The policy would raise an estimated £4.7 billion in 2029/30 and £2.6 billion in 2030/31, an Office for Budget Responsibility document said.

Salary-sacrificed pension contributions above an annual £2,000 threshold will no longer be exempt from national insurance from April 2029, according to a document published in “error” ahead of the Budget.

The Office for Budget Responsibility (OBR) document said that salary-sacrificed pension contributions above £2,000 would be treated as ordinary employee pension contributions in the tax system and therefore be subject to both employer and employee national insurance contributions.

The document said: “The policy results in an increase in NICs (national insurance contributions) which is estimated to raise £4.7 billion in 2029/30 and £2.6 billion in 2

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