Tax Resources: IRS Notice Decoder, Glossary and FAQs | Delta Tax Group

Resources

Decode your notice. Understand the language. Get the answer.

Every IRS letter carries a CP or LT code near the top that identifies exactly what the agency wants and how urgent it is. This page decodes the codes people receive most often, defines the terms used in tax resolution, and answers the questions that come up before anyone picks up the phone. Nothing here requires you to hire anyone.

If your notice mentions a deadline or the word levy, read the notice decoder first. Some response windows are short and the rights attached to them do not come back.

Find your notice code Open the glossary

Do not ignore it, and do not rush to pay it.

Both mistakes are common and both are expensive. A notice left unopened escalates on its own schedule. A notice paid without being read sometimes settles an amount that was never correct in the first place.

Find the code

Look for a CP or LT code in the upper or lower right corner. That code identifies the notice precisely. Keep the envelope too — the postmark can matter.

Find the date

Response windows run from the date printed on the letter, not the day you opened it. Write that date down before anything else.

Check the tax year

A notice covers specific periods. Knowing which year it concerns tells you whether it relates to a return you filed, one you did not, or one the IRS filed for you.

Decide the path

Pay, dispute, appeal, or request a resolution program. Which is available depends on the notice, the deadline and your finances — not on preference.

Notice decoder

Find your IRS notice code.

Most IRS letters carry a CP or LT code near the top. Type it below, or type a word like levy, lien, audit or refund. The table filters as you type. Every entry states what the notice is, how urgent it usually is, and what it typically means for your options.

Search by code or keyword

Common IRS notices and letters. General guidance only — the notice itself governs.
Code	What it is	What it usually means for you
`CP11` Act soon	Changes were made to your return and a balance is now due.	Check the change before paying. If you disagree, the notice explains how to respond and by when.
`CP12` Routine	Your return was corrected and your refund amount changed.	Usually informational. Review the correction — an adjustment can affect later years.
`CP14` Act soon	The first bill for an unpaid balance, including penalties and interest.	This starts the collection sequence. Responding now keeps every option open.
`CP49` Routine	Your refund was applied to a tax debt you owe.	Confirms an offset. Worth checking which year absorbed the refund.
`CP59` Act soon	The IRS has no record of a return being filed for a given year.	Filing compliance is a prerequisite for most resolution programs. Do not assume the year is closed.
`CP71 / CP71C` Routine	An annual reminder that a balance is still outstanding.	Often arrives while an account sits in a non-collection status. Interest is still accruing.
`CP90` Time-sensitive	Final notice of intent to levy and notice of your right to a hearing.	Generally opens a 30-day window to request a Collection Due Process hearing. Treat as urgent.
`CP91` Time-sensitive	Final notice before levy on Social Security benefits.	Benefits can be levied after the window closes. Act before the date on the letter.
`CP161` Act soon	A balance is due on a business account.	Business balances can escalate to owner-level exposure where payroll tax is involved.
`CP162` Act soon	A penalty has been assessed for a late or incomplete partnership or S-corporation return.	Penalty abatement is sometimes available. The compliance history matters.
`CP501` Act soon	A first reminder that a balance remains unpaid.	Still early in the sequence. Options are widest here.
`CP503` Act soon	A second reminder, following an unanswered CP501.	Escalation has begun. The next notice carries levy language.
`CP504` Time-sensitive	Notice of intent to levy your state tax refund and search for other assets.	Serious, but it is not the final notice that carries hearing rights. That one comes next.
`CP504B` Time-sensitive	The business version of CP504.	Same escalation, applied to a business account.
`CP508C` Time-sensitive	Your tax debt has been certified to the State Department as seriously delinquent.	Can affect passport issuance or renewal. Reversal requires a qualifying resolution.
`CP523` Time-sensitive	Intent to terminate your existing installment agreement.	A default can reinstate the full balance and restart collection. Time-sensitive.
`CP2000` Act soon	Proposed changes because income reported by third parties does not match your return.	A proposal, not a bill. Third-party documents are sometimes wrong or duplicated.
`CP2501` Act soon	An earlier-stage version of the underreporter notice.	Responding at this stage can prevent a CP2000 assessment entirely.
`CP3219A` Time-sensitive	Statutory notice of deficiency, often called the 90-day letter.	The deadline to petition the U.S. Tax Court before the tax is assessed. The date is strict.
`LT11 / Letter 1058` Time-sensitive	Final notice of intent to levy and notice of your right to a hearing.	Letter 1058 typically comes from an assigned revenue officer. Both open the CDP window.
`LT38` Routine	A reminder that overdue tax remains on the account.	Collection notices resuming after a pause. Not the end of the sequence.
`Letter 3172` Time-sensitive	Notice of federal tax lien filing and your right to a hearing.	A lien is now public record. Withdrawal, discharge or subordination may be available.
`Form 668-W` Time-sensitive	Wage levy served on your employer.	Money is being taken from each paycheck. Release depends on hardship or an arrangement.
`Form 668-A` Time-sensitive	Bank levy served on your financial institution.	The bank holds the funds for a limited period before remitting. The window is short.
`Letter 525 / 531` Time-sensitive	Examination report, then notice of deficiency following an audit.	Appeal rights attach to specific dates on each letter.
`Letter 5071C` Act soon	Identity verification is required before a return can be processed.	Usually resolved by verifying online or by phone. Not a collection notice.

No notice matched that search. Check the code against the letter — the character before the number is the letter O in some fonts and a zero in others. If it still does not match, the decoder above covers the most common notices, not every one the IRS issues.

This decoder is general information, not advice about your notice. The IRS issues many letters not listed here, and the wording on your own notice governs. Look up any notice by number at IRS.gov.

Triage

When a notice becomes urgent.

Most notices are reminders. A few are the last step before the IRS can take money, and they read differently. These are the phrases that change the timeline.

If your letter contains any of these, the response window matters more than anything else on this page. State agencies use their own wording and their own procedures, which are not identical to the federal ones.

"Final notice of intent to levy" — combined with "notice of your right to a hearing," this generally starts a 30-day window to request a Collection Due Process hearing. Letting it lapse removes an appeal right that does not return.
"Notice of deficiency" — often called the 90-day letter. It is the deadline for petitioning the U.S. Tax Court before the tax is assessed.
"Intent to terminate your installment agreement" — an existing plan is about to default, which can reinstate the full balance and restart collection.
"Certification to the State Department" — a seriously delinquent tax debt has been certified, which can affect passport issuance or renewal.
Any letter from a revenue officer — a named individual with direct authority is assigned to your case, rather than an automated notice stream.

Glossary

The language, in plain English.

Tax resolution has its own vocabulary, and firms sometimes rely on you not knowing it. These are the terms that appear on notices, in engagement letters and in conversations with the IRS, defined without jargon.

Search the glossary

Assessment: The formal recording of a tax liability on your IRS account. Collection timelines run from the assessment date, not the tax year, which is why two balances on one return can expire at different times.

Allowable living expenses: The living costs the IRS permits when calculating what you can afford to pay. Largely standardised by household size and location, which is why an honest budget and an allowable one can differ.

Back taxes: Tax owed for a prior year that was never paid in full. The balance normally includes penalties and interest accrued since the original due date.

Collection Due Process (CDP) hearing: An appeal available after certain levy and lien notices, generally within 30 days. It pauses collection while pending and preserves the right to judicial review.

Collection statute expiration date (CSED): The date the IRS generally loses the ability to collect a balance, usually ten years from assessment. Certain events suspend or extend it.

Currently Not Collectible (CNC): A hardship determination that suspends active collection because paying would prevent you meeting basic living expenses. The debt and interest remain.

Discharge (of a lien): Removal of a federal tax lien from one specific piece of property, typically so a sale can close, while the lien remains on everything else.

Doubt as to collectibility: The most common basis for an Offer in Compromise: an argument not that the tax is wrong, but that the full amount cannot be collected before the statute expires.

Equitable relief: A form of innocent spouse relief available when the other two forms do not apply but holding you liable would be unfair on the facts.

First-time abatement (FTA): An administrative penalty waiver for taxpayers with an otherwise clean recent compliance history. It does not require a reason for the failure.

Form 433-A / 433-F: Collection information statements disclosing income, expenses and assets. The figures entered here set payment amounts, often for years.

Form 656: The application for an Offer in Compromise, submitted with supporting financials and, unless waived, a fee and an initial payment.

Form 2848: Power of Attorney and Declaration of Representative. The authorization that lets someone obtain your records and speak to the IRS for you.

Innocent Spouse Relief: Relief from liability for tax arising from a spouse's or former spouse's items on a joint return. Three forms exist, each with its own time limits.

Installment agreement: A monthly payment plan with the IRS. Requirements vary with the balance; larger balances generally require financial disclosure.

Levy: The actual taking of property or funds — wages, bank accounts, receivables. Distinct from a lien, which is a claim rather than a seizure.

Lien (federal tax lien): A legal claim against your property arising from an unpaid balance. It does not take anything, but it attaches to what you own and becomes public record when filed.

Notice of deficiency: The 90-day letter. The deadline to petition the U.S. Tax Court before the proposed tax is assessed.

Offer in Compromise (OIC): An agreement settling a balance for less than the full amount, accepted when the offer equals or exceeds what the IRS could reasonably collect before the statute expires.

Partial-pay installment agreement (PPIA): Monthly payments not expected to retire the balance before the collection statute expires. The remainder becomes uncollectible when it does.

Penalty abatement: Removal or reduction of assessed penalties, through first-time abatement or documented reasonable cause. Interest is treated separately and rarely abated.

Reasonable cause: The standard for penalty relief based on facts: serious illness, disaster, destroyed records, or reliance on incorrect professional advice. Inability to pay alone generally does not qualify.

Reasonable collection potential (RCP): The IRS calculation at the centre of every Offer in Compromise: realizable asset equity plus future income measured against allowable expenses.

Revenue officer: An IRS employee assigned to a specific case with authority to levy, summon records and visit in person. A named officer signals escalation beyond automated notices.

Subordination: Allowing another creditor to take priority over a federal tax lien, usually so a refinance can close. The lien is not removed.

Substitute for return (SFR): A return the IRS files on your behalf when you do not. It typically excludes deductions and credits you were entitled to, so the balance is often overstated.

Transcript: The IRS record of your account. Account transcripts show assessments, payments and collection activity; wage and income transcripts show what third parties reported about you.

Trust Fund Recovery Penalty (TFRP): A personal assessment against owners, officers or others found responsible for unpaid payroll taxes withheld from employees. Entity structure does not prevent it.

Withdrawal (of a lien): Removal of the public notice of a federal tax lien, which can follow a resolution such as a direct-debit installment agreement. Different from release.

No term matched that search. Try a shorter word — searching "levy" will find every entry that mentions one.

Frequently asked questions

The questions people ask first.

What happens if I ignore an IRS notice?

The sequence continues without you. Reminder notices escalate to a final notice of intent to levy, and once that window closes the IRS can levy wages or bank accounts without returning to court. Penalties and interest keep accruing throughout, and appeal rights attached to specific notices expire on their dates. Ignoring a notice does not pause anything — it only removes you from the conversation about what happens next.

Is the amount on my notice always correct?

Not always. If the IRS filed a substitute return because you did not file, the assessment typically excludes deductions and credits you were entitled to claim, so the balance can be significantly overstated. Underreporter notices such as CP2000 are proposals based on third-party documents, and those documents are sometimes wrong or duplicated. Checking the assessment before paying it is worth the time.

Can I call the IRS myself?

Yes, and for a simple question about a balance or a payment plan many people should. Have the notice in front of you and expect to wait. Be aware that anything you say about your finances can be recorded on the account and used later — which is the main reason people choose representation once a case involves several years, active collection, or a financial disclosure.

How do I get my IRS transcripts?

You can request them yourself through the IRS online account or by mail, at no cost. Account transcripts show assessments, payments, penalties and collection activity by year; wage and income transcripts show what third parties reported about you, which is often how missing records get reconstructed. A representative with a Form 2848 on file can also obtain them on your behalf.

Does the IRS ever call or text first?

First contact about a tax debt normally arrives by mail. The IRS does not open contact by text message or social media, and it will not demand immediate payment by gift card, wire transfer or cryptocurrency, or threaten to send police to your door. If a caller does any of that, it is a scam. A genuine revenue officer may visit in some circumstances, and you can ask for credentials.

How long can the IRS collect a tax debt?

Generally ten years from the date the tax was assessed, known as the collection statute expiration date. Certain events suspend or extend that clock — a pending offer, a bankruptcy, a Collection Due Process request, or time spent outside the country. Because the date is calculated per assessment rather than per year, two balances on the same return can expire at different times.

Will a tax debt show up on my credit report?

The major consumer credit bureaus no longer include tax liens on consumer credit reports. That does not make a lien invisible: it is a public record, and lenders, title companies and underwriters find it during a refinance or a sale. Entering an installment agreement or submitting an offer does not itself create a credit entry.

Do I need a professional, or can I handle this myself?

A single recent year with a manageable balance and a straightforward payment plan usually does not need representation, and the IRS publishes the forms and programs at no cost. Representation earns its fee when several years are involved, when returns are missing, when collection has started, when a financial disclosure will set a payment for years, or when a business tax issue has created personal exposure.

These answers are general information, not tax or legal advice for your situation, and program rules change. Please do your own research to verify the accuracy of content on our website.

Go to the source

Official sources, free to use.

Everything on this page is a plain-language summary. These are the authorities it summarises, and none of them charge anything. If a firm discourages you from reading them, that tells you something.

Understanding your IRS notice or letter — look up any notice by its number.
Online payment agreement — apply for an installment plan directly.
Offer in Compromise — the program rules and the pre-qualifier tool.
Get transcript — your own account and wage records, at no cost.
Taxpayer Advocate Service — an independent organisation within the IRS that helps when normal channels have not worked.
Taxpayer Bill of Rights — the ten rights you have in every dealing with the IRS.

State tax matters are governed by your own state's taxing authority, whose programs, deadlines and procedures differ from the federal ones.

Still not sure what your notice means?

Bring the letter. We will tell you which notice it is, what deadline it carries, and what your realistic options are — including when the answer is that you do not need to hire anyone.

Request a confidential consultation Call (747) 666-1561

Confidential. No guaranteed outcome — eligibility for any resolution program depends on the facts of your case and is determined by the taxing authority.

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