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← Calculators/Tax year 2026/27·Last reviewed

Chargeable event gain calculator

Gain, slice and the 5% allowance position from the certificate figures — plus a three-route withdrawal comparator and a segment optimiser.

Free, no sign-up. Runs the same engine and the same versioned tax-year config the signed-in suite uses — nothing leaves your browser. How we verify the numbers.

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— How it's calculated

The gain on full surrender

On a full surrender the chargeable event gain is the surrender value, plus all withdrawals previously taken, minus total premiums paid and minus any gains already taxed on earlier excess events. A negative result is a deficiency, not a gain — deficiency relief may apply instead.

IPTM3505 (full surrender) · ITTOIA 2005 s.491

The 5% tax-deferred allowance

Each policy year you may withdraw 5% of the premiums paid without an immediate chargeable event — unused allowance accumulates, and the pool caps once cumulative allowances reach 100% of premiums (the 20-year point). Withdrawals beyond the cumulative allowance trigger an excess event taxed in that year. The allowance defers tax; it does not remove it — everything washes through the final surrender computation.

IPTM3540 (part surrenders, the 5% allowance) · ITTOIA 2005 s.507

Segment surrender

Most bonds are written as a cluster of identical mini-policies (commonly 100 or 1,000). Surrendering K whole segments crystallises K/N of the total gain as a final event on those segments — often cheaper than a part-surrender excess for the same cash, and the comparator above prices all three routes side by side.

IPTM3520 (segment surrender as separate policies)

— Worked example

Full surrender · £150,000 surrender value · £100,000 premiums · 6 complete years
Gain (surrender + withdrawals − premiums − previous gains)
£50,000
Annual equivalent / slice (gain ÷ 6)
£8,333.33
Cumulative 5% tax-deferred allowance (5% × 6 years)
£30,000
Allowance remaining (nothing withdrawn)
£30,000

Computed live by the same engine the tool above runs. The slice is the figure top-slicing relief works on — take it to the top-slicing relief calculator for the five-step computation.

— Related

— When you're ready

Save the calc to a client and get the branded compliance PDF — full working, legislative references, config version, sign-off trail.

3 free calcs / month · no card required · cancel any time.

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