Where an employee has entered into an agreement with the
employer to pay the employer’s (secondary) NICs, or a joint
NICs election under which the employer’s NICs is transferred
to the employee, the amount of employer’s NICs is a
deductible amount – see ITEPA03/S481.
It is only deductible in computing the Income Tax liability,
not that for NIC.
Where the employer’s NICs is transferred under an agreement, the deductible amount is the amount of employer’s NICs that the employer received from the employee on or before 5 June in the tax year following that in which the gain is realised.
Where a joint election is entered into, the deductible amount is the NICs actually paid by the employee.
If the approval of the joint election is withdrawn, the
deductible amount is limited to the amount of the liability met
before 5 June in the tax year following that in which the gain is
realised. “Approval” means approval by HMRC under
paragraph 3B of Schedule 1 to the Social Security Contributions and
Benefits Act 1992.
There are separate provisions that apply where a Special
Contribution under section 2(1)(a) Social Security Contributions
(Share Options) Act 2001 has replaced the liability to pay Class 1
NICs – see
ERSM110530.