Beta This part of GOV.UK is being rebuilt – find out what beta means

HMRC internal manual

Employment Income Manual

Termination payments and benefits: example: Section 401 ITEPA 2003: payment or benefit received after termination

The delay is irrelevant as far as the question of whether the payment is within the scope of Section 401 ITEPA 2003 is concerned.

The £20,000 is still in connection with the termination and so falls within the Section.

Note: see EIM13100 for the tax year for which a payment or benefit is assessed.