Complete years (N) in top-slicing: full surrender vs excess event

N is the number of complete years that divides the gain into the slice. One year either way can move the relief. The rule for fixing N turns on the event: a full surrender counts from when the policy began. A part-surrender excess event usually counts from the last excess event.

The two cases

On a final chargeable event — a full surrender, maturity or death — N is the number of complete years the policy has run since it started (counted from the earliest related policy where the bond replaced an earlier one, s.536(4); reduced only where time-apportionment applies, s.536(7)). The £60,000 gain before any TAR in our worked offshore case ran six complete years, so N = 6 and the slice is £10,000.

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.

On a part-surrender or part-assignment excess event — a withdrawal above the cumulative 5% allowance — N for a UK policy, and for an offshore policy issued on or after 6 April 2013 to an always-UK-resident policyholder, is counted to the end of the insurance year in which the event falls, from the start of the policy or from the end of the insurance year of the previous excess event, whichever is later (ITTOIA 2005 s.536(2)). So each excess event normally restarts the clock, and a bond that has thrown off earlier excess gains carries a shorter N, and a larger slice, than its age alone suggests. Two exceptions count from commencement instead: an offshore policy issued before 6 April 2013 (unless on or after that date it was varied to increase its benefits (exercising a right counts), assigned to the client or into or out of a trust (HMRC IPTM3731 counts both), or used as security for the client’s debt (FA 2013 Sch 8 para 7(2)-(3)), when it counts from the previous excess event as above), and any policy where time-apportionment applies because the policyholder was non-UK resident for a period (N is then reduced by that period; IPTM3830). On a UK policy, using the full age over-states N and under-states the slice; on a pre-2013 offshore bond that has had no such event, the full age is the right answer.

The same-tax-year flag — and why it does not change N

On a final event, N is the number of complete 12-month periods from when the policy started to the event date — plain date arithmetic (IPTM7560, verbatim: "the number of complete years (periods of 12 months, not insurance years)"). A part-surrender or part-assignment event counts its years to the end of its insurance year instead, as above. Where a final chargeable event — a full surrender, death or maturity — falls in the same tax year as the most recent policy anniversary, ITTOIA 2005 s.499(5) merges the final insurance year with the previous one. That is real, but it feeds a different calculation entirely — the part-surrender machinery: because the merged year is the final insurance year, a part surrender in it does not produce its own excess event (s.509(5)) and is swept into the final gain instead — not the final event’s N, which stays the complete 12-month periods to the event date. The calculator still surfaces this as a flag so you can verify the dates against the provider certificate; the flag never changes N.

Because N depends on the event type, the dates and the policy's history of earlier gains, it's the figure most worth confirming on the top-slicing relief calculator, which shows N and the slice explicitly; the gain and the 5% allowance position come from the chargeable event gain calculator. For the full five-step computation that uses N, see how to calculate top-slicing relief, and for the 5% allowance itself, part surrender vs segment surrender.

IPTM7560 (number of complete years) · ITTOIA 2005 s.536 (N, including (2) calculation events, (4) related policies and (7) foreign days) · IPTM3830 and FA 2013 Sch 8 para 7(2)-(3) (pre-6 April 2013 offshore policies and the exception ; TAR) · ITTOIA 2005 s.499(5) (same-tax-year insurance-year merge)