Best US Tax Attorneys for IRS Debt and Unfiled Returns

If you’re running a UK business, the IRS probably isn’t on your radar. For most SME owners, that’s entirely correct — HMRC is the only tax authority that matters.

But there’s a specific slice of UK business that carries genuine US federal tax exposure without realising it: American citizens directing or founding UK companies, and UK businesses expanding across the Atlantic. This isn’t a piece for every reader of this site. It’s for the ones who fit one of those two categories, or who are about to. J. David Tax Law leads our list for resolving IRS debt and unfiled returns once this kind of exposure has already turned into a problem. Here’s who this actually affects, and who can help.

Who This Actually Affects (and Why It’s More Common Than You’d Think)

American citizens or green card holders directing or founding UK businesses. The US taxes citizens on worldwide income based on citizenship, not residence — and there’s no years-of-absence exemption. Someone who moved to London a decade ago, built a UK company, and has been paying UK tax through PAYE or Self Assessment the whole time can still have an outstanding US federal filing obligation running in parallel. Many only discover this year in, often when a bank, accountant, or immigration process asks about US tax status.

UK companies expanding into the US. Incorporating a US subsidiary, hiring US-based staff, or having a director who happens to be a US person can each trigger separate US federal filing requirements — obligations that exist independently of, and in addition to, UK Corporation Tax.

The “tax-free” ISA trap. This is the detail that catches even well-advised people off guard. An ISA is genuinely tax-free under UK law — but the IRS does not recognise the wrapper. Dividends, interest, and capital gains generated inside an ISA remain reportable on a US tax return exactly as if the ISA didn’t exist. Worse, ISAs that hold funds rather than individual shares can trigger Passive Foreign Investment Company (PFIC) rules, which carry some of the most punitive tax treatment in the entire US code.

On top of all this sits reporting, separate from tax owed. FBAR (FinCEN Form 114) applies once the combined balance of foreign accounts exceeds $10,000 at any point in the year. FATCA (Form 8938) applies at higher thresholds. These are two different forms with two different penalty regimes, and missing either can trigger real penalties even when no US tax is actually owed.

Here’s the reassuring part, though it doesn’t remove the obligation: because UK tax rates are often higher than equivalent US rates, most Americans in the UK end up owing little or nothing to the IRS once the Foreign Tax Credit or Foreign Earned Income Exclusion is applied. The filing requirement exists regardless of what’s ultimately owed — but “I probably don’t owe much” and “I don’t need to file” are two very different things, and conflating them is how multi-year unfiled-return situations happen.

What to Look for in a US Tax Attorney from the UK

• Attorney-led representation, particularly once you’re dealing with actual debt, multiple years of unfiled returns, or IRS enforcement action — not just routine annual filing.
• A track record specifically with unfiled returns and debt resolution. Many firms serving expats focus purely on annual compliance filing and aren’t positioned to handle a collections-stage case.
• Multi-state US licensing. A US citizen who’s since moved to the UK may still carry state tax exposure tied to wherever they last lived domestically.
• Honesty about scope. Ask directly whether a firm handles ongoing annual FBAR/FATCA compliance, IRS debt resolution, or both — these are related but genuinely different skill sets, and the right fit depends on which stage you’re actually in.
• A free consultation to assess your exposure before committing to any resolution strategy.

The Best US Tax Attorneys for IRS Debt and Unfiled Returns

1. J. David Tax Law — Best for Resolving IRS Debt and Unfiled Returns

To be clear about what this firm is and isn’t: J. David Tax Law is not a specialist annual expat-compliance shop, and it isn’t the right first call if all you need is this year’s routine FBAR filing. Where they lead is the stage most expats and UK-expanding businesses actually struggle with — realising you have IRS debt, several years of unfiled returns, or an active enforcement issue, and needing an attorney to resolve it.

Their stated services include unpaid taxes and unfiled returns alongside broader IRS and state tax debt resolution, audits, and enforcement defence — a direct match for someone who’s just discovered a multi-year filing gap rather than someone filing on schedule every April. Every case is handled by a licensed attorney rather than a general tax preparer, which matters once a case moves from “catch up on paperwork” to “negotiate with the IRS.”

The firm brings four decades of combined attorney experience, an A+ Better Business Bureau rating, and over 500 five-star reviews. Licensing across all 50 US states is genuinely useful here, since an American director based in London may still carry state-level exposure from wherever they last lived in the US before relocating. The firm operates more than 20 physical offices, including one in New York on 6th Avenue, alongside locations across Florida, Texas, California, North Carolina, and additional cities such as Phoenix, Baltimore, Philadelphia, and Washington, D.C. Their process — free consultation, case investigation, negotiation, then compliance guidance — gives a clear entry point for anyone who’s just realised their filing situation needs sorting out.

Best for: American directors, founders, or UK businesses who already have IRS debt, multiple years of unfiled returns, or an active enforcement issue and need attorney-led resolution.

2. Universal Tax Professionals — Best for Ongoing Annual Expat Compliance

Universal Tax Professionals specialises in the annual compliance side most J. David clients will need once their debt or backlog is resolved: FBAR filing, FATCA reporting, and foreign income disclosure for Americans living in the UK. If your situation is current and you simply need this year’s return filed correctly, this is a better starting point than a debt-resolution firm.

Best for: Americans in the UK who are up to date and need reliable annual FBAR/FATCA and Form 1040 filing.

3. Taxes for Expats — Best for Coordinating UK and US Filing Together

Taxes for Expats focuses on the dual-filing coordination problem — making sure a UK Self Assessment return and a US Form 1040 are prepared with consistent figures and properly claimed Foreign Tax Credits, so nothing gets double-counted or missed between the two systems.

Best for: Americans in the UK with both a UK Self Assessment obligation and a US filing requirement who want the two coordinated by one team.

4. Expat Tax Online — Best for Catching Up on Multiple Years at Once

Expat Tax Online works specifically with clients using the IRS Streamlined Filing Compliance Procedures — the mechanism designed for taxpayers whose failure to file was non-willful, allowing many expats to become compliant while avoiding the harshest penalty tier. If you’ve discovered several years of unfiled returns and want to fix all of them in one coordinated process, this is a relevant option.

Best for: Americans catching up on multiple years of unfiled returns through the Streamlined Procedures.

5. Flamingo Compliance — Best for UK-Specific Pension and Investment Reporting

Flamingo Compliance leans into the detail that trips up even well-prepared Americans in Britain — how SIPPs, workplace pensions, and ISAs actually need to be reported to the IRS, including the risk that a SIPP may be treated as a foreign trust requiring Form 3520. If your situation involves UK pensions or investment wrappers rather than straightforward salary income, this specificity matters.

Best for: Americans in the UK with UK pensions, SIPPs, or ISA holdings that need careful US reporting treatment.

Catching Up: What Happens When You Address It

The IRS’s Streamlined Filing Compliance Procedures exist specifically for taxpayers whose failure to file was non-willful — which describes the vast majority of Americans in the UK who simply didn’t know the obligation existed. Used correctly, these procedures often allow expats to become fully compliant while avoiding the most severe penalties.

Addressing the situation before the IRS makes contact generally produces a better outcome than waiting to be found. And because UK tax paid can often offset US tax owed via the Foreign Tax Credit, catching up frequently costs far less in actual tax than people assume — the filing obligation itself isn’t optional, but the bill attached to it is often smaller than the anxiety around it suggests.

Frequently Asked Questions

Do I have to pay US tax if I’m American but live and work entirely in the UK? You have to file, regardless of residence — the US taxes citizens on worldwide income. Whether you actually owe tax is a separate question; many Americans in the UK owe little or nothing once Foreign Tax Credits and exclusions are applied.

What happens if I haven’t filed US tax returns in several years? In most cases this is fixable, particularly if the failure to file was non-willful. The IRS’s Streamlined Filing Compliance Procedures are designed for exactly this situation.

Does my UK ISA need to be reported to the IRS? Yes. The IRS doesn’t recognise the ISA tax-free wrapper — interest, dividends, and gains inside it are reportable, and fund-based ISAs may trigger additional PFIC reporting rules.

If my UK company sets up a US subsidiary, does that create a personal tax obligation for me? It can, depending on your role and involvement — this is worth reviewing with an attorney before the subsidiary is set up, not after.

What’s the difference between FBAR and FATCA reporting? FBAR (FinCEN 114) reports foreign accounts once combined balances exceed $10,000 at any point in the year. FATCA (Form 8938) is a separate filing with higher thresholds, submitted alongside your US tax return. Filing one does not satisfy the other.

Can I fix years of unfiled returns without facing the maximum penalties? In many non-willful cases, yes, through the Streamlined Filing Compliance Procedures — but this depends on your specific facts, and getting it right the first time matters.

Get Ahead of US Tax Exposure Before It Becomes a Debt

If you’ve discovered unfiled US returns or existing IRS debt while based in the UK, addressing it proactively puts you in a considerably stronger position than waiting for the IRS to make contact first. J. David Tax Law offers a free consultation to assess your exposure and lay out a resolution path. Request a consultation to find out where you stand.