Most people think a tax lien is something the IRS "files." It isn't. The filing comes later, if it comes at all. The lien itself is created by statute, automatically, the moment three conditions line up. Nobody signs anything. No judge reviews it. You may not even know it exists.
That surprises people. It shouldn't stay a surprise, because once you understand how the lien is born, every other piece of lien law (filing, withdrawal, release, priority) makes a lot more sense.
The statute is one sentence long
Internal Revenue Code section 6321 is short. It says that if any person liable to pay a tax "neglects or refuses to pay the same after demand," the amount owed becomes a lien in favor of the United States upon all property and rights to property, real or personal, belonging to that person.
Read that again and pull out the moving parts:
- A person liable to pay a tax. That means a tax that has been assessed against you.
- A demand. The IRS has to ask you to pay.
- Neglect or refusal to pay. You did not pay in full after the demand.
When all three exist, you have a federal tax lien. The amount of the lien is not limited to the tax. Section 6321 expressly sweeps in interest, additional amounts, additions to tax, assessable penalties, and costs that accrue on top.
Step one: the assessment
An assessment is the formal act of recording your liability on the IRS books. Until the tax is assessed, there is nothing for a lien to secure. Section 6322 fixes the timing: unless another date is specifically set by law, the lien "shall arise at the time the assessment is made."
That is a critical detail. The lien does not date from the day you get the bill, or from the day you fail to pay. Once the other conditions are satisfied, it relates back to the assessment date. That date matters for priority disputes, for the life of the lien, and for the refiling deadline printed on any notice the IRS later files.
Assessments come from several places. You file a return showing a balance and don't pay it; the IRS assesses the tax shown. An audit closes and the IRS assesses the additional tax. The IRS prepares a substitute return and assesses from that. A penalty that is assessable without deficiency procedures, such as the Trust Fund Recovery Penalty, gets assessed directly. Each assessment is its own potential lien.
Step two: notice and demand
Section 6303 tells the IRS to give notice to each person liable for the unpaid tax, "as soon as practicable, and within 60 days," after making an assessment. The notice must state the amount and demand payment. It can be left at your home or usual place of business, or mailed to your last known address.
In practice, this is the first balance-due notice you receive after the assessment. The IRS describes the sequence the same way on its own lien page: the IRS assesses the liability, sends a bill explaining how much you owe, and you neglect or refuse to pay in time. Then the lien exists.
If you never received a notice because the IRS mailed it somewhere you no longer live, the "last known address" rule usually controls. The question is whether the IRS sent it to the address it reasonably should have used, not whether you actually opened it. Keep your address current with the IRS. It is cheap insurance.
Step three: you did not pay
The last condition is the simplest. If you pay in full after the demand, no lien arises for that assessment. If you pay part, or nothing, the unpaid amount is secured by the lien.
There is no minimum. The statute does not say "liens attach only above $10,000." That number you may have heard is an IRS internal guideline about when the IRS generally files a public notice of the lien, which is a different thing entirely. I cover that in when the IRS files a Notice of Federal Tax Lien.
What the lien reaches: everything
The words "all property and rights to property" are as broad as Congress could make them. The Supreme Court said as much in Drye v. United States, 528 U.S. 49, where the Court explained that the language of sections 6321 and 6331(a) reveals on its face that Congress meant to reach every interest in property a taxpayer might have.
Drye also set out the two-step test courts use. First, look to state law to decide what rights the taxpayer actually has in the property. Second, look to federal law to decide whether those rights count as "property" or "rights to property" for lien purposes. State law defines the bundle of rights. Federal law decides whether the lien grabs it. In Drye, a taxpayer's right to inherit his mother's estate was property the lien reached, even though he disclaimed the inheritance under state law.
So the lien covers your house, your car, your bank accounts, your brokerage account, your interest in a business, your accounts receivable, and your rights to future payments. The IRS's own summary puts it plainly: the lien attaches to all of your assets and to future assets acquired during the duration of the lien. That last part is its own topic, covered in how the lien reaches property you acquire later.
The lien is real even if nothing is recorded
This is the part most people miss. The statutory lien under section 6321 exists whether or not the IRS ever files a Notice of Federal Tax Lien. Lawyers sometimes call it the "secret lien" because nothing appears in the public records.
The secret lien is fully enforceable against you. What it is not enforceable against, at least not yet, are four categories of third parties: purchasers, holders of security interests, mechanic's lienors, and judgment lien creditors. Section 6323(a) says the lien is not valid against those people until a proper notice is filed. That is why the public notice exists, and it is the subject of the secret lien versus the public notice.
Why the assessment date is worth knowing
Get your account transcript for each tax period and find the assessment date. You will use it more than once.
- Lien life. Section 6322 says the lien continues until the liability is satisfied or becomes unenforceable by lapse of time. Under section 6502, the IRS generally has 10 years after assessment to collect, subject to events that suspend or extend that period. When collection becomes time-barred, the lien goes with it.
- Refiling. If the IRS files a notice, the required refiling period under section 6323(g)(3) is keyed to the assessment date: the one-year period ending 30 days after the expiration of 10 years after assessment.
- Priority. The lien relates back to assessment as against you. Against third parties, the filing date of the notice usually matters more.
One more practical point. A single notice of lien often lists several tax periods, each with its own assessment date. Treat each period as its own lien with its own clock. That is how the IRS treats them.
Common misunderstandings
"The IRS has to sue me first."
No. Unlike most private creditors, the IRS does not need a court judgment to have a lien. The statute does the work.
"I'm on a payment plan, so there's no lien."
Wrong. An installment agreement does not make the statutory lien disappear. The lien continues until the debt is paid or becomes unenforceable. The payment plan may affect whether the IRS files a public notice, and in some cases it supports a withdrawal request, but the underlying lien stays.
"The lien only covers my house."
No. The lien attaches to all property and rights to property. Real estate is just where people notice it first, because title companies search the records.
"If I move my property to someone else, the lien can't follow it."
A transfer does not necessarily cut off the lien. Depending on the facts, the IRS may treat the new owner as holding the property for you, which is covered in nominee and alter ego liens. Moving assets to dodge a lien tends to make the problem bigger, not smaller.
What to do with this information
If you owe the IRS and have received a balance-due notice, assume the lien exists. Then ask the questions that actually change your options:
- Has the IRS filed a public Notice of Federal Tax Lien? If so, where and when?
- Did you receive Letter 3172 offering a Collection Due Process hearing on the filing, and is the deadline still open?
- What are the assessment dates and collection expiration dates for each period?
- Would a payment arrangement or full payment open the door to withdrawal or release?
The lien is born quietly. Your job is to make sure you are not the last person to find out about it.
Knowledge is protection. Once you know the assessment dates, whether a notice was filed, and which deadlines are still running, you can pick a strategy instead of reacting to the next envelope.