Do I report a chargeable event gain, or does the insurance company?

The insurer issues the chargeable event certificate and, above a size threshold, notifies HMRC — but it does not pay the tax. The person liable for the gain (usually the bondholder, or the trustees/personal representatives) reports it on their tax return.

Do I pay tax on the gain if the bond is onshore?

An onshore bond carries a notional 20% tax credit (ITTOIA 2005 s.530), so a basic-rate taxpayer usually has no more to pay. Higher- and additional-rate taxpayers pay the excess over 20%, after top-slicing relief. Offshore bonds carry no credit.

Does a bond gain mean I have to file a self-assessment return?

If the gain (or the additional tax it creates) leaves tax that PAYE didn’t collect, a self-assessment return is due. A basic-rate taxpayer with only an onshore gain often has nothing further to pay and may not need to file.

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Reporting a chargeable event gain to HMRC

The insurer issues a certificate; the individual reports the gain. Where it goes on the return, what the onshore notional credit does, and when a gain forces you to file.

5 min read · Last reviewed 16 Jun 2026

When a UK investment bond produces a chargeable event gain, the insurer issues a chargeable event certificate; the individual liable for the gain reports it to HMRC. It goes on the self-assessment return — the gain, the number of complete years, and, for an onshore bond, the notional 20% tax already treated as paid.

Who reports, and where

The insurer's duty is to certify the gain (ITTOIA 2005 s.552) and, above a size threshold, to notify HMRC. It does not pay the tax. The person liable — usually the individual who owns the bond, or the trustees/personal representatives where a trust or estate holds it — reports the gain. For an individual that means the additional-information pages of the tax return (SA101), entering the gain, the number of complete years the policy ran, and the notional tax treated as paid on an onshore bond.

A gain can pull someone into self-assessment who wasn't otherwise in it: if the gain (or the extra tax it triggers) means there's tax to pay that PAYE didn't collect, a return is due. HMRC's helpsheet HS320 walks the individual through the entries.

The onshore notional credit

Here's the part DIY reporting most often fumbles. On an onshore (UK) bond, the life office has paid tax within the fund, so the gain carries a notional basic-rate (20%) tax credit under ITTOIA 2005 s.530 — treated as already paid, and not repayable. A basic-rate taxpayer typically has no further tax to pay; a higher- or additional-rate taxpayer pays the difference between their rate and 20%, after top-slicing relief. An offshorebond carries no such credit, so the whole gain is taxable at the individual's rates (again, after top-slicing relief).

What a reported gain looks like — onshore vs offshore (illustrative, IPTM-EX-03 figures)

Chargeable gain reported: £60,000
Complete years (N): 6
Annual equivalent (the slice): £10,000
Onshore: notional 20% credit treated as paid: yes (s.530)
Offshore: notional credit: none

Two errors recur: taking the certificate's gain straight to a tax figure without top-slicing relief — throwing away the relief the regime is built around — and, on an onshore bond, forgetting the notional credit and over-paying. Confirm the gain and the slice on the chargeable event gain calculator, then run the five-step relief on the top-slicing relief calculator — which carries the onshore credit through and, signed in, prints the working to a compliance-annex PDF for the client file. If you're still decoding the certificate itself, see how to read a chargeable event certificate.

ITTOIA 2005 s.552 (certificate) · IPTM3505 (the gain) · ITTOIA 2005 s.530 (onshore credit) · IPTM7300+ / HS320 (reporting)

Common questions

Do I report a chargeable event gain, or does the insurance company?: The insurer issues the chargeable event certificate and, above a size threshold, notifies HMRC — but it does not pay the tax. The person liable for the gain (usually the bondholder, or the trustees/personal representatives) reports it on their tax return.
Where does a chargeable event gain go on the tax return?: For an individual, on the additional-information pages (SA101): the gain, the number of complete years the policy ran, and the notional tax treated as paid for an onshore bond. HMRC’s helpsheet HS320 sets out the entries.
Do I pay tax on the gain if the bond is onshore?: An onshore bond carries a notional 20% tax credit (ITTOIA 2005 s.530), so a basic-rate taxpayer usually has no more to pay. Higher- and additional-rate taxpayers pay the excess over 20%, after top-slicing relief. Offshore bonds carry no credit.
Does a bond gain mean I have to file a self-assessment return?: If the gain (or the additional tax it creates) leaves tax that PAYE didn’t collect, a self-assessment return is due. A basic-rate taxpayer with only an onshore gain often has nothing further to pay and may not need to file.

Sources & grounding

Process basis: HMRC IPTM3505 (the gain), ITTOIA 2005 s.552 (the insurer’s certificate obligation), IPTM7300 onwards (reporting of chargeable event gains), HS320 (HMRC’s Gains on UK life insurance policies helpsheet).
Onshore notional credit: ITTOIA 2005 s.530 — a basic-rate (20%) tax credit treated as paid on an onshore (UK) bond gain; offshore gains carry no such credit. The credit is not repayable.
Illustrative gain figure (£60,000 over 6 complete years → £10,000 annual equivalent): the engine’s IPTM-EX-03-OFFSHORE anchor, re-used purely to show where a reported gain and its slice sit; the reporting steps themselves are procedural.

For planning and illustration purposes only. Verify all inputs against source documents. This explainer does not constitute financial or tax advice.