A letter arrives with official letterhead, a case number, and a clear threat: pay now or face legal consequences. Hearts race, and the first reaction of many business owners is to respond immediately, call the number on the letter, or transfer money to "fix it quickly." That's exactly the result a fake IRS or FinCEN letter aims for: to make you act before you think. The good news is that verifying whether a letter is real takes less than ten minutes if you know what to look for.
What a real IRS letter looks like
All legitimate IRS correspondence contains specific elements that scams rarely replicate in their entirety. A real letter always includes a notice or letter number (in the format CP followed by numbers, such as CP2000, or LTR followed by numbers), your correct and full name, a specific IRS service center address you can write to, and a clearly identified tax period. If the letter you have doesn't have a recognizable notice number, or the name is misspelled, or it simply asks to "verify your information" without specifying what that verification entails, that's a red flag.
Another important detail: the IRS never asks for gift cards, instant payment app transfers, or cryptocurrencies as payment. None. If the letter or accompanying call mentions any of these options, you know it's not from the IRS.
The IRS never does this
There are behaviors that immediately rule out the authenticity of a contact claiming to be from the IRS:
Do not use email, text, or social media for tax matters. The IRS sends official correspondence by mail (USPS). If you received an email or text message demanding payment or "urgent verification" of your tax account, it is a scam, without exception.
It doesn't leave threatening voicemails. The IRS doesn't call demanding immediate payment, nor does it threaten arrest, deportation, or license suspension in a voicemail. That kind of pressure and artificial urgency is the hallmark of phone scams.
It doesn't require you to call the number on the letter or suspicious mail itself. Scammers print fake phone numbers that they answer themselves, impersonating IRS agents to reinforce the lie. The rule is simple: never call the number on the suspicious letter; look up the official number directly on IRS.gov.
How to verify a letter that claims to be from FinCEN
FinCEN (the Financial Crimes Enforcement Network of the Treasury Department) became a common target of scams after the wave of fraudulent correspondence regarding beneficial ownership (BOI) reports. The same verification principles apply: FinCEN has no offices outside the United States , does not request "clean funds reports," does not place "automatic stop orders" on any business's money, and does not charge fees for filing reports. If a letter or email claiming to be from FinCEN includes any of these elements, it is fraudulent.
To verify any communication claiming to be from FinCEN, contact them directly through fincen.gov/contact , never replying to the original sender or calling the number on the suspicious letter.
The 3 steps to confirm before answering
Before paying, calling, or clicking on any link in a letter or mail claiming to be from the IRS or FinCEN, follow this process:
1. Check your official IRS.gov account. Every legitimate notice the IRS sends you is displayed when you log in to your IRS.gov account. If the notice isn't there, you have good reason to be suspicious.
2. Look up the notice number on the official IRS website. The IRS maintains a public list of the most common notice (CP) and letter (LTR) numbers with their exact meanings. If the number on your letter doesn't match any actual notice, or the format doesn't match, it's a clear red flag.
3. Only call an official number that you find yourself. Never dial the number printed on the suspicious letter. Look up the correct contact number directly on IRS.gov or fincen.gov and confirm it there.
What to do if you've already responded or paid
If you've already given personal information, made a payment, or shared business details with someone who turned out to be a scammer, act immediately: contact your bank or card issuer to try to stop or reverse the charge, change the passwords for any accounts you mentioned during the contact, and document everything you remember from the communication (phone number, email, date, and amount). The faster you act, the better your chances of limiting the damage.
Where to report a suspicious letter or call
In 2026, the IRS launched a centralized reporting tool at IRS.gov/SubmitATip where you can submit details of any suspicious letters, mail, or calls claiming to be from the IRS. If the attempt impersonates FinCEN, report it to the Treasury Office of Inspector General (TIGTA) and the Federal Trade Commission (FTC) at ReportFraud.ftc.gov. Reporting not only protects you but also helps authorities identify patterns and warn other businesses before they fall for the same scam.
Why business owners are a frequent target
Scammers know that a business owner handles more tax-related paperwork than the average employee: payroll, withholding forms, entity reports, LLC renewals. This complexity makes a fake letter mentioning "a pending form" or "a correction to your return" sound credible. The more familiar you are with actual IRS processes—what notices exist, what they look like, when they arrive—the easier it is to spot when something doesn't add up.
FAQ
Does the IRS ever call without first notifying you by mail?
In very specific cases (such as visits from a compliance officer), there may be telephone or in-person contact, but almost always after several notices have been sent by mail. An initial contact made exclusively by phone demanding immediate payment is the most common red flag of a scam.
How do I know if the notice number (CP or LTR) on my letter is real?
You can look up the exact number on the IRS website, where each notice explains what it means. If you don't find a match, or the explanation doesn't apply to your situation, be suspicious.
Does FINCEN still require the reporting of beneficial owners (BOI)?
The rules have changed several times; it's advisable to check the current status directly at fincen.gov/boi before assuming that any letter on the subject is automatically a real obligation.
What do I do if the scammer already has my EIN or legal business name?
This information is usually public (you can get it from your LLC or corporation's state registry), so it doesn't, on its own, confirm that the person contacting you is legitimate. Follow the same verification process regardless of how well-informed the sender seems.
Don't let urgency decide for you
Scams impersonating the IRS or FinCEN rely on one thing: making you act fearfully before verifying. Taking ten minutes to confirm a notice with the official source is almost always all it takes to protect you and your business.
Request your free quote here if you would like us to review any pending notices or forms for your business together.
Fuente: IRS — Tax scams and consumer alerts.
Also read: BOI scam: how to recognize fake FinCEN letters · Form 966: how to close your corporation step by step · What is the IRS CAF file and why is your accountant waiting for it · How long to keep paperwork when closing your business · How to pay my business taxes.
