What is a chargeable event on an investment bond and how is it taxed?

Full answer

Investment bonds (onshore UK and offshore) are life-insurance-wrapped investments taxed under special chargeable-event rules rather than capital gains tax. A chargeable event is the moment a taxable gain is calculated. The main triggers are full surrender of the bond, death of the life assured, assignment of the bond for money or money's worth, and partial withdrawals that exceed the cumulative 5% tax-deferred allowance. That 5% rule lets you withdraw up to 5% of your original investment each policy year for 20 years with no immediate tax, with any unused allowance carried forward; only withdrawals above the running 5% limit create a chargeable gain. When a chargeable event occurs, the gain is treated as savings income and added to your other income for the tax year. For an onshore UK bond, the insurer has already paid tax within the fund, so the gain comes with a notional 20% basic-rate tax credit - you only pay more if the gain pushes you into higher (40%) or additional (45%) rate territory, and basic-rate taxpayers usually have nothing further to pay. Offshore bonds have no such credit, so the whole gain is taxable. Top-slicing relief can soften the blow: you divide the gain by the number of complete years the bond was held to find the annualised slice, test that against the tax bands, and may avoid being pushed unfairly into a higher band by a one-off large gain. Be aware a large chargeable gain can also reduce your personal allowance, which tapers above GBP 100,000 and disappears at GBP 125,140 (the 60% effective band). Because the calculation depends on your other income and the gain size, model your income tax position with an income tax calculator before surrendering, and consider spreading surrenders across tax years.

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