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Part surrender vs segment surrender: same cash, different tax
One withdrawal, two mechanisms, two answers. The route is chosen by instruction before the money moves — and the default is often the expensive one.
Based on HMRC’s Insurance Policyholder Taxation Manual (IPTM3520, IPTM3540, IPTM3560).
6 min read · Last reviewed
— In short
A part surrender takes the cash proportionately across every segment and is measured against the cumulative 5% allowance, so any excess over that allowance is a chargeable gain regardless of investment performance. A segment surrender fully surrenders whole segments, each a final event on a separate policy, so the gain is that segment's share of actual growth, value minus premiums. Identical cash can therefore carry very different tax, and the route is fixed by the instruction before the money moves.
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Most investment bonds are written as a cluster of identical mini-policies — segments — commonly 100 or 1,000 of them. That structure gives every withdrawal two legal routes, taxed by entirely different rules. A part surrender takes the cash proportionately across all segments and is measured against the cumulative 5% allowance (IPTM3540). Draw more than the allowance and the excess is a chargeable gain, whatever the bond has actually done. A segment surrenderfully surrenders a chosen number of whole segments — call it K — (IPTM3520): each is a final event on a separate policy, so the gain is that segment's share of actual growth, value minus premiums.
The same £30,000, both ways
- Part surrender — chargeable gain (before any TAR)
- £15,000
- Part surrender — tax due
- £2,900
- Part surrender — net cash
- £27,100
- Segment surrender (32 segments) — cash raised
- £30,400
- Segment surrender — chargeable gain (before any TAR)
- £0
- Segment surrender — tax due
- £0
Worked-example basis: No time-apportioned reduction is due for any gain or policy shown. TAR is not calculated or applied. Raw gains are shown before any TAR.
The bond is worth less than was paid in, so each segment's final-event gain is nil. The segment route raises the cash with no chargeable event gain at all. The part-surrender route manufactures a £15,000 gain before any TAR because it measures against the allowance, not the investment. Same client, same bond, same need — the £2,900 is purely the mechanism.
IPTM3520 · IPTM3540 — figures engine-computed, 2026/27 config
Which route wins is case-specific
Segments don't always win. On a bond standing at a large gain, a segment surrender crystallises real growth now, whereas a withdrawal inside the unused 5% pool defers tax entirely — there the part surrender is the quiet route. What decides it is the bond's gain position, the unused allowance, the client's marginal band this year, and how many complete years have run, since more years means bigger slice relief. Neither route is better in the abstract. They differ, and the difference is knowable before the instruction is sent.
The common error: the default form
Provider withdrawal forms commonly default to a part surrender across all segments. A request phrased as “please send £30,000” gets processed that way, and the chargeable event certificate arrives months later, once the tax year has crystallised. The shape of the instruction makes the election, before payment — so the comparison has to happen at the point of request, in writing. The chargeable event gain calculator prices all three routes (full surrender, part surrender, K segments) on your figures and flags the cheapest.
A hybrid is often optimal in practice: whole segments for the bulk + a part surrender within the remaining 5% pool for the balance.
Sources & grounding
Worked figures (partial: gain before any TAR £15,000/tax £2,900/net £27,100 · segments: 32 of 100, £30,400 raised, gain before any TAR £0, tax £0 · engine ranks segment route cheapest): RE-GROUNDED 2026-08-12 by re-running the production engine (compareWithdrawalScenarios, scripts/ground-phase-c.mts) after ADR-072 corrected the real-main highest-part calculation. Inputs unchanged — same case as the 5%-trap article. No time-apportioned reduction is due; TAR is not calculated or applied.
Rule basis: IPTM3540/3560 (part surrender, excess over cumulative 5%), IPTM3520 (segment surrender = full surrender of separate policies, gain on actual performance).
For planning and illustration purposes only. Verify all inputs against source documents. This explainer does not constitute financial or tax advice.
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