The amount of National Insurance (NI) paid by employers goes up on 6 April ... and is paid on earnings between £50,271 and £125,140. Once you earn more than £100,000, you also start losing ...

This equates to about £11,500 a year. It costs £907 to buy a full year of NI contributions and this will be less if you worked for some part of that year, so the potential return on investment is huge ...