Onshore Investment Bond
A UK life insurance wrapper used for tax deferral. Gains are taxed only on a chargeable event, with 5% annual withdrawals treated as return of capital and top-slicing relief available.
By Omair SaoLast reviewed — rates for the 2026/27 tax year. See how we check our figures.
How It Works
You invest a lump sum into a life insurance bond. The fund grows with 20% internal tax. You can withdraw up to 5% of the original investment per year without immediate tax. On full surrender, the gain is taxed as income with a 20% credit and top-slicing relief.
Tax Treatment
The fund pays 20% corporation tax internally. On a chargeable event, gain is taxed as income with a 20% credit. Top-slicing relief can reduce the effective rate. 5% annual withdrawals are tax-deferred.
Tax Advantages
- Tax deferral — no annual income tax or CGT while invested
- 5% annual tax-deferred withdrawals for income planning
- Top-slicing relief can significantly reduce effective tax rate
- 20% tax credit for internal tax already paid
Who Is This Suitable For?
Higher rate taxpayers wanting to defer tax until a year when they are basic rate (e.g., retirement). Also useful for trust planning.
Worked Example: £100,000 bond: deferred withdrawals and a final surrender
- 1You invest £100,000 in an onshore bond; each year you may withdraw 5% of the original sum — £5,000 — with no tax at the time, for up to 20 years.
- 2You take nothing in years one to three; the unused allowances accumulate, so in year four you withdraw £20,000 (four × £5,000) without a chargeable event.
- 3After ten years you fully surrender for £150,000, having taken £50,000 in withdrawals.
- 4The chargeable gain is £150,000 + £50,000 − £100,000 = £100,000; the life fund has already paid tax internally, so you receive a basic-rate credit.
- 5Top-slicing divides the gain by the ten complete years — a £10,000 slice — when testing how much falls into higher bands.
Result: Surrendering in a year when your other income is low, such as the first year of retirement, can keep the whole gain within the credit.
Illustrative figures using the 2026/27 rules on this page, last checked on 25 September 2026.
Advantages and Drawbacks
Advantages
- No income tax or CGT is payable year to year, so there is nothing to declare until a chargeable event.
- The 5% withdrawals are not treated as income, so they do not count towards the tests for the personal allowance taper or the High Income Child Benefit Charge.
- A bond can be assigned to a spouse, adult child or trust without a chargeable event, moving the eventual tax to a lower band.
Drawbacks
- The fund pays tax on its income and gains internally, so your CGT exempt amount and dividend allowance are wasted on those returns.
- Withdrawals above the cumulative 5% allowance are taxed as gains immediately, even if the bond is worth less than you paid.
- Charges are typically higher than a plain platform, and adviser-sold bonds may carry early exit penalties.
Notes for Limited Company Owners
Bonds appeal to directors who expect a lower income later — for instance after selling the company — because the gain can be deferred until then. A limited company can own an onshore bond, but corporate holders are taxed on annual growth under the loan relationship rules, so the deferral advantage is largely lost.
Common Mistakes
- Taking a large withdrawal across all segments instead of surrendering whole segments, which can create an artificial gain far bigger than the real profit.
- Treating the 5% allowance as tax-free rather than tax-deferred; every withdrawal is added back on final surrender.
- Surrendering in a high-income year when waiting would have cut the effective tax.
Who Should Avoid It
Anyone with unused ISA allowance, CGT exemption or pension allowance, and basic-rate taxpayers likely to stay basic rate, for whom the wrapper adds cost without much benefit.
Official Sources
The rules on this page come from the following official pages and were checked on 25 September 2026. Read how we check our figures.
Related Calculators
Frequently Asked Questions
When should I cash in?
Ideally when your income is lower (e.g., retirement). Top-slicing helps, but cashing in as a basic rate taxpayer means the 20% credit covers most of the tax.
How does the 5% rule work?
Withdraw up to 5% of original investment per year tax-deferred. Unused allowance rolls forward — after 20 years you can withdraw 100% of original investment tax-deferred.
Can I assign the bond?
Yes. Assignment is generally not a chargeable event, useful for transferring to a lower-rate taxpayer spouse before encashment.