Chargeable event gains and top-slicing relief on an offshore bond

What counts as a chargeable event

A policy issued by an insurer in the Isle of Man, Ireland, Luxembourg or another country outside the UK is taxed on a UK resident under the chargeable event rules in ITTOIA 2005 Part 4 Chapter 9. Private placement life insurance gets no regime of its own. The charge falls on you if you are UK resident in the tax year the gain arises and you own the policy, created the trust that holds it, or it is held as security for your debt (s.465).

The events are listed in s.484:

• surrender of all the rights under the policy;
• assignment of all the rights for money or money's worth;
• maturity;
• a death that gives rise to benefits under the policy;
• part surrenders and part assignments that take you beyond the cumulative 5% allowance, known as excess events (s.509);
• the deemed annual gain on a personal portfolio bond (s.525).

Switching between funds inside the policy is not on the list. An assignment by way of gift is not an assignment for money or money's worth, so it is not an event; HMRC's own wording on valuing assignments says the connected-person rule applies “unless there was no consideration so the assignment was not a chargeable event” (IPTM3515). Assignments between spouses or civil partners living together, assignments as security for a loan and the reassignment when the loan is repaid are disregarded, and so is an assignment made under a court order in divorce proceedings (IPTM3420; IPTM3430). The detail on switches and on moving to a new insurer is in switching funds, managers or insurer.

Death is an event only where it gives rise to benefits. On a policy written on several lives that pays out on the last death, the earlier deaths bring nothing and create no gain. A capital redemption policy has no lives assured at all, so it has no death event, only maturity or surrender. Where a death does end a life policy, the value used is “its surrender value immediately before death” (IPTM3515). Any extra life cover the insurer pays is left out of the gain.

How the gain is measured

On a final event (full surrender, maturity, death or assignment for value) HMRC puts it in one sentence: “The gain is equal to the excess of the total policy benefits received during the life of the policy over premiums paid, less any earlier policy gains” (IPTM3500; the statutory calculation is in s.491). Written as a formula:

Gain = (final value + every earlier withdrawal) minus (all premiums paid + all earlier chargeable event gains)

The final value is the surrender proceeds, the maturity value, the surrender value immediately before death or, on an assignment for value, the consideration received. Between connected persons HMRC substitutes the market value (IPTM3515). The earlier withdrawals include the 5% withdrawals that were not taxed when you took them. They come back in at this point, which is why they are called tax-deferred. The earlier gains are any excess-event gains or personal portfolio bond gains already taxed, so nothing is taxed twice.

In the first two columns the 5% withdrawals have postponed tax without removing any of it. The third column shows what goes wrong. A large part surrender in year two was taxed on £800,000 when the bond had grown by £40,000, and the final figure is negative, usable only through deficiency relief. The segment route that avoids this is set out in the 5% withdrawal allowance.

A final-event gain arises on the date of the event. An excess-event gain is treated as arising at the end of the insurance year in which the withdrawal was taken, not on the day the money was paid: HMRC's example is a part surrender on 1 April 2020 in an insurance year ending 31 May 2020, which falls into 2020/21 (IPTM3505). The insurer must send you a chargeable event certificate within three months of the event (ICTA 1988 s.552), and a gain on a foreign policy goes on the SA106 foreign pages of your return (HS321).

How the gain is taxed

For an individual, a chargeable event gain is savings income (ITA 2007 s.18(4)). It sits on top of your other income for the tax year and is charged at the savings rates. Capital gains tax plays no part, so neither the 18 and 24% rates nor the £3,000 annual exempt amount helps.

Sources: gov.uk income tax rates; gov.uk tax on savings interest. Scottish rates do not apply: Scottish taxpayers pay the UK rates on savings income (gov.uk Scottish income tax). From 6 April 2027 the savings rates become 22, 42 and 47% (gov.uk policy paper; Finance Act 2026).

No 20% credit on an offshore policy

A gain on a UK policy carries a non-repayable credit at the basic rate, because the UK insurer has already paid tax on its fund (IPTM3810). A foreign policy has no such credit. HMRC's reason is that the insurer “will not have been within the 'I minus E' system” (IPTM3720). The exception is a policy issued by the UK branch of a non-UK insurer. For an additional rate taxpayer that means 45% on an offshore gain against a further 25% on a UK bond gain. That gap is what gross roll-up costs, since the offshore fund has not suffered UK tax on its income and gains along the way. From 6 April 2027 the credit on UK policies follows the new savings basic rate of 22%.

Trustees are taxed differently (discretionary trustees pay 45%, gov.uk); who pays on a bond held in trust is covered in loan trusts and discounted gift trusts.

Top-slicing relief: the method

A bond gain usually builds up over many years but is taxed in one. Top-slicing relief, in ITTOIA 2005 ss.535 to 537, corrects for that by asking what the tax would have been if you had received only one year's share of the gain. It is available to individuals only, “not ... to companies, trustees or personal representatives” (IPTM3820). You do not claim it by formula on the return: if the gain is reported, HMRC calculates the relief, and you need the number of complete years to let it do so (HS321).

1. Total liability. Work out the tax on the gain as the top slice of your income for the year, with the personal allowance, starting rate and savings allowance you actually have with the whole gain included.
2. Annual equivalent. Divide the gain by N, the number of complete years. “N cannot be reduced, in any circumstances, to less than 1” (IPTM3830). On a full surrender, death or maturity of an offshore policy N runs from the commencement of the policy, reduced by whole years of non-UK residence where time apportionment applies. On an excess event, HMRC's manual says N also runs from commencement for an offshore policy issued before 6 April 2013, and for any offshore policy where time apportionment applies, reduced by the period of residence overseas (IPTM3830). For an offshore policy issued on or after 6 April 2013 to someone who has always been UK resident, N runs from the later of commencement and the previous calculation event (IPTM3830; ITTOIA 2005 s.536). Insurers' technical guidance, including M&G's, also covers this point.
3. Relieved liability. Work out the tax on the annual equivalent alone, as the top slice of your income, and multiply by N. Since Finance Act 2020 s.37 two rules apply at this step. Reliefs and allowances are set against your other income before the slice. And the personal allowance is worked out as if the gain were only the annual equivalent. HMRC's guidance adds that the starting rate for savings and the personal savings allowance are recalculated on the same basis (IPTM3820).
4. Relief. Total liability minus relieved liability. The tax you pay on the gain is the relieved liability.

The relief helps only when the slice reaches a lower band than the full gain does. A slice of £100,000 on top of a £200,000 salary is taxed at 45% whether it is divided or not.

Worked example 1: £1,200,000 gain, £60,000 of other income

Hypothetical. A UK resident in England paid a single premium of £2,000,000 into an offshore bond. She has taken no withdrawals. In 2026/27, twelve years and two months after the policy began, she surrenders it for £3,200,000. The gain is £3,200,000 minus £2,000,000, so £1,200,000. Her other income is a £60,000 pension, all non-savings income. She has been UK resident throughout, so N is 12.

All the relief here comes from the higher rate band. Divided by 12, the gain still fills the £65,140 left in her higher rate band, but only £34,860 of each slice reaches 45% instead of £1,134,860 of the whole gain. Twelve slices use the higher rate band twelve times. The personal allowance is not restored, because £160,000 is itself above £125,140. Anyone with a large pension or salary should expect something similar. The relief is worth having but modest, and the effective rate stays above 40%.

Worked example 2: the same gain in a year with £10,000 of other income

Now suppose she surrenders the same bond in a year when her only other income is £10,000, again non-savings income. Everything else is the same.

The same bond, surrendered in the quieter year, costs £115,960 less (£505,944 minus £389,984). No slice reaches 45%, most of each slice sits in the basic and higher rate bands, and part of it is taxed at nothing. The figures were checked by script, applying allowances to other income first, then the starting rate, the savings allowance and the bands.

The Finance Act 2020 change is worth a good deal in this example. Suppose the personal allowance in the slice calculation were still based on the whole £1,200,000 gain. It would be nil, the other £10,000 would use £10,000 of the basic rate band and the starting rate would be lost. The tax on each slice would be £34,360 and the relieved liability £412,320. The rule in s.37 cuts that by £24,336. Both figures assume the slice keeps the £500 savings allowance of a higher rate taxpayer; without it the tax on each slice in the comparison would be £34,460.

The £100,000 personal allowance trap, and what changed in 2020

The whole gain counts in adjusted net income for the year, not the slice. A gain of £25,140 or more on top of £100,000 of other income therefore removes the personal allowance completely, and in the band between £100,000 and £125,140 each extra £1 of gain costs 60p before top-slicing: 40p on the pound itself and 20p because 50p of allowance disappears and is then taxed at 40%. In both examples above the allowance was lost in the real calculation, and the extra tax it caused on the other income (£5,028 and £2,000) was paid in full.

Finance Act 2020 s.37 changed how allowances work inside the top-slicing calculation. Reliefs and allowances are deducted from other income before they reach the annual equivalent, which stops them being placed where they would help most. And for the personal allowance only, the gain is treated as equal to the annual equivalent, so the allowance is worked out on your income plus one slice. HMRC's guidance describes the allowance being “recalculated based on total income in the year with only the sliced gain included” and says the starting rate and savings allowance are recalculated too (IPTM3820).

The fix is only partial. The allowance you actually lose stays lost, with the tax it causes on your other income. The relief now values the slice as if you had kept it, which is worth most when other income is modest, as example 2 shows, and nothing when other income alone is over £125,140.

Timing the gain

These steps change the rate of tax on the gain; none of them makes it disappear.

• Surrender in a low-income year. On a large bond that can be a six-figure difference, as the examples show.
• Spread the gain across tax years. Most offshore bonds are issued as many identical segments. Surrendering half the segments in one year and half in another gives two smaller slices. On the figures in example 2, a £600,000 gain from half the segments in 2026/27 would cost £125,984 in total, or 21.0%, because the slice of £50,000 fits almost entirely below the higher rate. The second half would be taxed in a later year under that year's rules, which from 6 April 2027 means savings rates of 22, 42 and 47%.
• Give segments to family members who pay less. A gift assignment is not a chargeable event. The adult child who later surrenders is taxed at their own rates. The gift is a transfer for inheritance tax purposes; see inheritance tax and succession.
• Surrender while not UK resident. A gain arising while you are not UK resident is outside UK income tax unless the temporary non-residence rules bring it back. The rules for leavers and arrivals, including time apportionment for years abroad, are in moving to, returning to or leaving the UK.

One timing rule catches people out. An excess-event gain belongs to the tax year in which the insurance year ends, which may not be the tax year in which you took the money (IPTM3505). Check the policy anniversary before assuming which year a withdrawal falls into.

Deficiency relief, briefly

There is no loss relief under the chargeable event rules: “a loss on one policy cannot be set against a gain on another” (IPTM3860). The one exception is deficiency relief. If the final calculation on a policy shows a negative figure because earlier part-surrender gains taxed more than the policy ever made, an individual can set the deficiency against income taxed at the higher rates in the year the policy ends. It does not reduce tax at the additional rate or the dividend additional rate (IPTM3880; HS321). For an additional rate taxpayer it is usually worth little, so avoiding the excess gain in the first place matters more.

For the broader comparison with holding the same investments directly, and a calculator, see tax efficiency for UK residents.

Questions about chargeable event gains and top-slicing

Sources and authorities

Read as at 23 September 2026 for the tax year 2026/27. The worked examples are hypothetical, show every step and were checked by script against the rates listed. They are not a calculation of anyone's own tax.

• ITTOIA 2005 s.465: who is liable. s.484: chargeable events. s.491: the gain on a final event. ss.535 to 537: top-slicing relief.
• Finance Act 2020 s.37: allowances in the top-slicing calculation.
• ITA 2007 s.18(4): bond gains are savings income.
• ICTA 1988 s.552: chargeable event certificates.
• HMRC Insurance Policyholder Taxation Manual: IPTM3420 and IPTM3430 (assignments), IPTM3500 (calculating gains), IPTM3505 (insurance year), IPTM3515 (death, surrender, assignment values), IPTM3720 and IPTM3810 (basic rate credit), IPTM3820 and IPTM3830 (top-slicing relief), IPTM3860 and IPTM3880 (deficiency relief).
• HS321 Gains on foreign life insurance policies (2026).
• gov.uk: income tax rates; starting rate and personal savings allowance; Scottish income tax; savings rates from 6 April 2027; trusts and income tax.
• M&G, top-slicing relief facts (insurer technical guidance, a secondary source): years for part surrenders on offshore bonds; the primary source is IPTM3830.

Last updated: 23 September 2026. Our editorial standards describe how this material is researched, checked and corrected.