation flag
- This notice carries a forfeitable right, a hard statutory deadline, or criminal-preparer risk. It is flagged for escalation in the TaxRiskOS workflow.
- Source
- IRS Taxpayer Advocate Service
What this notice is
The IRS has filed a Notice of Federal Tax Lien (NFTL) for the unpaid balances located on the Form 668(Y)(c), Notice of Federal Tax Lien, enclosed with the letter 3172.
Source: IRS Taxpayer Advocate Service. Reproduced for reference. General information — not legal or tax advice.
What the IRS says to do
Review the Letter 3172 and the enclosed Form 668(Y)(c) for the type, tax period, assessment date, unpaid balance, and deadline to request a hearing. Pay the amount you owe, contact the person listed at the top of the notice for the current payoff amount, or consider a collection alternative to stop additional collection actions. See payment options for more information. If you disagree with the IRS filing a NFTL, you can request a Collection Due Process (CDP) by the deadline shown in the letter 3172 using the Form 12153 , Request for Collection Due Process or Equivalent Hearing. If you miss the CDP deadline, you may be able to request an Equivalent Hearing within one year of the notice date,
This is the IRS’s own guidance reproduced from the IRS notice page. It describes the IRS’s process — it is not legal or tax advice from TaxRiskOS.
Governing IRS procedure (Internal Revenue Manual)
The IRS’s own internal procedures for handling this notice type are documented in the Internal Revenue Manual:
- IRM 5.1.9 — 5.1.9 Collection Appeal Rights
- IRM 5.19.8 — 5.19.8 Collection Appeal Rights
- IRM 5.12.6 — 5.12.6 Appeals Processes Involving Liens
Reference to published IRS procedure. General information — not legal or tax advice.
Official IRS reference
Read the official notice page on IRS.gov: https://www.taxpayeradvocate.irs.gov/notices/letter-3172/
Related tools
TaxRiskOS is workflow software for practitioners — it captures the notice, computes the deadline, surfaces the escalation tier, and builds a document checklist. It documents process; it does not give advice or draft responses.
Check this notice’s deadline (free tool)