If you’re employed by somebody, you’ll start paying NI when you’re earning just under £10,000 a year.
Unlike the rate of income tax, which rises once you reach earnings of about £50,000, National Insurance falls at that point.
That means an increase would have a proportionally smaller impact on the highest earners.
It has been reported that there are plans to increase the rate of NI contributions to help pay for the social care for the elderly which has been widely criticised, including from within the Conservative Party.
It has been argued it would be unfair on younger people and other taxes might be more suitable.
BBC Breakfast airs daily on BBC One at 6am.