A letter from the IRS Holtsville office (1040 Waverly Avenue, Holtsville, NY 11742) is real IRS mail from the Brookhaven campus, which handles correspondence, account issues, and specialized work like Offer in Compromise processing for much of the country. What matters most is the notice number printed in the upper-right corner of the first page. That code tells you exactly what the IRS wants and how many days you have to act.
First, Make Sure the Letter Is Genuine
Scam mail imitating the IRS is common, and it usually falls apart on details. Every real IRS notice carries a notice number that begins with “CP” or “LTR” in the upper-right corner of page one.1Internal Revenue Service. Understanding Your IRS Notice or Letter You can look that number up on IRS.gov and read exactly what it means before you respond to anything.
The IRS starts contact by mail, not by phone, text, or email. A genuine letter never demands payment by gift card, wire transfer, or cryptocurrency, and it never threatens immediate arrest. If something feels off, call the IRS using a number listed on IRS.gov rather than a number printed on the letter itself.
One important variant: if the letter asks you to verify your identity because someone may have filed under your Social Security number, it will usually be Letter 5071C, 4883C, or 5747C. Follow the instructions in the specific letter. If you suspect identity theft but haven’t received one of those letters, file Form 14039, the Identity Theft Affidavit.2Internal Revenue Service. When to File an Identity Theft Affidavit
Read the Notice Number to Learn What the IRS Wants
The notice code drives everything else. A few show up more often than the rest.
CP14 is the most common IRS notice. It says your return was processed and you owe a balance, and it asks for payment within 21 days.3Taxpayer Advocate Service. Notice CP14 – Balance Due $5 or More, No Math Error It shows the tax year, the amount, and any penalties or interest already added. Nothing is in dispute at this stage; the IRS is billing you for what your own return reported.
CP2000 is a proposal to change your return. The IRS’s Automated Underreporter system matches W-2s and 1099s from employers, banks, and brokerages against what you filed, and a mismatch triggers this notice. You have 30 days to respond, or 60 if you live outside the United States.4Internal Revenue Service. Topic No. 652, Notice of Underreported Income – CP2000 The proposed tax often looks worse than it is, because the IRS may not have your cost basis on a stock sale or credits and deductions you’re entitled to claim.
Other letters from Holtsville deal with refund offsets applied to past-due debts, requests for information to process an amended return, or specific penalty assessments. Whatever the code, the sections labeled “What you should do” and “If you agree” or “If you disagree” spell out the response the IRS is looking for.
If your letter includes a penalty, know that some penalties can be removed. First-time penalty abatement is available if you were compliant for the three prior tax years. Reasonable cause relief applies when circumstances outside your control (serious illness, natural disaster, a death in the immediate family) kept you from filing or paying on time; lack of money by itself doesn’t qualify, though it can be part of a broader picture.5Internal Revenue Service. Penalty Relief for Reasonable Cause Interest, unlike penalties, cannot be waived.
How to Respond by the Deadline
Read the whole letter before you do anything. Circle the deadline. Then decide whether you agree, disagree, or need more time.
If You Agree
Sign the response form and return it. Pay as much as you can by the deadline to stop penalties and interest from continuing to build. You can pay online with IRS Direct Pay, by phone through EFTPS, or by check to the address on the notice.
If You Disagree
Gather documents that back your position. For a CP2000 about unreported income, that might be a corrected 1099, brokerage statements showing your cost basis, or records showing the income was already reported under a different line. For business deductions, you need contemporaneous records showing the amount, date, business purpose, and business relationship of each expense.6Office of the Law Revision Counsel. 26 USC 274 – Disallowance of Certain Entertainment, Etc., Expenses Saying a deduction was legitimate, without paper to prove it, will not work.
Write a cover letter that names the notice number and your Social Security number, addresses each item point by point, and asserts reasonable cause if you’re contesting a penalty. Attach copies, never originals, and keep a full duplicate of the packet for yourself.
Sending the Response
Use the exact address on the notice. Mail sent to the wrong IRS office can sit unprocessed for weeks and push you past the deadline.
For a CP2000, Holtsville accepts faxed responses at 877-477-9599, which gives you a transmission confirmation the same day.7Internal Revenue Service. Understanding Your CP2000 Series Notice If you mail instead, use USPS Certified Mail with Return Receipt Requested. Under the mailbox rule, the postmark date counts as your filing date, so you’re protected even if the IRS takes weeks to open the envelope.8Office of the Law Revision Counsel. 26 USC 7502 – Timely Mailing Treated as Timely Filing and Paying Keep the certified receipt.
If the deadline is coming up and you can’t meet it, call the number on the notice before it passes and ask for an extension. Going silent lets the IRS finalize its proposed changes automatically.
You can also view many notices and your account activity through your IRS Online Account at IRS.gov, which is useful for confirming that the IRS has received and processed your response. Processing can take anywhere from 30 to 120 days or longer.9Internal Revenue Service. Online Account for Individuals
If You Owe but Can’t Pay in Full
The worst move is doing nothing. The IRS offers formal payment arrangements, and getting into one early keeps the case from escalating to liens and levies.
Short-Term Payment Plan
If you can pay off the balance within 180 days, you can set up a short-term plan with no setup fee, whether you apply online, by phone, or by mail.10Internal Revenue Service. Payment Plans; Installment Agreements Interest and the failure-to-pay penalty keep accruing until the balance is zero.
Installment Agreement
If you need longer, you can set up monthly installments. Setup fees vary by application and payment method:
- Direct debit, applied online: $22
- Direct debit, applied by phone or mail: $107
- Other payment methods, applied online: $69
- Other payment methods, applied by phone or mail: $178
- Low-income taxpayers with direct debit: fee waived
- Low-income taxpayers, other methods: $43, which may be reimbursed
Applying online is consistently cheapest.
Offer in Compromise
An Offer in Compromise settles the debt for less than you owe when full payment would create genuine financial hardship or when the amount owed is itself in doubt. It requires Form 656, a detailed financial disclosure on Form 433-A (individuals) or 433-B (businesses), a $205 application fee, and an initial payment. Low-income applicants who meet certification guidelines don’t pay the fee or the initial payment.11Internal Revenue Service. Offer in Compromise The IRS rejects most offers, so professional help pays off here.
Currently Not Collectible
If paying anything at all would leave you unable to cover basic living expenses, you can ask the IRS to classify your account as Currently Not Collectible, documenting your income, expenses, and assets on Form 433-A.12Internal Revenue Service. Currently Not Collectible Procedures Active collection pauses while you’re in this status, though interest and penalties keep accruing and the IRS reviews the case periodically.
If You Disagree With the Final Decision
If the IRS finalizes a change against you, you still have appeal rights, but the deadlines are strict.
You can request a conference with the IRS Independent Office of Appeals by filing a written protest within the timeframe on the letter, usually 30 days. If the total disputed amount for each period is $25,000 or less, you can use the simplified Small Case Request on Form 12203 instead of a formal protest.13Internal Revenue Service. Preparing a Request for Appeals Send the protest to the IRS office listed on the letter, not directly to Appeals.
If the IRS sends a Notice of Intent to Levy, you have 30 days from the date of that notice to request a Collection Due Process hearing on Form 12153. Filing on time pauses collection.14Internal Revenue Service. Collection Due Process (CDP) FAQs Miss it, and you can still request an “equivalent hearing,” but it will not stop the levy.
If the IRS issues a Notice of Deficiency (the “90-day letter”), you have exactly 90 days from the mailing date to file a petition with the U.S. Tax Court, or 150 days if the notice is addressed outside the United States.15United States Tax Court. Starting a Case The Tax Court cannot extend that deadline. Filing on time lets you dispute the tax without paying it first. Miss the window and the IRS assesses the full amount; your only remaining route is to pay and then sue for a refund in a different court.
What Ignoring the Letter Costs
Silence is the most expensive response. If you don’t answer a CP2000 by its deadline, the IRS assumes its numbers are right and assesses the full tax, penalties, and interest. Follow-up demand notices come next. Then a Notice of Intent to Levy, which gives the IRS authority to seize wages, bank accounts, and other property.16Office of the Law Revision Counsel. 26 USC 6331 – Levy and Distraint The IRS can also file a federal tax lien, damaging your credit and your ability to sell or refinance assets.
If your total federal tax debt (including penalties and interest) tops $66,000, the IRS can certify it to the State Department, which may deny or revoke your passport. That threshold adjusts annually.17Internal Revenue Service. Revocation or Denial of Passport in Cases of Certain Unpaid Taxes
The IRS has 10 years from the date of assessment to collect through levy or court action.18Office of the Law Revision Counsel. 26 USC 6502 – Collection After Assessment That’s a long runway for penalties and interest to compound. Responding on time, even if you can’t pay, keeps the payment plan and settlement options open.
Where to Get Help
You have the right to be represented before the IRS.19Internal Revenue Service. Taxpayer Bill of Rights To authorize someone to act on your behalf, file Form 2848 (Power of Attorney and Declaration of Representative). The representative generally has to be an attorney, CPA, or enrolled agent; an unenrolled preparer can represent you only on a return they prepared.20Internal Revenue Service. Instructions for Form 2848
Low Income Taxpayer Clinics offer free or low-cost help to qualifying taxpayers, including those who speak English as a second language. Each clinic sets its own eligibility criteria within IRS guidelines.21Taxpayer Advocate Service. Low Income Taxpayer Clinics
The Taxpayer Advocate Service is a separate backstop for when the normal IRS channels have broken down: months of no response, or an IRS action causing immediate financial hardship. File Form 911 to request help.22Taxpayer Advocate Service. Submit a Request for Assistance