National Insurance Scam Call UK: HMRC Impersonation Guide 2024
HMRC will never ring you out of the blue about National Insurance fraud or arrears.
What is this scam?
The National Insurance scam call is a social engineering attack where criminals impersonate HMRC (Her Majesty's Revenue and Customs) to frighten you into disclosing personal information or sending money. The caller claims you owe back taxes, have made fraudulent National Insurance contributions, or face immediate arrest unless you act now. Some variants threaten to freeze your benefits, cancel your passport, or flag you for prosecution. The scammer creates urgency and panic to override your common sense. They may ask you to verify identity details, confirm banking information, or install remote access software on your device. This is a UK-specific scam targeting millions of residents annually. HMRC never initiates contact this way—they always use formal written mail. The goal is identity theft, financial fraud, or direct money theft through wire transfer or gift cards.
Warning signs to look for
- The caller claims you owe unpaid taxes or National Insurance contributions and must pay immediately to avoid arrest or legal action.
- You receive an unexpected call claiming to be from HMRC—genuine HMRC always writes to you first via post.
- The caller requests personal information like your National Insurance number, bank details, or passport number over the phone.
- Threats of prosecution, benefit suspension, or passport cancellation are mentioned—real HMRC doesn't threaten via phone calls.
- The caller asks you to stay on the line while you transfer money or visit a bank or shop to buy gift cards.
- A sense of extreme urgency: 'Act now or face serious consequences'—legitimate organisations allow time for considered action.
- The number displayed on your phone looks like it could be HMRC (perhaps starting with 020 or 0300), but HMRC's main numbers are publicly listed and different.
- Background noise of a busy office or call centre—many scammers use boiler room tactics to sound official.
How this scam works step by step
The scam typically begins with an unsolicited inbound call. The scammer uses caller ID spoofing to make their number appear as if it's from HMRC or a government agency. They greet you professionally and claim to be calling from 'HMRC Fraud Department' or 'Tax Compliance Team'. They then allege you have unpaid National Insurance contributions, fraudulent claims on your record, or owe back tax. The caller creates panic by mentioning potential arrest, prosecution, or benefit suspension. To 'resolve' the issue immediately, they ask you to confirm personal information: your National Insurance number, date of birth, address, bank details, or passport information. If you comply, the scammer now has identity data for further fraud. Some variants escalate to asking you to transfer money directly to a 'settlement account', visit your bank immediately, or purchase iTunes or Google Play cards to pay the 'fine'. Throughout the call, the scammer maintains control by keeping you on the line, preventing you from independently verifying their identity. If you hang up and call HMRC back, the scammer may remain on the line using a technique called 'call holding', making you believe you're speaking to HMRC when you're still connected to them.
How to verify if it is genuine
Never rely on the phone number shown on your caller ID—scammers spoof numbers routinely. If you're concerned about a tax or National Insurance issue, hang up immediately and call HMRC directly using the number on the official HMRC website (gov.uk/hmrc) or on a genuine tax letter you previously received. HMRC's main helpline is 0300 200 3300. Do not use any phone number the caller provides. Wait at least five minutes before calling back to ensure the line has disconnected—stay alert for the call-holding trick mentioned above. Check your official HMRC online account (if registered) to see if there are any genuine compliance notices. Genuine HMRC contact arrives by post and includes your name, address, National Insurance number, and specific details about what is allegedly owed. You'll receive a formal letter with reference numbers, payment deadlines, and appeal procedures. Real HMRC will never demand immediate payment by bank transfer, gift card, or cash, and will never threaten arrest via an unexpected phone call. If unsure about a letter, call HMRC's verified number to confirm. Use this guide on spotting official communications to help distinguish genuine from fake.
What to do if you have already interacted
If you've spoken to the scammer but haven't sent money or shared sensitive information, you've been lucky—simply hang up, block the number, and report it immediately. If you've already given your National Insurance number or date of birth, there is less immediate risk, but monitor your credit file and bank statements closely for fraudulent activity. If you've authorised a bank transfer or payment, contact your bank immediately and ask them to recall the payment or block the recipient account. Most UK banks can reverse transfers within hours if reported quickly. If money has already left your account, file a report with your bank's fraud team and Action Fraud simultaneously. If you've installed remote access software or given remote access to your device, disconnect from the internet immediately, change all passwords (from a different device if possible), and run a full antivirus scan. Consider consulting a cyber security specialist if you're unsure. Do not attempt to contact the scammer again. Report the scam to Action Fraud (see below) as soon as possible—the faster you report, the better your chances of recovery and helping prevent others from being targeted.
Reporting this scam in the UK
Report this scam to Action Fraud, the UK's official fraud reporting service, by calling 0300 123 2040 (Monday to Friday, 8am to 8pm) or visiting actionfraud.police.uk online. Have ready: the date and time of the call, the number that appeared on your phone, what you were told, and any reference numbers mentioned. If you received a voicemail or text message related to the scam, save it as evidence. If you've been asked to visit a shop or bank to send money, tell the bank staff immediately—many are trained to spot this scam and will block the transaction. Report the phone number to Ofcom (the communications regulator) via their website or by calling 020 7981 3000. If you suspect your data has been compromised, report it to the Information Commissioner's Office (ICO) at ico.org.uk. Forward any related emails or text messages to the NCSC's Suspicious Email Reporting Service at report@phishing.gov.uk. SMS messages claiming to be from HMRC should be forwarded to 7726 (spells SPAM). Also report to Citizens Advice's consumer helpline on 0808 223 1133 if you need additional support or advice on next steps. The more people who report this scam, the better intelligence law enforcement has to catch the perpetrators.
Frequently asked questions
Is HMRC ever a scammer, or is it always a legitimate organisation?
HMRC itself is a legitimate UK government organisation and will never scam you. However, criminals impersonate HMRC by spoofing phone numbers and using official-sounding titles. The key rule: HMRC always contacts you by formal written post, never by unexpected phone calls. If someone rings claiming to be HMRC about a tax or National Insurance problem, it is a scam. Hang up, use the official HMRC number from gov.uk to call them back, and verify the issue independently.
What should I do if I've already sent money to the scammer?
Contact your bank immediately and ask them to recall the payment or block the recipient account—this works best if you report within hours. If the money has been sent to another bank, both banks can work together to try to recover it. File a report with Action Fraud (0300 123 2040) and provide your bank with the Action Fraud reference number. Keep all evidence of the call and payment. Some payments, especially bank transfers between UK accounts, can be recovered within days if reported quickly. Do not contact the scammer again or attempt to negotiate recovery.
Can the scammer keep me on the line and make me think I'm calling HMRC back when I'm not?
Yes, this is called 'call holding' and is a known tactic in this scam. If you ask to hang up and call HMRC back independently, the scammer may pretend to hang up but keep the line open. When you dial HMRC's number, you're actually still connected to the scammer's office, and they answer as if they're HMRC. To prevent this, wait at least five minutes after the initial call ends before calling HMRC back. Hang up, count to 300, disconnect from the line completely, and then dial HMRC's number from the official gov.uk website. This ensures you have genuinely disconnected and are calling the real HMRC.
How do I report this scam?
Report to Action Fraud by calling 0300 123 2040 (Monday to Friday, 8am to 8pm) or visiting actionfraud.police.uk. Also forward any related SMS messages to 7726 (SPAM), report emails to the NCSC at report@phishing.gov.uk, and report the phone number to Ofcom. If you need additional support, call Citizens Advice's consumer helpline on 0808 223 1133. Always have the date, time, and number that called you ready when reporting.