Class 2 NICs computation issues – Fix now not expected until September

HMRC have shared a update in today’s Agent Update 133 relating to a computational issue affecting Class 2 National Insurance contributions (NICs) in the tax year 2024/25 – see our previous news article about this.  It was hoped that a fix would be implemented by the end of July. However, this is taking longer than HMRC anticipated and they now expect this to be resolved by the end of September 2025. Unfortunately, this also means that incorrect Class 2 NIC letters will continue to be sent until this date. The full text of HMRC’s update is provided below.

Self Assessment Class 2 National Insurance contributions

We’re working to resolve an issue affecting some Self Assessment taxpayers in relation to Class 2 National Insurance contributions (NICs) for the last tax year.

The nature of the error depends on individual circumstances, but some customers with self-employed profits above £12,570 have seen a Class 2 NICs charge of £358.80 added to their accounts when they shouldn’t have been. In some circumstances it will be less.

We’ve taken action to correct the Class 2 NICs figure where the information we hold has allowed us. If this applies to your clients, they will have received a message to let them know.

We will correct the records of other customers after the issue has been resolved and notify them when we have done so. Customers will be issued with a new SA302 tax calculation after their record has been corrected with a new 30-day limit.

Some customers have reported receiving a letter ‘correcting’ their NICs figure to the initial (correct) figure submitted in the tax return. In these circumstances the customer will not receive a further SA302 as the information held on record is correct.

Unfortunately, incorrect Class 2 NICs letters will continue to be issued until the IT problem is resolved in September. We will be correcting records before any incorrect amounts due affect the tax owed for 2024 to 2025. 

We are sorry for the inconvenience that this issue has caused. While we understand this may be concerning there should be no long-term impact. Customers who may have made a payment will either be refunded or have a credit added to their Self Assessment statement.