NIM07070 | Class 1 NICs: Payments made under employment legislation: Re-allocating primary NICs paid on a payment made under a reinstatement order, a re-engagement order, an order for the continuation of a contract of employment or a protective award:
From HM Revenue & Customs · National Insurance Manual
How to apportion the amount of NICs paid between tax years: Information required
As explained in NIM07066, an employee who has paid NICs on a payment made under:
may request that those NICs are treated as paid in an earlier tax year to the one in which the NICs were actually paid if this will protect or enhance their benefit/pension position for the earlier year.
In order to apportion the amount of primary NICs paid, you will need the following information:
the total amount of primary NICs paid in the relevant tax years on earnings paid by the employer who made the payment
the amount of the payment
the period to which payment relates
the relevant earnings limits and, if appropriate, earnings threshold. The example in NIM07071 gives guidance on how to calculate these limits and thresholds.