The Secure Processing Center in Suwanee, GA (P.O. Box 3826, Suwanee, GA 30024) is a legitimate IRS mail facility. It’s part of the IRS Lockbox program run by the U.S. Treasury’s Bureau of the Fiscal Service, which authorizes certain banks (called financial agents) to receive tax payments and forward accompanying documents to the IRS.1Fiscal.Treasury.gov. IRS Lockbox If a notice arrived from that address, it almost certainly came from the IRS. You should still verify the specific notice before paying anything or sending documents back.
The Suwanee site isn’t an office you can visit. No IRS employees sit at that P.O. box to take questions. It’s a processing operation, and the IRS directs taxpayers in certain states to send returns and payments there based on where they live and what form they’re filing.
Confirm the Notice Before You Act
The fastest way to confirm a mailed notice is real is to log in to your IRS online account at irs.gov. Under “Notices and Letters” you’ll see digital copies of most notices the IRS has sent you.2Internal Revenue Service. Online Account for Individuals – Frequently Asked Questions If the letter in your mailbox matches a notice in your account, it’s legitimate. Setting up the account takes a few minutes if you don’t already have one.
Every genuine IRS notice has a CP or LTR number printed in the upper or lower right corner. That number tells you exactly what you’re dealing with, and irs.gov has a plain-language explanation page for each one.3Internal Revenue Service. Understanding Your IRS Notice or Letter You can also call the IRS at 800-829-1040 with the notice in front of you; the representative will ask for the notice number and the tax year.
How to Tell a Scam From the Real Thing
The IRS does not initiate contact through email, text message, or social media. It does not accept gift cards or prepaid debit cards. It does not call with automated messages threatening arrest, deportation, or loss of your driver’s license.4Internal Revenue Service. How to Know It’s the IRS If any of those things are happening alongside the letter, treat it as a scam regardless of what the envelope says.
Signs the mail itself is genuine: a CP or LTR number on the page, a specific tax year referenced, instructions that point you to irs.gov, and payment instructions that direct checks to the “United States Treasury” rather than to a person or a company.
Read the Notice Before You Do Anything Else
Every IRS notice spells out the specific action the agency wants and almost always includes a deadline. Common deadlines are 30 days for audit-related letters and 90 days for a statutory notice of deficiency, but the date printed on your notice is the one that controls.
If the notice says the IRS changed your return, compare the IRS’s numbers against your original filing. If you agree with the change, note it on your copy and keep it. You only need to take further action if the IRS is asking for more information, you owe a balance, or you disagree.3Internal Revenue Service. Understanding Your IRS Notice or Letter
When you need to mail a response, send it to the address printed on the notice. That’s not necessarily the Suwanee P.O. box; the IRS routes responses to different locations depending on the issue. Keep copies of everything. Response processing is slow — as of early 2026, paper correspondence was running weeks behind.5Internal Revenue Service. Processing Status for Tax Forms Don’t send a duplicate just because you haven’t heard back; that slows things down further.
If a deadline is close, use certified mail. Under federal law, the postmark date counts as your filing date, and certification creates legal proof that you mailed the document when you say you did.6Office of the Law Revision Counsel. 26 U.S. Code 7502 – Timely Mailing Treated as Timely Filing and Paying
If the Notice Says You Owe Money
A balance-due notice (often a CP14, followed by a CP503 reminder if you don’t respond) doesn’t require you to pay the entire amount at once.7Internal Revenue Service. Understanding Your CP14 Notice8Internal Revenue Service. Understanding Your CP503 Notice The IRS offers several payment options you can set up online.
- A short-term payment plan lets you pay within 180 days at no setup cost. Penalties and interest keep accruing until the balance is cleared.9Internal Revenue Service. Payment Plans; Installment Agreements
- A long-term installment agreement with direct debit is available if you owe $50,000 or less in combined tax, penalties, and interest and have filed all required returns. The online setup fee is $22, waived for low-income taxpayers.9Internal Revenue Service. Payment Plans; Installment Agreements
- A standard installment agreement without direct debit has a $69 online setup fee, or $178 if you apply by phone, mail, or in person.9Internal Revenue Service. Payment Plans; Installment Agreements
Doing nothing is the costliest option. The failure-to-pay penalty is 0.5% of the unpaid tax for each month or partial month the balance remains outstanding, on top of interest.10Internal Revenue Service. Failure to Pay Penalty A payment plan won’t erase penalties, but it keeps the account from moving into collections.
If You Disagree With the Notice
Follow the dispute instructions printed on the notice, include copies of documents that support your position, and reply by the stated due date to preserve your appeal rights.3Internal Revenue Service. Understanding Your IRS Notice or Letter Mail photocopies, not originals.
For audit-related disputes, the IRS typically gives 30 days to request a conference with the IRS Independent Office of Appeals. Miss that window and the IRS may disallow the items and issue a statutory notice of deficiency.11Taxpayer Advocate Service. Letter 525 Audit Report/Letter Giving Taxpayer 30 Days to Respond
Identity Verification Notices
If your notice is from the CP5071 series, the IRS flagged a return filed under your Social Security number as potentially suspicious and needs you to verify your identity before it will finish processing the return. You can verify online at irs.gov/verifyreturn or by phone using the number on the letter.12Internal Revenue Service. Understanding Your CP5071 Series Notice Nothing moves forward until you respond, so this is one to handle promptly even though it isn’t a bill.
The 90-Day Letter: Don’t Let This One Sit
A statutory notice of deficiency — commonly labeled CP3219N or Letter 3219 — is the most important piece of mail the IRS will ever send you. You have exactly 90 days from the date on the notice (150 days if you’re outside the United States) to file a petition with the U.S. Tax Court.13Internal Revenue Service. Understanding Your CP3219N Notice That deadline is set by law and the IRS cannot extend it.14Taxpayer Advocate Service. 90-Day Notice of Deficiency
Filing the petition lets you challenge the proposed tax without paying it first. If the 90 days expire without a petition, the IRS assesses the additional tax, bills you, and starts collection. Your only remaining way to contest the amount at that point is to pay it in full and sue for a refund.14Taxpayer Advocate Service. 90-Day Notice of Deficiency
If a 90-day letter is in your mailbox, consider calling a tax professional — an enrolled agent or a CPA who handles IRS notice resolution — early rather than late. The clock does not pause while you’re looking for help.