Introduction: Why a Purchased Life Annuity Splits Two Different Ways
A purchased life annuity looks like one of the safest decisions in British retirement planning. Furthermore, the tax treatment appears generous, because Britain exempts most of each payment. However, America applies an entirely separate set of rules to the identical cash.
Both countries divide your purchased life annuity payment into capital and income. Nevertheless, they divide it using different mechanics and, critically, on different timetables. Consequently, an arrangement that looks efficient in Britain can become expensive in America roughly two decades in.
We see this repeatedly among American clients who take a British pension lump sum and convert it into guaranteed income. Notably, the problem never appears in year one. Instead, it arrives quietly, long after the decision becomes irreversible.
What a Purchased Life Annuity Actually Is
A purchased life annuity is a contract you buy voluntarily with your own capital. You hand an insurer a lump sum, and the insurer pays you a stated amount periodically for life. The governing rules sit in Chapter 7 of Part 6 of ITTOIA 2005.
Crucially, the money must already sit outside a pension wrapper. Therefore, the classic route runs in two steps. Firstly, you take your 25% pension commencement lump sum. Secondly, you use that released capital to buy the annuity.
The Distinction That Decides Everything
Buying an annuity directly with pension funds produces a compulsory purchase annuity instead. That product carries no capital element whatsoever, because every payment counts as pension income. Accordingly, the whole payment falls into British income tax.
The distinction matters enormously and clients frequently miss it. Specifically, only capital that has genuinely left the pension can produce a purchased life annuity. Otherwise, the partial exemption scheme simply does not apply.
How Britain Taxes the Capital Element
Britain treats part of each payment as a return of your own money. That portion carries no income tax at all. Meanwhile, the balance counts as savings income and suffers tax in the ordinary way.
Basic rate tax normally comes off at source. However, the insurer needs the correct paperwork before applying the exemption.
The Exempt Proportion Formula
The exempt proportion divides your purchase price by the actuarial value of the annuity. In practice, the calculation uses prescribed mortality tables and your age in whole years at the first payment date. Additionally, no discount applies for the time value of money.
Once fixed at outset, the exempt proportion never changes. Therefore, the same percentage of every payment stays tax-free for as long as you live. This permanence becomes the heart of the American problem discussed below.
The mechanics sit in the Income Tax (Purchased Life Annuities) Regulations 2008. Furthermore, HMRC's Insurance Policyholder Taxation Manual sets out the partial exemption scheme in detail.
Forms PLA6 and R89
Your insurer cannot apply the exemption without HMRC form PLA6. This form establishes the capital element of your purchased life annuity. Consequently, failing to submit it means the whole payment suffers tax.
HMRC explains the consequences where an annuitant fails to return form PLA6. Separately, form R89 lets you receive payments gross where your income sits below the personal allowance. For our clients, that second form rarely applies.
How America Taxes the Same Payment Under Section 72
America ignores the British split entirely. Instead, section 72 of the Internal Revenue Code applies its own exclusion ratio to your purchased life annuity. The statutory rules at 26 USC 72 govern the calculation.
The IRS confirms this approach for foreign contracts in its guidance on the taxation of foreign pension and annuity distributions. Therefore, a British product receives no special American treatment.
The Exclusion Ratio
Your exclusion ratio divides the investment in the contract by the expected return. The regulation at 26 CFR 1.72-4 sets out the mechanics precisely. Additionally, IRS Publication 939 supplies the American mortality tables.
Expected return multiplies your annual payment by your life expectancy under those tables. Consequently, the American and British percentages start out broadly similar, because both rest on life expectancy. Many advisers stop there and conclude the two systems align.
Why the Two Splits Never Stay Aligned
They align only at the beginning. Section 72(b)(2) caps the total amount you may exclude at your investment in the contract. Therefore, once you have recovered your original capital, the American exclusion stops completely.
From that moment, America taxes one hundred per cent of every payment. Meanwhile, Britain continues exempting the same fixed proportion indefinitely, because the British exempt proportion carries no such cap. Consequently, the two systems diverge permanently at a predictable date.
Currency adds a second divergence. America fixes your investment in the contract in dollars at purchase, while each payment translates at current rates. Hence, a weaker pound can shrink your dollar recovery without changing anything you actually receive.
The Treaty Promise the Savings Clause Takes Away
Reading the treaty offers false comfort. Article 17(4) appears to solve the problem outright. Unfortunately, another article quietly removes the benefit for American citizens.
Article 17(4) and the Annuity Definition
The US-UK income tax treaty states that an annuity beneficially owned by a resident of a Contracting State is taxable only in that State. Furthermore, it defines an annuity as a stated sum paid periodically under an obligation to make payments in return for adequate and full consideration.
A purchased life annuity fits that definition precisely. You paid full consideration, and the insurer owes you stated periodic sums. Therefore, on a plain reading, Britain alone should tax the income.
Why Article 1(5) Leaves You Exposed
Article 1(4) contains the savings clause, letting America tax its citizens as though the treaty never existed. Article 1(5) then lists the specific benefits the savings clause cannot touch. That list covers Article 17(1)(b), 17(3) and 17(5), together with Article 18(1) and Articles 24 to 26.
Article 17(4) appears nowhere on that list. Consequently, the savings clause applies in full, and America taxes your purchased life annuity regardless of the treaty. This single omission drives every difficulty in this article.
The same analysis affects your pension lump sum. Article 17(2) also sits outside the protected list, so America taxes the 25% payment Britain treats as tax-free. Accordingly, the trouble often begins before the annuity even exists.
The Stranded Credit Problem
Relief from double taxation normally arrives through the foreign tax credit. However, a credit requires foreign tax to have been paid. Where Britain charges nothing, nothing exists to credit.
No British Tax Means No Credit
Britain exempts the capital element entirely. Therefore, that slice of your purchased life annuity generates no British tax whatsoever. In the early years this rarely hurts, because America excludes a similar slice.
After the exhaustion point, the position reverses sharply. America taxes the entire payment, while Britain still taxes only the small interest element. Consequently, your American liability jumps precisely when your available credit stays flat.
The IRS foreign tax credit rules offer no remedy here. Furthermore, excess credits from other income sit in different baskets and frequently cannot help. Ultimately, you face genuine double taxation on a product marketed for its security.
Planning Around the Exhaustion Point
You can model the exhaustion date of a purchased life annuity before you buy. Specifically, divide your purchase price by the annual excluded amount to find the year your American exclusion ends. Therefore, the risk is entirely quantifiable in advance.
Shorter fixed-term annuities reach exhaustion differently from lifetime contracts. Additionally, splitting capital across purchase dates staggers the effect rather than concentrating it. Our cross-border planning team models these outcomes before clients commit capital.
The 1% Excise Tax on Premiums Paid to a UK Insurer
American law imposes an excise tax on premiums paid to foreign insurers. Most annuitants have never heard of it. Nevertheless, it applies by default to a purchased life annuity bought from a British provider.
Section 4371 and Form 720
Section 4371 of the Internal Revenue Code imposes a 1% excise tax on annuity contract premiums paid to a foreign insurer. You report and pay it on Form 720. Consequently, a £250,000 purchase price carries a headline charge of £2,500.
The Treaty Exemption Under Article 2
Fortunately, the treaty covers this tax explicitly. Article 2(3)(a)(ii) lists the federal excise taxes imposed on insurance policies issued by foreign insurers among the taxes to which the Convention applies. Therefore, premiums paid to a qualifying British insurer can escape the charge.
The exemption depends on the insurer's position and on anti-conduit rules. Importantly, some insurers hold closing agreements with the IRS covering exactly this point. Accordingly, you should confirm the position in writing before paying the premium rather than afterwards.
Reporting: FBAR, Form 8938 and the Cash Value Question
Reporting turns on whether your purchased life annuity carries a cash surrender value. A deferred annuity with surrender value counts as a foreign financial account for FBAR purposes. Therefore, you report it once your combined foreign accounts exceed $10,000.
An immediate purchased life annuity in payment usually carries no surrender value at all. Consequently, many such contracts fall outside FBAR reporting entirely. However, the answer depends on your policy wording, so you should check rather than assume.
Form 8938 follows separate thresholds under the FATCA reporting rules. Additionally, the capital sitting in your bank account between the lump sum and the purchase is plainly reportable. Our FBAR and FATCA specialists handle both filings for clients making this transition.
A Worked Purchased Life Annuity Case Study
Consider an American citizen aged 67, resident in London, holding a £1,000,000 self-invested pension. They take the 25% lump sum of £250,000, which Britain exempts and America taxes. Subsequently, they buy a purchased life annuity with the full £250,000.
The insurer offers £16,000 a year for life. British prescribed tables give a life expectancy of roughly 19 years, producing an actuarial value near £304,000. All sterling conversions below use an illustrative rate of £1 to $1.32.
The First Nineteen Years
The exempt proportion comes to approximately 82%, so Britain exempts about £13,150 of each payment. Therefore, only £2,850 suffers British tax, costing roughly £1,140 annually at the 40% rate. Meanwhile, America applies a similar exclusion ratio and taxes a comparable amount.
During this period the arrangement works well. Furthermore, the modest British tax generally covers the modest American liability through the credit. Clients understandably conclude that everything is fine.
What Changes at the Exhaustion Point
Around year twenty, the annuitant has recovered the full £250,000 investment. Consequently, section 72(b)(2) shuts the American exclusion down completely. From that year forward, the entire £16,000 becomes taxable ordinary income in America.
Britain, however, changes nothing. The exempt proportion remains fixed, so British tax stays at roughly £1,140. Meanwhile, American tax on £16,000 at a 24% marginal rate reaches about £3,840, or roughly $5,070.
The credit covers only the £1,140 actually paid to Britain. Therefore, an unrelieved American liability of roughly £2,700 arises every year thereafter, on income Britain still regards as largely a return of capital. Over a further fifteen years, that gap exceeds £40,000 in today's money.
How TaxYork Can Help
TaxYork advises American citizens and dual nationals across the full retirement transition in Britain. Furthermore, we model the American consequences before capital moves, rather than reporting them afterwards.
We calculate the exhaustion date, quantify the credit shortfall, and compare alternatives against a purchased life annuity on a genuine after-tax basis. Additionally, we prepare both filings, and our US tax return preparation service covers the Form 1116 and section 72 reporting each year.
Clients frequently arrive with earlier years already filed incorrectly, particularly where the pension lump sum went unreported. In those cases, we assess the catch-up route and correct the historic position. Guidance from the ICAEW tax faculty and the Chartered Institute of Taxation informs our approach throughout.
Conclusion
A purchased life annuity delivers exactly what Britain promises. Nevertheless, America never signed up to the British bargain. Therefore, the product performs differently depending on which passport you hold.
Three points deserve your attention. Firstly, the British exempt proportion runs forever while the American exclusion stops once you recover your capital. Secondly, Article 17(4) sits outside the savings clause protections in Article 1(5), so the treaty provides no shelter. Thirdly, the resulting American tax arrives with almost no British tax available to credit against it.
None of this makes the product wrong. However, it does make the decision one you should model rather than assume. General background sits at MoneyHelper and Investopedia, while current British rates appear at GOV.UK. Ultimately, running the numbers across both systems before you commit remains the only reliable protection.
Contact Us
Speak to a specialist before you convert a pension lump sum into guaranteed income. You can book a consultation to model the position across both tax systems.
Email hello@taxyork.com or telephone 020 3488 8606. Furthermore, we review existing annuity contracts for clients who have already purchased.
Disclaimer
This article provides general information only and does not constitute tax advice for any specific person or situation. Tax legislation, rates, thresholds and mortality tables change, and their application depends entirely on individual circumstances. Figures quoted reflect the 2026/27 British tax year and the 2026 American tax year, and all sterling conversions in the case study are illustrative rather than actual. You should obtain professional advice before purchasing any annuity or acting on anything contained here. TaxYork accepts no liability for any loss arising from reliance on this article.