IPTM3830 - Top slicing relief: calculation
Source: gov.uk (2025-09-26)


The key to the calculation is to determine a fraction of the gain, or aggregated gains, by dividing it by ‘N’, where this is the number of complete years, ending with the date of the chargeable event and starting with a date determined as set out below.

Changes to the time apportioned reduction rules (see IPTM3731 (https://www.gov.uk/hmrc-internal-manuals/insurance-policyholder-taxation-manual/iptm3731)), to reflect the introduction of the statutory residence test, apply to all policies where the gain arises on or after 6 April 2013. This will affect the period used for N.

N cannot be reduced, in any circumstances, to less than 1.

No top slicing relief is available for the annual gains that arise on ‘personal portfolio bond events’. Where such a gain arises, the ‘number of complete years’ entered on the tax return should be 1 to ensure that in practice no top slicing relief is given on the gain. This is the figure that should have been shown by the insurer on the chargeable event certificate – see IPTM7165 (https://www.gov.uk/hmrc-internal-manuals/insurance-policyholder-taxation-manual/iptm7165) and IPTM7130 (https://www.gov.uk/hmrc-internal-manuals/insurance-policyholder-taxation-manual/iptm7130).

Calculation events (other than personal portfolio bond events)

For definitions of 'calculation events' and 'personal portfolio bond events' see IPTM3555 (https://www.gov.uk/hmrc-internal-manuals/insurance-policyholder-taxation-manual/iptm3555).

UK Policies

Pre 6 April 2013 policies:
- The starting point for determining N is the later of commencement or the date of the last calculation event (other than a personal portfolio bond event).
Policies issued on or after 6 April 2013:
- Where the policyholder has always been UK resident, time apportionment reduction (TAR) will not apply. The period for N is the later of commencement or the last calculation event (other than a personal portfolio bond event).
- Where the policyholder has a period of non-residence, TAR will apply. The period for N starts from commencement of the policy and is reduced by any period of residence overseas.
Offshore Policies

Pre 6 April 2013 policies:
- The starting point for determining N is the commencement of the policy. Where TAR applies, N is reduced by the number of complete years during which the policyholder was non-UK resident.
Policies issued on or after 6 April 2013:
- Where the policyholder has always been UK resident, time apportionment reduction (TAR) will not apply. The period for N is the later of commencement or the last calculation event (other than a personal portfolio bond event).
- Where the policyholder has a period of non-residence, TAR will apply. The period for N starts from commencement of the policy and is reduced by any period of residence overseas.
Example 1

Orla purchased a life insurance policy from a UK insurer on 1 April 2014 when she was UK resident. From 1 April 2015 Orla was resident for tax purposes in the Republic of Ireland before returning permanently to the UK on 31 March 2017.

On 1 August 2018, Orla partially surrendered her policy and incurred a chargeable event gain. The gain will be deemed to have occurred at the end of the relevant insurance year, in this case 31 March 2019.

The period for N starts from the commencement of the policy less any period of non-residence. N is therefore the 5 years from commencement of the policy less the 2 year period of non-residence.

Final events: death, maturity and full surrenders

Where the event in question is a final event, where the whole of the rights under the policy or contract are surrendered, N is calculated as follows:

UK Policies

Pre 6 April 2013 policies:
- Where the event is a final event such as full surrender, maturity or death, the starting point for determining N is the commencement date of the policy.
Policies issued on or after 6 April 2013:
- The starting point for determining N is the commencement date of the policy, but where TAR applies, N is reduced by any period of residence overseas.
Offshore Policies

For all policies, the starting point for determining N is the commencement date of the policy, but where TAR applies, N is reduced by any period of residence overseas.

Example 2

The relevant facts are as in Example 1.

Orla has continued to reside permanently in the UK since 31 March 2017. Orla surrenders her life insurance policy in full on 31 March 2022.

As this is a final event, the period for N starts from commencement of the policy, less any period of non-residence. N is therefore the 8 years since commencement of the policy less the 2 year period of non-residence.

Basic rate tax treated as paid – Offshore policies

Foreign policies do not attract a credit for tax treated as paid (see IPTM3720 (https://www.gov.uk/hmrc-internal-manuals/insurance-policyholder-taxation-manual/iptm3720)). However, for the purposes of calculating top slicing relief basic rate tax treated as paid is deducted from both the total liability and total relieved liability within the calculation (see IPTM3840 (https://www.gov.uk/hmrc-internal-manuals/insurance-policyholder-taxation-manual/iptm3840)). This ensures that the relief is calculated in the same way for all policyholders, regardless of whether the policy is a ‘UK’ policy or ‘foreign’ policy. IPTM3850 (https://www.gov.uk/hmrc-internal-manuals/insurance-policyholder-taxation-manual/iptm3850) sets out examples of how this works in practice.