IRS UK Phone Number: Get Customer Service Fast for Expats

The first major financial development this morning is the IRS marking National Whistleblower Day on July 30, 2026, which directly affects UK expats and investors with US ties. The IRS Whistleblower Office is expanding its collaboration with HMRC, meaning higher scrutiny on undisclosed offshore accounts. At the same time, the IRS is moving to electronic-only payments, including FIRPTA withholding, which could delay property transactions for UK buyers and sellers. This article covers the critical alerts, contact numbers, and step-by-step actions you must take now.

If you are a UK resident with a US filing obligation, understanding the IRS phone number, customer service options, and online account setup is essential to avoid penalties and stay compliant.

1. Why UK Expats Should Pay Attention to IRS Whistleblower Day 2026

On July 30, 2026, the IRS is celebrating National Whistleblower Day to highlight the role of tipsters in exposing tax fraud. According to a report from Accounting Today, the IRS Whistleblower Office is expanding its Whistleblower Alert initiative and now directly helps the UK tax authority’s whistleblower program. For UK expats, this means a higher risk of being reported if you have unreported US income or assets.

The impact is clear: the IRS is actively collaborating with HMRC to share information on tax evasion. If you hold a UK bank account with more than $10,000, it may already be visible to the IRS through FATCA. Most expats ignore Whistleblower risk until they get audited. The best action you can take this week is to review your US tax filings and consider voluntary disclosure if you have undeclared income.

How the IRS Whistleblower Program Already Targets UK Tax Evasion

The IRS Whistleblower Office now works directly with HMRC, according to the same Accounting Today article. This collaboration means that whistleblower tips can cross borders quickly. Imagine a UK expat with unreported US income from a rental property in Florida. A whistleblower—perhaps a former spouse or business partner—can report it and receive 15–30% of the tax recovered. Your decision: voluntarily disclose before someone else does.

If you are a UK expat with complex finances, consider filing amended returns. Delaying voluntary disclosure increases the chance someone else reports you first.

2. IRS Electronic-Only Payments: UK Property Investors Must Prepare Now

The IRS is moving to electronic-only payments for all tax payments, including FIRPTA withholding. According to a report from Anchin (Baker Tilly x Anchin), this change takes full effect in 2026. UK buyers of US property will need to set up an EFTPS (Electronic Federal Tax Payment System) account or use wire transfers. Without this, you risk delayed closings or penalties.

Relying on paper checks in an electronic-only world could delay your property closing by weeks. If you are a UK expat selling a Florida condo, not setting up EFTPS now means you might miss the closing date. The IRS requires that 15% of the sale price be withheld and sent electronically. For a £200,000 property, that’s £30,000 that must be wired. Without EFTPS, the wire can bounce and the sale falls through.

FIRPTA Withholding Made Electronic: What UK Sellers and Buyers Must Do Differently

Under FIRPTA, the buyer must withhold 15% of the sale price for the IRS. Previously, this was done by paper check. Now, the IRS requires electronic payment via EFTPS or wire transfer. Here’s a scenario: John, a UK expat, sells his Florida condo for $400,000. The $60,000 withholding must be sent electronically within 20 days. Without EFTPS, the wire may not be accepted, delaying the transaction.

You must consult a tax professional experienced in cross-border transactions. The following article explains a related risk:

3. How to Contact the IRS from the UK: Phone Number, Customer Service & Online Login

If you are a UK taxpayer with a US filing obligation, reaching the IRS can be tricky. Here is a step-by-step guide for calling the IRS international line and accessing your account online. The irs phone number for international callers is +1-267-941-1000 (not toll-free). Best calling hours are 6:00 AM to 11:00 PM Eastern Time (US), which is 11:00 AM to 4:00 AM GMT. For irs customer service, expect long wait times; use the callback option if available.

Without ID.me verification, you cannot check refunds or make payments online. Start the process now—it takes up to two weeks for verification. The official IRS publications page lists software versions and contact info.

IRS Login & ID.me: What UK Expats Need to Know About Accessing Their Account

To access your IRS login, you must create an id me irs login account. For UK residents, you will need a passport for verification. Common pitfalls include a US address mismatch—if your current address does not match the one on your tax return, verification fails. Keep your US address current in your irs profile (use a family member’s address if you do not have one). Use the irs app (IRS2Go) for checking refunds or making payments.

Step-by-step checklist for setting up your IRS online account from the UK:

• Go to www.irs.gov and click “Sign in”
• Choose ID.me as verification method
• Select passport as ID document (US passport or UK passport accepted)
• Take a selfie for facial recognition
• After verification, link your tax account
• Keep your US address consistent to avoid future lockouts

Many UK expats fail ID.me because their US address on file doesn’t match their current address. A simple mismatch can lock you out for weeks.

4. Key IRS Forms & Publications Every UK Expat Should File in 2026

The IRS updated dozens of forms in June 2026. For UK expats, three are critical: Publication 5216 (FATCA), Publication 5227 (Annual Filing Season Program), and Publication 5411 (Retirement Plans). You can find them on the IRS forms and publications page.

Most expats assume their UK bank won’t report them – but FATCA mandates automatic sharing between HMRC and IRS. Your £50,000 savings account in Lloyds is visible to the IRS.

FATCA Compliance for UK Expats: What the IRS Updated in 2026

FATCA requires UK banks to report account details to HMRC, which shares them with the IRS. The IRS Publication 5216 details the International Compliance Management Model (ICMM) for FATCA. If you have a UK bank account with over $10,000, you must file FBAR (FinCEN Form 114) and Form 8938. Deadline is April 15, with an automatic extension to October 15. Failure to file can trigger penalties of up to $100,000.

For more on cross-border compliance, see:

IRS Annual Filing Season Program: Free Help for UK Taxpayers

The IRS Publication 5227 details the Annual Filing Season Program, which offers free tax preparation for eligible low-income taxpayers. However, the program is designed for simple domestic returns. The free filing program is only for low-income taxpayers and doesn’t cover complex foreign asset situations – most UK expats with rental income or investments will be ineligible. You can find a participating preparer on the IRS publications page (look for Pub 5227). If your income qualifies, use IRS Free File software.

5. Quick Action Checklist: What UK Expats Must Do This Week (July 30 – Aug 5, 2026)

Here is a consolidated checklist of actions from this article. Follow these steps now to stay compliant and avoid penalties.

• Urgent (This Week): Set up your IRS online account via ID.me. Verify your US address to avoid lockouts.
• Urgent: If you are selling US property, set up EFTPS for FIRPTA withholding. Contact a title agent experienced with electronic payments.
• Important (This Month): Review your FATCA compliance. Ensure FBAR and Form 8938 are filed if your UK accounts exceed thresholds.
• Important: Note the Whistleblower risk – if you have undeclared income, consider voluntary disclosure before someone reports you.
• Later (Before Deadlines): Gather all US tax forms and publications (5216, 5227, 5411). Mark April 15, 2027 on your calendar (extended to Oct 15).
• Ongoing: Update your contact information with the IRS to ensure you receive notices. Use the irs app to monitor your account.

What looks small today can become a significant loss in 6 months if you ignore these steps.

Authority Insight Box: A Contrarian View on Whistleblower Programs and UK Expats

While the IRS touts its whistleblower success, a less-discussed risk is the potential for false claims. Whistleblower programs can be misused by disgruntled individuals to file baseless reports, creating compliance anxiety. UK expats should not panic but must ensure their documentation is perfect. This is where most people make their biggest mistake: they assume that if they have done nothing wrong, they have nothing to fear. False claims can still trigger audits and freeze assets temporarily. Keep meticulous records and seek professional advice if you receive any IRS correspondence.

This article is for informational purposes only and does not constitute legal or tax advice. US tax law is complex and subject to change. Readers should verify all details with a certified tax professional experienced in US‑UK cross‑border matters. The author and publisher are not liable for any actions taken based on this content.