UK investment bonds and the IRS: the wrapper that costs Americans the most

Figures relate to tax year 2025-26 (UK) / 2025 (US)

A UK adviser offers you a neat solution. Investment bonds, they explain, let you take 5% a year with no immediate tax and defer the rest for decades. In Britain that is broadly true. For an American they rank among the costliest products available.

The IRS does not recognise the deferral, and the wrapper can trigger several reporting regimes at once. So this guide covers what these policies do to a US return, the excise tax people miss, and how to exit without making things worse.

Key takeaways

• Growth inside investment bonds is often taxable each year in America, whatever Britain defers.
• Funds inside the policy can bring PFIC reporting on top.
• A 1% federal excise tax can apply to premiums paid to a foreign insurer.
• The policy counts as a foreign financial account for FBAR purposes.
• Surrendering needs planning, because both countries tax the exit differently.

What is a UK investment bond?

It is a single premium life assurance policy used as an investment wrapper. You pay in a lump sum, the insurer invests it, and the policy grows. British tax law lets you withdraw 5% of the premium each year without an immediate charge.

Tax arrives at the end, on what Britain calls a chargeable event. Top-slicing relief can then spread the gain across the years you held it. Onshore versions carry an internal credit, while offshore versions roll up gross.

Britain taxes the wrapper at the end. America taxes what is inside it, every year, from the start.

Why does the IRS treat them so harshly?

Because most of these policies fail the American definition of life insurance. US law sets technical tests for how much insurance a policy must carry relative to its investment. British investment bonds serve as investments, carrying only nominal cover.

When a policy fails those tests, the growth inside it becomes taxable to you each year. The British deferral disappears entirely. You pay US tax on income you have not received, in a year when Britain charges nothing.

Some policies do qualify, and a few target American holders specifically. Those are rare, and the paperwork usually says so plainly.

Do the funds inside count as PFICs?

Often, yes. Where the policy fails the insurance tests, the IRS can look through the wrapper to the underlying holdings. Those holdings are usually UK or offshore funds, which the American rules treat as passive foreign investment companies.

Per the IRS guidance on Form 8621 (opens in a new tab), each fund needs its own form each year. A portfolio bond holding twenty funds can therefore produce twenty forms. Our guide to the ISA and PFIC problem explains why that regime costs so much.

The combination is what hurts. Annual income on the inside build-up, PFIC treatment on the funds, and no British tax to credit against either.

How do onshore and offshore versions differ?

In Britain, quite a lot. An onshore bond pays tax inside the fund, which counts as a basic-rate credit when the gain arises. An offshore bond rolls up gross, so the whole gain meets tax at the end.

For an American the distinction barely matters. Both types of investment bonds usually fail the US insurance tests, and both hold funds that bring their own reporting.

Offshore versions are slightly worse. The untaxed roll-up leaves no British tax to credit at any point, so the US charge stands alone.

What is the 1% excise tax?

It is a federal charge on premiums paid to foreign insurers. The rate is 1% of the premium for life insurance and annuity contracts, reported on Form 720. Per the IRS guidance on Form 720 (opens in a new tab), you file the return quarterly rather than annually.

Treaty relief may be available where the insurer qualifies, so the charge does not always apply. The point is that nobody usually checks. Most holders have never heard of the form.

The amounts are small next to the income tax. The missed filings are the problem, because an unfiled return leaves the year open far longer than it should be.

Does the 5% rule mean anything in America?

No. The 5% allowance is purely British. America looks through to the growth inside the policy, so a withdrawal within that allowance changes nothing on your US return. You can owe US tax in a year when you took nothing out at all.

That mismatch confuses people most. The money stays invested, the British tax waits, and the American tax arrives anyway. Ask your provider for the figures each year, whatever Britain requires of you.

Does the policy need reporting?

Yes, in at least two places. A policy with a cash value counts as a foreign financial account, so it belongs on your FBAR once your accounts pass $10,000 in total. Per the FinCEN guidance on foreign accounts (opens in a new tab), you report the maximum value during the year.

Form 8938 applies above its own higher thresholds. Our guide to Form 8938 and the other international forms sets out which ones your holdings trigger.

Some structures raise foreign trust questions as well. That depends on the policy wording, so the documents matter more than the marketing brochure.

How do you deal with one you already hold?

Slowly and deliberately, because a rushed surrender can cost more than another year of holding. Both countries tax the exit, and they tax it differently. Work through this order before doing anything: Investment bonds rarely reward haste.

1. Get the policy documents and check whether it meets the US insurance tests.
2. List every fund held inside the policy, with purchase dates.
3. Establish what has already been reported on past US returns.
4. Model the UK chargeable event gain, including top-slicing relief.
5. Model the US cost of surrendering in a single year.
6. Compare a full surrender against staged withdrawals across tax years.
7. Check the excise tax position on premiums already paid.

Timing around a move matters most of all. Surrendering while still outside the US system, or after leaving it, can remove the American side of the problem entirely.

What about a policy bought before you became American?

The US treatment starts when you do. Income arising after you become a US taxpayer is taxable, even where the policy began years earlier. The history matters for the numbers, not for whether the rules apply at all.

Green card holders and new arrivals are caught most often, since the policy predates any American advice. Investment bonds bought before a move to America deserve review before the move, not after it.

Selling first is usually cheaper. The British gain then arises while you sit outside the US system, which removes the American charge on it entirely.

A worked example

Take an illustrative example. An American in Surrey bought an offshore policy holding fifteen funds, with a £200,000 premium paid eight years ago. She has taken 5% each year and reported nothing in America.

Her US position differs sharply from the sales pitch. The growth was taxable each year, each fund carried its own reporting, and the premium may have attracted excise tax. None of that appeared on her returns.

The fix takes two steps. First, a catch-up route for the past years. Then a planned exit, timed so the chargeable event and the American tax fall where they cost least.

The paperwork you will need

Ask the provider for the policy schedule, the fund list, and an annual statement showing the value at each year end. Those three documents answer most questions.

You also need the premium history with dates. That drives both the excise tax question and the UK chargeable event calculation when you exit.

Older policies are the hardest. Providers merge, records move, and some documents take weeks to arrive. Request everything early rather than at the point of sale.

What should you hold instead?

Almost anything simpler than investment bonds. Simplicity wins for Americans in Britain. Directly held shares, US-domiciled funds and cash all behave predictably in both systems. A workplace pension keeps its treaty protection, which no insurance wrapper matches.

Our guide to the Lifetime ISA and US tax covers another British wrapper where the version you choose decides the cost. The same principle applies here: the product is rarely the problem, the funds inside it usually are.

Why do advisers keep selling them?

Because they work well for most British clients. The deferral works, the administration stays light, and the product suits higher-rate taxpayers planning around retirement. None of that changes when the client happens to be American.

Few UK advisers study US tax, and nothing in the product literature warns about it. So the conversation rarely happens until a US preparer sees the policy years later. So investment bonds keep reaching American clients who should never hold them.

Mistakes and traps with investment bonds

Each of these appears regularly, and each is expensive to unwind:

• Assuming the British deferral applies to the US return.
• Treating 5% withdrawals as tax-free in both countries.
• Missing PFIC reporting on the funds inside the wrapper.
• Never filing Form 720 for the premium excise tax.
• Surrendering in one year without modelling the US cost first.
• Buying a policy while planning a move to America.

Anyone about to move to the United States should review these policies first. Selling before arrival is usually far cheaper than holding through the move.

How US UK Tax Accountants helps

We read the policy documents, test them against the US rules, and price each exit route before you act. Our PFIC reporting service covers the funds inside the wrapper, including Form 8621 preparation.

In our practice these cases reward patience. We agree a fixed fee in writing before any work begins, and we set out the catch-up position before touching the policy.

Review the policy before you act

If you hold a British or offshore policy, a short review shows what it costs you in America and what an exit would involve. Send us the policy schedule and your latest statement. You can book a consultation and hear back within one working day.

Last reviewed 16 September 2026 by the US UK Tax Accountants Tax Team. This article is general information, not personal tax advice — speak to a qualified US/UK tax adviser about your own position.